Oxygen consumption, ammonia excretion and random activity in Penaeus semisulcatus, Macrobrachium malcolmsonii and Paratelphusa hydrodromus with reference to ambient oxygen

Laxminarayana, A and Kutty, M N (1982) Oxygen consumption, ammonia excretion and random activity in Penaeus semisulcatus, Macrobrachium malcolmsonii and Paratelphusa hydrodromus with reference to ambient oxygen. In: Proceedings of the Symposium on Coastal Aquaculture, Part 1, MBAI, 12-18 January 1980, Cochin.

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Abstract

Oxygen consumption, ammonia excretion and random activity in relation to ambient oxygen have been investigated in a marine prawn, Penaeus semisulcatus, a freshwater pravm, Macrobrachium malcolmsonii and a freshwater crab, Paratelphusa hyiirodromus. At normoxia, P. semisulcatus maintained an ammonia quotient (A.Q.=volume or mole; mole relation of ammonia excreted to oxygen consumed) of about 0.06, M.malcoimsonii maintained an A.Q. of about 0.08 and P. Hydrodromus an A.Q. of about 0.2s. Under hypoxic conditions all these three crustaceans showed high ammonia quotients. The 2 to 5 fold increase in A.Q. values in hypoxic conditions indicates increased protein degradation and may be of value in combating acid base balance as in the case of fishes. The random activity increased in hypoxic conditions in the case of P. semisulcatus and M. malcolmsonii whereas in the case of P. hydrodromus the activity decreased in hypoxic conditions indicating a dichotomy in behaviour which appears to have ecological significance. The metabolic rate decreased in hypoxic conditions in all the three species.

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