Studies on heat tolerance in the fresh water crab barytelphusa cunicularis

Diwan, A.D.; Nagabhushanam, R.

Hydrobiologia 50(1): 65-70

1976


ISSN/ISBN: 0018-8158
DOI: 10.1007/bf00016842
Accession: 006507777

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Abstract
The effect of laboratory acclimation on heat tolerance was determined for the freshwater crab, B. cunicularis at various temperature and salinity combinations. High temperature acclimation generally increased resistance to lethal temperatures whereas acclimation to salinity, either at high or low temperature, decreased it. A combination of high temperature and normal freshwater was the most favorable to withstand the high test tolerance temperature. After acclimation to low temperature, gain in heat tolerance was rapid both at high temperature and fresh-water as well as high temperature and 0.5% salinity combinations. The water content in the whole animal and in the hepatopancreas increased on warm acclimation. Hepatopancreas glycogen and blood sugar level increased with rise in temperature. The fat and protein content of the hepatopancreas increased on cold acclimation. The reverse occurred on warm acclimation.

Studies on heat tolerance in the fresh water crab barytelphusa cunicularis