Productive Performance of the Lake Victoria Fishing FleetThis project aims at determining the variations in the productive performance of the Lake Victoria fishing fleet in the three countries riparian to Lake Victoria. The project will therefore seek to explore and investigate the following: i. To examine and compare the productive efficiency of the Lake Victoria fishing fleet in the riparian countries of Kenya, Tanzania and Uganda. ii. To assess changes in fisheries productivity using Fisher’s knowledge and perception towards catch. iii. To determine how the different ecosystem and management factors affect the lake’s fisheries productivity. United National University-Fisheries Training Program (UNU-FTP)Regional20202020
Ocean Acidification Observation in Tanzanian Coastal WatersMASMANational20192020
Economic and Financial Impact Assesment of Lake Victoria FisheriesThe study conducted between February and March 2018 to generate economic and financial information on the Lake Victoria fisheries revealed that fishing enterprises using destructive fishing gears such as beach seine and monofilament nets are profitable and this explains why their elimination has been unsuccessful. In addition, the studz did reveal that income earned by fishers per month is slightly higher than the minimum monthly pay for private and public employee.European UnionRegional20182018
Research on small pelagic fishery in the Tanzanian mainlandThe aim of this project is to conduct a detailed analysis of the small pelagic fisheries in mainland Tanzania in order to understand the status of the fisheries for management and sustainable utilization of the resource. This will be achieved by conducting acoustic surveys in designated tracks from the low tide baseline up to 12 nm along the major fishing grounds including Rufiji delta, Zanzibar channel and Tanga. In addition, artisanal fishery surveys will be conducted in selected small pelagic fishing grounds. The stock assessment will provide information on the status of the fisheries stocks in term of diversity, abundance, distribution and other biological and environmental parameters. Furthermore, the artisanal fishery surveys will provide information on what species are actually caught, fisheries characteristics, trends in catch and distribution of small pelagic fisheries. The stock assessment and artisanal surveys will generate findings that will facilitate sustainable management measures of the fisheries resources and recommendations for policy formulation in the region.World BankNational20182020
Morphological identification for the Clupeidae and Engraulidae along the marine coastal waters of Tanzania: Taxonomic review and guidance for scientists and decision makers.Catches of anchovies and sardines (families Engraulidae and Clupeidae) occupy the second and third places worldwide, supplying the global human population with abundant and high-quality animal protein. Individuals of these small pelagic species are distributed globally in shallow marine waters usually not surpassing 50 m deep. They migrate vertically through the water columns with various salinities, including estuarine. Species of these families are filter-feeders, mostly feeding on planktons, and consequently their trophic levels are low. The Engraulidae comprises one hundred and forty four species in twenty one genera, of which nine species in four genera occur along the marine coastal waters of Tanzania, whereas among two hundred and fourteen species in sixty five genera are currently placed in the Clupeidae family, however, fourteen species in eight genera are present along the Tanzanian coast. Species belonging to especially Engraulidae family have long been confused taxonomically due to similar body morphologies and overlapping meristic characters. Therefore, the present study makes available taxonomic information, however, extensive study and fine scale analysis such as applied comprehensive alpha-taxonomy coupled with both beta and gama taxonomy need to be conducted to provide proper identification that will provide a massive information on species biodiversity. Properly identified, described and well interpreted species will provide important base line information for designing management programmes. WIOMSA20182019
How Natural Variability Affects Risk Preferences and Cooperation among Common-pool Resources UsersThe multi-year NATCOOP research project studies governance solutions for Lake Victoria fisheries and aims to understand how natural variability affects risk preferences and cooperation among common-pool resource users. Researchers from Heidelberg University and the University of Dar es Salaam with local scientists from TAFIRI have collaborated since 2017 to find solutions to the social dilemma of resource governance at Lake Victoria. ERCNational20172020
