Effect of salinity on the development of larvae and juvenile instars of Heteropanope indica De Man (Decapoda: Brachyura)

S. Selvakumar, S. Ajmalkhan, R. Natarajan

Abstract



There are 3 zoeal stages and a megalopa in the larval life history of Heteropanope indica. The effect of salinity on the larval life history and juvenile development was studied in the present work in 7 test salinities (5, 10, 15, 20, 25, 30 and 35%). The larval development was completed in a salinity range of 10-30%, and that of juvenile development in 5-30ppt. In the above salinity ranges, survival was 100% in both. As the intermoult period of zoea larvae was shorter in 25ppt, this appears to be the optimum salinity for the development of zoeal larval stages. Development of megalopa and further development through juvenile instars was faster in 15ppt. The larval stages of this crab were found to be hardly compared to the larvae of other crab species, as 100% survival was observed in a wide range of salinity

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