A 120-day cage grow-out production performance of Nile Tilapia, Oreochromis niloticus was conducted in the Dakatia river, Echoli, Chandpur to identify an optimal stocking density. The three stocking densities were used at 30, 50, and 70 tilapia m-3 under three treatments with triplicate. The initial average weight of tilapia fingerlings at 32.31±9.59 g was stocked. Final weight, specific growth rate, and survival were significantly (p < 0.05) higher in the 30 tilapia m-3 stocking density than those in the 50 and 70 tilapia m-3 stocking densities. The best food conversion ratio of 1.47 was found in the 30 tilapia m-3 stocking density and followed by 2.0 and 2.90 in the 50 and 70 tilapia m-3 stocking densities, respectively. The production was comparable (p > 0.05) between the 50 and 70 tilapia m-3 stocking densities; however, the net profit was higher (p < 0.05) in the 50 tilapia m-3 stocking density group compared to the two other stocking density groups. This study suggests a stocking of density at 50 tilapia m-3 to increase Nile Tilapia O. niloticus productivity in the riverine cage culture system.
Bangladesh J. Zool. 50 (2): 239-250, 2022
Charybdis lucifera (Fabricius, 1798), Demania reynaudii (H. Milne Edwards, 1834), Galene bispinosa (Herbst, 1783), and Neodorippe callida (Fabricius, 1798) are documented for the first time from the territorial waters of Bangladesh. Before this account, the families Dorippidae MacLeay, 1838 and Galenidae Alcock, 1898 were also unknown to the country. All specimens but Neodorippe callida were sampled from St. Martin’s Island, a sedimentary island on the continental shelf. We encountered N. callida from Dublar Char Island, a mangrove block extending into the Bay of Bengal. We collected D. reynaudii from a beach food stall, being displayed apparently unaware of the species’ toxicity, which seems not to be known in the region; the other species were sourced from artisanal seining activities. Here, taxonomic traits of these species are discussed respective to close congeners, and with necessary remarks on their locality.
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