Artisanal fishery of rays fish in relation to local livelihoods - in Mafia District, TanzaniaThis project had been set up following the decline in ray fish catch landings in Mafia Island compared to other fish landing sites along the coast of Tanzania. The island’s economy is heavily dependent on fishing because other sources of income are restricted. Agriculture, for example, is limited by poor soil and low capital investment, while Mafia’s isolation hinders the development of business enterprises. Recent population growth in the island, together with increase in the number of migrant artisanal fishers, have boosted the demand for marine resources including ray fishes. Rays are particularly vulnerable, as they are targeted for sun-dried fillets (ng’onda) by impoverished coastal communities in Mafia. Reductions in annual ray catch landings, as reported by the Tanzanian Fisheries Division between 2007 and 2015, had given rise to fears that ray stocks are being overfished as a result of increased fishing effort targeting these species. Therefore, an urgent investigation was required to understand the current status of the catch landings, provide species – specific data information and suggest legal binding operational fisheries management to avoid overfishing and ensure fisheries sustainability and food security. To achieve this, total catch landings, biometric and fishery specific information data were collected from local fishermen at fish landing sites. Social demographic data by conducting a questionnaire survey and semi-structured interviews was also conducted to investigate how ray fish fishery supports the livelihoods of the local people in Mafia District: Thus, what was the participation of different social groups (in terms of gender, age and ethnicity) in rays’ fishery in Mafia Island? What was the influence of market and norms?. https://saveourseas.com/update/whats-going-on-with-the-whiprays-of-mafia-island/. https://saveourseas.com/update/patrobas-project-wrap-up/. https://www.saveourseasmagazine.com/a-short-interview-with-patroba-matiku/. SOSF - SWITZERLANDNational20172018
A new species and new records of goatfishes of the genus Parupeneus (Mullidae) from the Indian Ocean, with updated occurrence information for P. jansenii in the Western PacificGoatfishes of the genus Parupeneus (Mullidae), from several areas and countries of the Indo West Pacific, were studied, focusing on species characterized by a symmetrically rounded rear end of the maxilla, which belong to the so called heptacanthus group. We examined 62 meristic and morphometric characters and colour patterns from 180 specimens from 11 Parupeneus species, using a comprehensive alpha-taxonomy approach. When possible, the data for species represented by wider size ranges were split into two size classes (small sized fish, less than 110 mm SL, vs. large sized fish greater than or equals 110 mm SL) to account for allometric changes in body form. A new species, P. inayatae Uiblein & Fahmi, is described, based on a specimen collected in SW Lom bok, Indonesia, and new records for four species are reported from the Indian Ocean: Parupeneus fraserorum new for Mozambique, P. jansenii new for Myanmar and the NE Indian Ocean, P. nansen new for Tanzania, and P. procerigena new for the Nazareth Bank and Mauritus (Cargados Carajos Bank), Western Indian Ocean (WIO). The record of P. jansenii for Myanmar was compared in detail to 37 conspecific specimens from the entire distribution range (western Indonesia to Japan and Vietnam to NE Australia). The latter revealed two new Pacific records for the Central Philippines and for Shikoku Island, Japan (northernmost record of the species). For each of the eight heptacanthus group species, diagnoses are provided along with remarks on intraspecific size- and or population related variation and or other noteworthy observations. The new species can be distinguished from all other 32 congeners as follows: dorsal head margin in front of eyes concave shaped; posterior maxilla margin evenly, symmetrically rounded; body, head, and caudal peduncle moderately deep; pectoral and pelvic fins subequal in length; and caudal peduncle clearly deeper than 9.5 % SL; in life a dusky spot on lateral line below interdorsal space.IMRRegional20162018
Illegal, Unreported and Unregulated Fishing as a Governability Problem: A Case Study of Lake Victoria, TanzaniaThe study employed interactive governance theory and governabilty assessment framework to examine whether the persistent IUU fishing in Lake Victoria is a governability problem. The study revealed that the persistent IUU fishing is a ´Wicked´ problem that do not require the usual technical management fixes to tackle, but rather a better understanding of the complexity, diversity and dynamics and scale issues inherent in the smal-scale fisheries.SSHRCNational20152016
