Estimation of Peak Spawning Season, Length at Maturity (Lm) and Sex Ratio of Silver Pomfret (Pampus argenteus) in the Bay of Bengal, Bangladesh
Estimation of Peak Spawning Season, Length at Maturity (Lm) and Sex Ratio of Silver Pomfret (Pampus argenteus) in the Bay of Bengal, Bangladesh
Md. Abdullah Al-Mamun1,2, Al-Mamun2,3, Sanjay Kumar Mohanta2,3, Md. Farhan Tazim2,3, Mohammed Rashed Parvej 2,3, Md. Sharif Uddin2,3, Suman Barua1,2 and Liu Qun1*
ABSTRACT
The information on size at maturity (Lm), peak spawning season, and sex ratio is crucial for sustainable management for fisheries production. Our study in mers of 655 Silver Pomfret, Pampus argenteus, 366 females and 289 males, collected monthly between February 2019 and January 2020, provides insight into the characteristics of size at sexual maturity, peak spawning season, and sex ratio of the species. Monthly variation in the gonadosomatic index (GSI) values and histological observations has revealed two spawning peaks, in spring (April-May) and fall (September). The maximum GSI has accounted to 4.70±1.45 and 5.01±1.75, which corresponded to warmer water temperature 29.68ºC±0.60 in April and 29.72ºC±0.28 in May, respectively, over the Bay of Bengal. At 50% sexual maturity (Lm), males mature at standard length of 145 mm and females at 163 mm. During the peak spawning time, the sex ratio significantly differed from 0.5, with females dominating over males, according to a Chi-squared test (p<0.05). To ensure sustainable exploitation of this valuable species, implemention of the mesh size regulation for protecting this species less than 145 mm and seasonal closures in the Bay of Bengal (BoB), Bangladesh would be very effective.
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