http://worldcat.org/entity/work/id/10494346

Studies on the Time Course of Salinity and Temperature Adaptation in the Commercial Brown Shrimp Penaeus aztecus Ives

The time course of salinity and temperature adaptation in juvenile-adult brown shrimp Penaeus aztecus was determined by analysing certain behavioral and physiological responses, the respiratory rates and osmotic and ionic regulation. The animals were transferred separately from a background salinity (S) 15 0/00 (control) and temperatures of 18, 25 and 32 C to different test conditions for salinity adaptation. Test salinities were 2, 5, 10, 15, 25 and 36 0/00 and temperatures were 18, 25 and 32 C. Testing lasted one week. The behavior of the experimental shrimp was influenced at 25 C, which was their normal habitat temperature, primarily by salinity changes. At other temperatures, behavior was affected by the interaction of salinity and temperature. At 25 C there was a positive interaction in the various phases of adaptation between respiratory rates on the one hand and osmotic and chloride ion gradients on the other in the respective salinities. This interaction was not consistent at other test temperatures. In brown shrimp, salinity and temperature requirements are shown to be size-dependent.

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