Strong fisheries management and governance positively impact ecosystem statusFisheries have had major negative impacts on marine ecosystems, and effective fisheries management and governance are needed to achieve sustainable fisheries, biodiversity conservation goals and thus good ecosystem status. To date, the IndiSeas programme (Indicators for the Seas) has focussed on assessing the ecological impacts of fishing at the ecosystem scale using ecological indicators. Here, we explore fisheries ‘Management Effectiveness’ and ‘Governance Quality’ and relate this to ecosystem health and status. We developed a dedicated expert survey, focused at the ecosystem level, with a series of questions addressing aspects of management and governance, from an ecosystem based perspective, using objective and evidence based criteria. The survey was completed by ecosystem experts (managers and scientists) and results analysed using ranking and multivariate methods. Results were further examined for selected ecosystems, using expert knowledge, to explore the overall findings in greater depth. Higher scores for ‘Management Effectiveness’ and ‘Governance Quality’ were significantly and positively related to ecosystems with better ecological status. Key factors that point to success in delivering fisheries and conservation objectives were as follows: the use of reference points for management, frequent review of stock assessments, whether Illegal, Unreported and Unregulated (IUU) catches were being accounted for and addressed, and the inclusion of stakeholders. Additionally, we found that the implementation of a long term management plan, including economic and social dimensions of fisheries in exploited ecosystems, was a key factor in successful, sustainable fisheries management. Our results support the thesis that good ecosystem based management and governance, sustainable fisheries and healthy ecosystems go together.INDISEASRegional20152016
Social–Ecological Studies to Sustain FisheriesThe key rationale behind sustainability science is to understand the relationships between nature and human society to foster solutions to problems in the two components. Both natural and human drivers, and their interactions are known to cause pressures on marine ecosystems. The study is carried out in Akkeshi and Erimo in eastern Hokkaido, Japan. Fishers in these areas engage in a variety of fisheries and catch wide ranges of marine living species; about 40 and 20 species are landed in Akkeshi and Erimo, respectively. This work endeavored to fill in the knowledge gap on social–ecological systems, and foster future research directions, and facilitate formulation of sustainable fisheries management strategies in the areas.
Widespread colonization of Tanzanian catchments by introduced Oreochromis tilapia fishes: the legacy from decades of deliberate introductionMy research based on freshwater fishes of Africa, specifically Tanzania.Working on the distribution of tilapia fish (Oreochromis) in Tanzania, and the effects of invasive species on their biodiversity and genetic resources.
MASMA PEACC ProjectResponses of Biological Productivity and Fisheries to Changes in Atmospheric and Oceanographic Conditions in the Upwelling Region Associated With the East African Coastal Current. July 2016-Jun 2018.
SOLSTICE-WIO ProjectSustainable Oceans, Livelihoods and food Security Through Increased Capacity in Ecosystem research in the Western Indian Ocean. Oct 2017-Sep 2021.
Stock status, spatial and temporal distribution ofThe study is two years project financed by regional fisheries project the South West Indian Ocean Fisheries Governance and Shared Growth Program (SWIOFish). This project implemented from July 2017 under the Ministry of Livestock and Fisheries (Mainland). The research activities on large pelagic (tuna and tuna-like) fisheries under the SWIOFish Mainland Tanzania component are focused on the artisanal fishery in inshore and territorial waters. The sampling for Artisanal tuna and tuna-like fishery and Sport Fishing Surveys was conducted monthly in order to collect CPUE, biological and fisheries data.
Research Officer I
Octopus Fishery in the Tanzania MainlandThe aim of the project is to conduct a study on the Stock Assessment, Spatial and Temporal Distribution of Octopus Fishery in the Mainland Tanzania The project is in the second year since its implementation (since September 2018) and it is about 70% completed. So far, the project has been able to generate some interesting scientific data necessary for management of octopus fishery. Catch-effort data, morphometric and biometric data were collected and six (6) progress reports were submitted to SWIOFish Secretariet. Preliminary findings has been presented at four (4) National meetings/Forum and one (1) International meeting. GIS Mapping of octopus reefs and assessment of environmental drivers/parameters in Tanga, Mafia, Songosongo and Mtwara is on-going. For the remaining period, the project will work on genetic samples analysis, data analysis, final report writing, dissemination of findings and publications.
