Investigations of the life-history traits of the Indian mackerel, Rastrelliger kanagurta (Cuvier, 1817) and its exploitation along the coastal waters of Tanzania

Investigations of the life-history traits of the Indian mackerel, Rastrelliger  kanagurta (Cuvier, 1817) and its exploitation along the coastal waters of  Tanzania

This PhD research aims to investigate the life-history traits of the Indian mackerel, Rastrelliger kanagurta (Cuvier, 1817), and its exploitation along the coastal waters of Tanzania. The study addresses key aspects of the species’s biology, genetics, ecology and exploitation along coastal fishing communities to enhance sustainable fisheries management in the region. 

Objective-wise: First the research will detail the genetic diversity and population structure of the Rastrelliger kanagurta in the coastal waters of Tanzania using D-loop genetic marker. Secondly, Metabarcoding approach will be used to describe the feeding behavior of Rastrelliger kanagurta to elucidate its trophic relationship and dietary pattern found in Tanzania coastal waters. Thirdly, the study will determine the reproductive potential and spawning patterns of R. kanagurta, which is critical for assessing the species’ reproductive cycles and ensuring the protection of spawning aggregations. Fourth, the research will assess the exploitation rate and fishing season patterns of R. kanagurta caught along the Tanzanian coast, offering vital information on fishing pressure and seasonality. Lastly, we will evaluate the ecological knowledge of local fishers regarding the life-history traits of R. kanagurta and its exploitation, contributing to community-based fisheries management strategies in Tanzania.

The findings of this study will provide a comprehensive knowledge and understanding of the biology and exploitation of R. kanagurta, supporting government efforts for sustainable fisheries management and conservation along Tanzania’s coastal waters. The integration of genetic, ecological, and socio-ecological data will inform policy decisions aimed at ensuring the long-term viability of this important marine resource.