Oceanic Influences on Mud Crab (Scylla olivacea) Reproductive Traits
This study presents the first comparative analysis on reproductive biology of Scylla olivacea in the coastal areas of Thailand comparing populations from the Andaman Sea and the Gulf of Thailand (GoT). The results revealed clear regional differences in body size, reproductive parameters, and seasonal reproductive patterns likely shaped by distinct oceanographic conditions and varying fishing pressures. Notably, crabs from the Andaman Sea, particularly in Ranong Province, had smaller body sizes but higher reproductive indices viz., gonadosomatic index (GSI) and fecundity, compared to those from the GoT. Reproductive peaks in November highlight the influence of monsoon driven oceanic dynamics on breeding rhythms. These insights advance understanding of S. olivacea reproductive ecology and support region specific management measures such as establishing region specific minimum size limits and temporal protection measures ssential to ensure long term sustainability of S. olivacea fisheries in Thailand.
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