Baseline study on Socio-economic benefits of artisanal tuna and tuna-like fishery in Coastal East Africa region (CEA; Kenya, Tanzania, Mozambique): Baseline study on Socio-economic benefits of artisanal tuna and tuna-like fishery in the Coastal East Africa region (CEA; Kenya, Tanzania, Mozambique): A case study of the United Republic of Tanzania.
Morphology characterization, DNA barcoding and Genetic diversity of some selected anchovy and sardine marine fish species in TanzaniaThe study intends to characterize and assess the diversity of Amblygaster sirm, Encrasicholina devisi, Encrasicholina punctifer and Stolephorus commersonii marine fish species of Tanzanian coastal waters by using morphological and molecular approaches. It is anticipated that this research project will uncover species morphological identification challenges and reveal their diversity within Tanzanian coastal waters.
Small pelagic fishery in the Tanzanian Mainland The aim of this project is to conduct a detailed analysis of the small pelagic fisheries in mainland Tanzania in order to understand the status of the fisheries for management and sustainable utilization of the resource. Nearshore acoustic survey will be conducted to estimate the biomass of small pelagic. The survey will cover the whole coast from the low tide baseline up to 12 nm along the major fishing grounds including Rufiji delta, Zanzibar channel and Tanga. Artisanal fishery surveys are conducted on monthly basis to collect catch/effort and biological data. The project is expected to provide information on the status of the fisheries stocks in term of diversity, abundance, distribution and other biological and environmental parameters. Furthermore, the project will provide information on what species are actually caught, fisheries characteristics, trends in catch and distribution of small pelagic fisheries. The findings will facilitate sustainable management measures of the fisheries resources and recommendations for policy formulation in the region.
Reproductive biology and population characteristics of Decapterus kurroides and Dussumieria acuta from Coast and Dar es Salaam regions, Tanzania.Decapterus kurroides and Dussumieria acuta are among the major contributors to the catches of small pelagic species in Tanzania, contributing significantly to the economy of the coastal communities. However, the two species face high fishing pressure in Tanzanian coastal waters due to their great demands in both local and external markets. This study aims at assessing the reproductive biology and population characteristics of D. kurroides, and D. acuta so as to set biological reference point for management of the two species. .
Identification of mesopelagic fish species of the Benguela region using multi-frequency acoustic approaches and aggregation characteristics for biomass estimationMesopelagic fishes are the small fishes living in the ocean’s twilight zone at depths between 200 and 1000m. They remain one of the least investigated components of the open-ocean ecosystem, with major uncertainties about their global biomass. The recent global biomass estimates of mesopelagic fish are around 1.7–16 gigatonnes. The biomass estimates in the Benguela region is 1.7 million tons. Despite the high biomass of mesopelagic fish in the Benguela and their associated importance in the food web, particularly as a link between zooplankton and hake, the contribution to the total backscatter of mesopelagic species to the total biomass is not well understood. This study use multi-frequency acoustic techniques to discriminate between major mesopelagic aggregations (lanternfish and lightfish), and co-occurring hake, small pelagics and zooplankton). The aim is to document the frequency response of the major scattering organisms encountered and develop methods that will be used to discriminate and assess the biomass of mesopelagic species in the Benguela region.
Digging deep into Lake Victoria’s past: 20,000 years of evolution and ecosystem dynamics in the world’s largest tropical lake reconstructed from sediment cores, fossils and ancient DNAThe aim of the project is to understanding and quantifying the mutual influences of (i) environmental change on biodiversity, and (ii) how biodiversity changes reshape, in turn, environmental conditions over extended time scales is one of the biggest and most timely questions in current environmental sciences. The key-questions to be answered are as follows: • How do physical environments and species interact during the emergence and maintenance of a biodiversity hotspot? • How have climate and environment set the stage for the rapid adaptive radiation of cichlid fishes?
