Tidal periodicity of molting in giant mud crab, Scylla serrata (forskål, 1775)

Molting is the most crucial phase in life cycle of mangrove crabs, leading to mortality various culture systems. As a result this exigency, study was conducted offer cue molting using tidal as one visible events natural context. Monitoring carried out at every 1-hour interval (24 hours) day and night for 57 days check while taking into account key environmental elements such cycles, water current speed, flow rate. The results showed that 70.6% happened during high tide, with 93.8% it occurring 6.3% day. By contrast, only 29.4% occurred low showing significant difference (T-test = 0.011, p < 0.05) between mean molts. Hence, highest rate (88.2%) observed episodes neap middle tide (55.9%) 12.4±0.9 m/s, (32.4%) 16.8±2.0 spring (11.8%) 9.5±1.2 m/s. occurs because crabs' rheotactic behavioral responses incoming new help crab's body fill air throughout process. Mangrove crabs employ their periodicity defense strategy against potential predators mortality, can be used indicator many