Reproductive biology of the three-spot swimming crab (Portunus sanguinolentus) from the west coast of Sri Lanka with a novel approach to determine the maturity stage of male gonads

Gonadal Development and Fecundity of Swimming Crab Portunus segnis (Forskal, 1775) in Coastal Waters of Balochistan, Pakistan

“…Few smaller crabs that hold more eggs than larger crabs have also been identified. The present findings are similar to Wimalasiri and Dissanayake (2016) who estimated the fecundity range of P. sanguinolentus between 112017 and1380223 number of eggs. Kamrani et al (2010) reported that females of P. pelagicus at ranged from 32 to 173 mm CW produce 277421 to 1114348 eggs and their mean fecundity was 662978 eggs.…”

“…for the 113 female specimens. The GSI of P. sanguinolentus females were significantly higher than that of males, estimated by Wimalasiri and Dissanayake (2016). Present findings are not comparable to those of Sahoo et al (2011) who P. pelagicus reported that in the GSI was less than 0.5 in December to February while in May to July the GSI was increased from 2.0 to 2.5.…”

“…Present findings are not comparable to those of Sahoo et al (2011) who P. pelagicus reported that in the GSI was less than 0.5 in December to February while in May to July the GSI was increased from 2.0 to 2.5. Wimalasiri and Dissanayake (2016) recorded GSI ranging from 0.02 to 3.69 for males (mean 0.75 ± 0.58 S.D) and from 0.12 to 9.44 for females (mean 3.29 ± 2.13 S.D).…”

“…Potter and De-lestang (2000) studied P. pelagicus, which showed that 50 percent of females had sexual maturity while they were 97 mm CW, while male crabs were 84 mm CW. The present findings are not comparable to those of Wardiatno and Fahrudin (2015) who reported that 50 per cent of males and females P. pelagicus sexual maturity at 98 mm and 103 mm carapace width (CW), respectively; Tureli and Yesilyurt (2017) who reported 50 per cent of females P. segnis sexual maturity at 115 and 119.99 mm CW; Safaie et al (2013) who and recorded 50% of females sexual maturity P. segnis at size of 113 mm CW; Soundarapandian et al (2013) who reported 50 percent of male crabs sexual maturity in P. pelagicus at the size of 106 to 110 mm of carapace width; and Wimalasiri and Dissanayake (2016) who estimated the size of P. sanguinolentus at first sexual maturity, in males with 97 mm CW, and females at 94 mm CW.…”

Morphometric Differentiation of the Swimming Crab Portunus sanguinolentus (Herbst, 1783) Populations in East Asia: Implications for Stock Identification and Management

“…Therefore, multivariate statistical techniques that can separate size and shape effects, as well as account for spatial and temporal variations, are needed to provide reliable insights into the population differentiation of this species. Such variations in sex ratios may be ascribed to disparities in mortality rates, sex-differentiated habitat preference, or potential unisexual migration [41][42][43][44][45][46]. The depth and specific physical characteristics of the sampling location could also affect the sex distribution of captured P. sanguinolentus, leading to the documented discrepancies in sex ratios.…”