Identification, characterization and vulnerability assessment of benthic ecosystems in the WIOThe aim of the project is to describe, model and map continental shelf and upper slope seabed habitats and their benthic communities in the western part of the Western Indian Ocean (WIO), in order to assist with regional marine spatial planning. The term benthic encompasses organisms which are closely associated with the seabed i.e. are on, in or just above the seabed.
Patterns of small-scale coastal fisheries and local fisheries management in Tanzania: adaption to a changing climateThe major aim of the project is to assess the sensitivity of ecosystem productivity and adaptive response of small-scale fisheries in different coastal communities to accommodate climate change. The focus is on small-scale fisheries targeting shallow-water fish in mangroves, seagrass beds, coral reefs and nearby offshore environments
Application of EO for Identification of potential fishing zone in TanzaniaTanzania Fisheries Research Institute in collaboration with Deep Sea Fishing Authority runs a project which use Earth Observation (EO) satellite information for locating the potential zones of fish aggregation. The project aim at benefiting the fishing community to reduce the time and effort spent in searching the schools of fish, thus improving the profitability and hence, the socio-economic status. The most important part of the project is the validation of the EO data to insitu fish catch data. EO data are obtained from MESA and e-station at TAFIRI while fish catch data are obtained from fishers in selected pilots study areas in Pemba Tanga, Zanzibar and Mafia
Application of Remote Sensing on the identification of preferred habitats for the pelagic fish species and mapping spatial distribution of ring net fishing effort in coastal waters of TanzaniaThe project aim at benefiting the fishing community to reduce the time and effort spent in searching the schools of fish, thus improving the profitability and hence, the socio-economic status. The project is in alignment with component 3 of the SWIOFish (The South West Indian Ocean Fisheries Governance and Shared Growth) project objective which aims to increase economic benefits from priority fisheries. Furthermore, the project implements mapping spatial distribution of fishing effort of ring net vessels targeting small and medium pelagics in Tanzania Mainland and Zanzibar. The project output will contribute to the preparation of Fisheries Management Plans (FMPs) for small pelagics in both ZNZ and Mainland, under SWIOFish project, by providing better information on the spatial distribution of fishing effort. Specifically for ring nets targeting sardines, mackerels, anchovies, and tuna and tuna-like species.
“Characterising the biodiversity of freshwater fishes of Africa using environmental DNA metabarcoding: A case study within the Kilombero river system of Tanzania”. The project focus is the Kilombero system of Tanzania, an area that is still rich in freshwater biodiversity but threatened by the multiple impacts of agriculture, overharvesting and the construction of the new Stiegler’s Gorge mega-dam project immediately downstream. A major challenge faced by aquatic ecologists in Africa is to reliably survey the species composition within a habitat using reliable methods that are not dependent on extensive training in taxonomy or sampling methods. In principle, use of environmental DNA has potential to help address this challenge, and will be particularly valuable in developing countries without extensive research and training infrastructure in freshwater biosciences. This project will test the utility of eDNA for measuring the diversity and the spatial structure of freshwater communities.
A regional framework for data collection and capacity building geared towards sustainable fisheries management and biodiversity conservation in the East African coastThis project aims at contributing to meet the targets of sustainable fisheries management and biodiversity conservation in the East African region by 2030 (SDG 14, target 14.4). Here, overfishing, illegal, unreported and unregulated (IUU) fishing, destructive fishing practices call for the implementation of science-based management plans to restore fish stocks by 2020 (target 14.4). The specific objectives of the project therefore comprise : (1) the establishment of a framework for monitoring and assessment of the artisanal fisheries and ecosystem health in the region; (2) supporting the development of methodologies and computational tools to collect, store and analyse fisheries data to provide management guidelines; (3) development and implementation of digital tools and associated infrastructure to support data collection; (4) support the development of a fisheries training program in the region; (5) development of harmonised regional fisheries assessment and reporting guidelines within the greater East African coastal region. The project runs as a partnership collaboration between the Center for Tropical Marine Research (ZMT) in Germany, Tanzania Fisheries Research Institute (TAFIRI) in mainland Tanzania, the Institute of Marine Science (IMS) in Zanzibar and the National Institute of Fisheries Research (IIP) in Mozambique.
