Genetic connectivity of Fenneropenaeus indicus (H. Milne Edwards 1837) among three prawn fishing grounds of Tanzanian coastal waters

Genetic evidence for a single stock of giant tiger prawns Penaeus monodon in demarcated prawn fishing zones of Tanzania

“…The observed lack of genetic differentiation suggests considerable gene flow across the three fishing zones and that giant tiger prawns in each zone were part of a single stock. Genetic evidence of a single stock has also been reported in Indian prawns ( Fenneropenaeus indicus ) (Mwakosya et al, 2018), giant mud crabs (Rumisha et al, 2018) and other macroinvertebrates from Tanzania (Silva et al, 2013). The observed lack of genetic differentiation was most likely the result of gene flow during the larval stage.…”

“…Tajima's D and Fu's Fs values that were significantly less than zero, as well as sequences with a unimodal mismatch distribution, further support recent population expansion. Recent demographic expansion that has also been reported for several other marine fauna from the WIO has been linked to Pleistocene sea-level fluctuations (Mwakosya et al, 2018;Rumisha, Huyghe, et al, 2017;Saher et al, 2021;Tan et al, 2020). Glacial cycles during the Pleistocene period that reduced global sea level by 130 meters below its current level resulted in a reduction in coastal habitats and a population bottleneck (Ludt & Rocha, 2015).…”

“…However, because information on the genetic stock structure of giant tiger prawns in Tanzania is currently limited, there is a chance that the three demarcated fishing zones do not correspond to the genetic stock structure of giant tiger prawns. Available data focuses primarily on the genetic stock structures of the Indian prawns (Fenneropenaeus indicus), crabs, mangrove snails, and other marine fauna from Tanzania (Mwakosya et al, 2018;Nehemia et al, 2017Nehemia et al, , 2019Otwoma & Kochzius, 2016;Rumisha et al, 2018). The only available study on giant tiger prawns was primarily concerned with the impact of trace metal pollution on genetic connectivity, so samples were drawn primarily from pollution hotspots rather than prawn fishing grounds in the three demarcated zones (Rumisha, Leermakers, et al, 2017).…”

COI gene sequencing reveals genetic population structuring and a separate lineage of the green tiger prawn Penaeus semisulcatus in the Gulf of Suez and the Bitter Lakes, Egypt

“…However, other scenarios exist for this pattern of nucleotide and haplotype diversities, including the subjection of species to overexploitation and habitat destruction. This was suggested for several other species of shrimps around the world, including for example the pink shrimp Farfantepenaeus paulensis (Pérez Farfante, 1967) in the south-southeastern coast of Brazil (Teodoro et al, 2020) and the Indian prawn Fenneropenaeus indicus (H. Milne Edwards, 1837) in the Tanzanian coastal waters (Mwakosya et al, 2018). In all cases, these may represent signs of the necessity of more serious investigation of species state of conservation and application of through stock surveillance management strategies.…”