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2011

Studies on brachyuran crabs from mallipattnam (Palk Strait) southeast coast of India

Author:Saminathan, N., Kannathasan, A and Rajendran, K

Abstract:
Brachyuran crabs for the present investigation were collected from offshore region of Mallipattinam (Lat. 10Â°12ï‚¢ NS. and Long. 79Â°20ï‚¢ EW) which is situated near sethubhava ghatiam on sethusamudram canal. Ashvini River enters into Palk Strait at Mallipattinam, which carries large among of nutrients flushing into the probably promotes the species biodiversity both racially and individually. In the present investigation nearly 23 species of marine crabs are landing at Mallipattinam coast. Out of these twenty three species frequency of landing restricted to 12 species alone. They are Portunus pelagicus, P. sanginolentus, C. lucifera, C. feriata, C. callinosa, Podophthalmus vigil, Galene bispinosa, Ocypoda macrocera, Ocypoda platytarsis, Calappa lophos, C. bicornis, and Philyra globasca. In these groups some species are non-edible and others are edible but the non-edible species are commercially important because of their use in aqua and poultry feed industry. The population density, distribution frequency, sex ratio, fecundity of these crabs showed significant variation with reference to seasons. The study critically focusing the fact, that the biodiversity of brachyuran species and even other species may be decline in future due to the deposition of sand into the Palk Strait region. In these areas indicates that this area suitable for crab inhabiting and propagation.