ASSESSMENT OF CONSUMPTION PATTERNS AND FACTORS ASSOCIATED TO UNDERCONSUMPTION OF TUNA AND TUNA-LIKE SPECIES IN TANZANIAThis project intends to explore the consumption patterns and reasons behind underconsumption of commonly caught tuna and tuna-like species (that is Kawakawa, Skipjack tuna and Yellowfin tuna) in coastal communities along with the micronutrient levels (such as calcium, iron, iodine, zinc, omega-3-fatty acids and vitamin A) of the fish relative to other species of primary interest. To this end, the project will use both qualitative (that is key Informant Interviews (KIIs), and Focus Group Discussions) and quantitative (that is, micronutrient levels in tuna and tuna-like species as well as in groupers, rabbit fishes, snappers and emperors) methods. The project is expected to: 1) provide information on consumption patterns of tuna and tuna-like species in coastal communities, 2) provide information on reasons for underconsumption of tuna and tuna-like species in the country, and 3) generate scientific evidence on the health benefits (e.g. source micronutrients) of associated to consumption of tuna and tuna-like species. It is anticipated that these findings will facilitate the establishment of the stable local market that will ensure investment in the tuna fishery sector, such as development of the national tuna fleets including Zanzibar Fishing Company (ZAFICO) and Tanzania Fishing Cooperation (TAFICO), which are both expected to operate within the territorial waters and national EEZ.
Ulotu EE., (2014). Effect of salinity on the reproductive performance of Rufiji tilapia, Oreochromis Urolepis urolepis and Growth of its fry‘‘Effect of Salinity on the Reproductive Performance of Rufiji Tilapia, Oreochromis urolepis urolepis and Growth of its fry’’, is a thesis I submitted in fulfillment of the requirement for the degree of Master of Science (Marine Sciences) of the University of Dar es Salaam.
Ulotu, EE; Aviti J. Mmochi and Lamtane HA., (2016). Effect of Salinity on the Survival and Growth of Rufiji Tilapia (Oreochromis urolepis urolepis) Fry. WIO Journal of Marine Science 15 (2 ) 2016 31-37 An experimental research was conducted to determine the survival and growth of Rufiji tilapia (Oreochromis urolepis urolepis) fry under controlled salinity conditions of 5, 15, 25 and 35 ppt for 56 days. Experiments were carried out in 12 concrete tanks of 1 m3 volume each with three replicates for each treatment. Data was recorded at fourteen days intervals where weight meas¬urements (g) of fry were recorded to the nearest 0.01 g. One Way Analysis of Variance (ANOVA) was used for data analysis. Results showed significant differences in the final body weight, specific growth rate, weight gain and daily growth rate at different salinity levels. The fry reared at a salinity of 25ppt had the highest final body weight, specific growth rate, weight gain and daily growth rate, while the lowest was recorded at the salinity of 5 ppt. There was no significant difference in survival rate among the fry reared at different salinity levels. Dissolved oxygen (DO) was significantly different at different levels of salinity but temperature and pH showed no significant differences. The results suggest that under proper management, Rufiji tilapia can be farmed in brackish and sea water by coastal communities along the coast.
