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Abstract:
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Habitat ecology and food and feeding of the herring bow crab, Varuna litterata of Cochin Backwaters, Kerala,
India were investigated for a period of one year (April 2011-March 2012). Among the 15 stations surveyed,
the crabs were found to occur only in 4 stations, which had a close proximity to the sea. Sediment analysis of
the stations revealed that the substratum of these stations is sandy in nature and is rich in organic carbon
content (0.79% to 1.07%). These estuarine crabs is euryhaline and are found to be distributed in areas with a
sandy substratum, higher organic carbon content and more tidal influx. The stomach contents analysis of crabs
examined showed that their diet included crustacean remains, plants, sand and debris, fishes, miscellaneous
group and unidentified matter. In adults and sub-adults, crustaceans formed the dominant food group, while in
juveniles, sand and debris formed the dominant group. From the present study, V. litterata was found to be a
predatory omnivore capable of ingesting both animal and plant tissues |