AP Shoko, SM Limbu, HA Lamtane, MA Kishe-Machumu, B Sekadende, EE Ulotu, JC Masanja & YD Mgaya (2019): The role of fish-poultry integration on fish growth performance, yields and economic benefits among smallholder farmers in sub-Saharan Africa, Tanzania, African Journal of Aquatic Science, DOI: 10.2989/16085914.2018.1555512.Aquaculture practices from sub-Saharan Africa are characterized by low production, owing to improper technology. Production can be increased through integrating fish farming with other existing on-farm activities, particularly livestock husbandry. We assessed the role of fish-poultry integration on all male Nile tilapia, Oreochromis niloticus growth performance, yields and economic benefits among smallholder farmers in sub-Saharan Africa, Tanzania. The study also compared phytoplankton species composition, abundance and biomass between the fish-poultry integration and non-integrated system. After 180 days of the experiment, all male O. niloticus cultured under fish-poultry integration exhibited significantly higher growth rates than those in the non-integrated system (p < 0.05). Gross fish yield (GFY), net fish yield (NFY) and net annual yields (NAY) obtained from fish-poultry integration were significantly higher than those from non-integrated system (p < 0.05). Partial enterprise budget analysis revealed that fish-poultry integration was more profitable than the non-integrated system. Moreover, fish-poultry integrated system produced significantly higher phytoplankton abundance and biomass than those from the non-integrated system. Results demonstrate that rural smallholder farmers can achieve higher growth rate, farm net yields and income by integrating all male O. niloticus with other on-farm activities than practicing a stand-alone fish culture system.
Chande, M; Kimirei, IA ; Igulu, MM; Kuguru, B; Kayanda, B; Mwakosya, C; Kangwe, SJ; Sululu, J and Ulotu E., (2019). Assessment of the impacts of artisanal fishing gears on nearshore fish stocks along coastal waters off the Kilwa–Mafia seascape in Tanzania. Regional Studies in Marine Science 27 (2019) 100531Small-scale fisheries (SSF) in many parts of the worlds are known to support the livelihoods of millions of coastal communities. Also, SSF are characterized by being multispecies and multi-gear, a fact that poses management and conservation challenges to this critical natural capital. Little is known about the catch composition and the impact of the artisanal fishing gears to the fishery in Tanzania. The current study assessed catch composition and effects of three major fishing gears namely handlines, gillnets, and traps using data collected from 2008 to 2011 along the Kilwa–Mafia seascape in Tanzania. A total of 214 species, belonging to 46 families, were recorded of which 15 species accounted for 82% of the catch in all gears combined. The most common species recorded were halfbeaks (Hemiramphus far), marbled parrotfish (Leptoscarus vaigiensis), sky emperor (Lethrinus mahsena), pink ear emperor (Lethrinus lentjan) and shoemaker spinefoot (Siganus sutor). Lethrinidae was the overall dominant group, contributing to more than 30% of the total catches. The findings suggest the presence of gear selectivity on individual species, particularly Leptoscarus vaigiensis (20.4%), H. far (59.53%) and L. mahsena (31.8%) which dominated catches from traps, gillnets, and handlines, respectively. Furthermore, productivity and susceptibility analysis (PSA) indicates that L. lentjan is at high risk of depletion, suggesting a gear-based management approach is needed.
Mapping spatial distribution of Ring-net fishing effort and validation of PFZ (Potential Fishing Zones) fronts.Currently, the offshore fish stocks and in particular the pelagic fish resources are under exploited due to inadequate knowledge of locating good fishing grounds. We observe a reduction in fish catch along the coast which is of concern as it is a threat to the local economy, food security and the livelihoods of the coastal local communities. The project aim at reducing fishing pressure in shallow waters and help fishers to venture off-shore for potential fishing grounds through application of Earth Observation satellite technology.
Technologies for African Agricultural Transformation (TAAT)The TAAT Aquaculture compact is one of the fifteen compacts comprising the Technologies for African Agricultural Transformation program (TAAT) led by the WorldFish. The Compact will assist in dissemination and upscaling Aquaculture technologies across Africa to increase farmer’s productivity, increase fish protein consumption and enhance sustainability across Aquaculture value chain. The technologies to be demonstrated and up scaled through the Aquaculture compact include: Fast growing quality fish seeds and improved fish rearing technologies: Tilapia (Oreochromis niloticus) and catfish (Clarias gariepinus, hybrids of Hetero-clarias), Quality low cost fish feed using local raw materials and Improved postharvest technologies and product development
Ocean Acidification Observation in Tanzanian Coastal WatersIn Tanzania and many other African coastal states, especially within the Western Indian Ocean (WIO) region where OA observations and data are extremely limited and or non-existent, implementation of the Sustainable Development Goal (SDG) 14.3 will likely be delayed. Therefore, this project was proposed to establish OA observation system in Tanzania, which will assist in determining the status and future effects of coastal acidification and warning to marine organisms in the country and the WIO region.
Prevalence of nematodes (Anisakis nematodes) and zoonotic bacteria in Trichiurus lepturus an allegation for human health concernGeneral Objective of this Project is to determine the prevalence of Anisakis parasite and zoonotic bacteria; Mycobacterium marinum, Streptococcus iniae, Vibrio vulnificus and Edwardsiela tarda, in Trichiurus lepturus in the coastal waters of Tanzania. Samples of fish will be collected from the proposed study site following the standard and recommended procedures for microbiology sampling procedures, then sent to laboratory for analysis for the mentioned pathogens and suggest the possible route course for management purposes and health caution. Findings from this study will serve as the baseline data on the status of zoonotic and ascaridoid parasites risk associated with the commercial species (i.e. Trichiurus lepturus) to fishers and other stakeholder along the chain. The findings will also help on suggesting the mitigation measures to minimize the health risks hence serve the human lives. It will also provide important information to clinical professionals in case of outbreak of diseases associated with the pathogens under investigation.
Fishing under the threat of a tipping point A full-cycle, multi-methods approach to the Lake Victoria Nile perch fishery This is a three year research project comprising research scientists in behavioral and environmental economists, cognitive and environmental psychologists, mathematical modelers, and fisheries experts to investigate how economic, institutional, and cognitive drivers could conspire to cause the long-term irreversible collapse of the Lake Victoria Nile perch fishery, a backbone of local livelihoods. Working empirically and experimentally, conducting field interventions, and integrating the results through analytical and agent-based modelling, the partners will together extend the knowledge base for a better understanding of the coupled socio-ecological system of the Nile perch fishery and for averting deleterious outcomes. The full-cycle, multi-methods approach and the insights so produced also inform future research into tipping points in heavily exploited socioecological systems
Perfomance of Vertically-Joined Gillnets in Nile Perch Fishery in Lake Victoria (Tanzania)The Ministry of Livestock and Fisheries commissioned to TAFIRI a study to assess the performance of vertically joined gillnets against the single panel (26 vertical meshes) gillnets. Vertical joining is currently illegal but the number of vertically joined gillnets has been steadily increasing from 304,348 (76.9%) in 2008 to 318,157 (88.1%) in 2016. This increase was mostly contributed by 78 meshes (triple panel nets) which increased from 155,815 (39.4%) to 172,268 (47.7%) in the same time period. In the absence of knowledge about other factors this may be perceived as unsustainable increase of fishing effort. However, this study has shown that the increase is mainly in the deeper waters which could otherwise be under-exploited using the single panel gillnets. The study shows that CPUE of single panel gillnets is very low in the deeper waters. It is, therefore, recommended that triple panel nets be accepted as legal gillnets instead of retaining the conventional single panel which are best suited for shallow waters. This is also based on the fact that all fish nursery and breeding sites occur in the inshore shallow waters.
Adoption and Consequences of New Light Fishing Technology in Dagaa Fishery of Lake Victoria (Tanzania)This study, conducted between March and May 2019, provides a comprehensive baseline information on characteristics the lighting systems currently use Lake Victoria Dagaa fishery. Although the LED lamps differed in performance, their spectral light characteristics were fairly similar but notably different from kerosene pressure lamps. The former had relatively higher dagaa catch rates and caught fewer species hence more restrictive of bycatch species. No detectable quantities of hydrocarbons were recorded in the fish caught by any of the lamp categories engaged in this study. Likewise, ionising radiations emitted by all the lamp categories fell below the tolerable levels posing no threat in this respect. Recorded wattages of LED lamps fell within the range of 2.25 – 5 Watts. Since the results of this study did not raise any concern for the LED lamps the maximum allowable wattage is hereby recommended to be set at 5 W.