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Biol Bull 119: 560-571. (December 1960)
© 1960 Marine Biological Laboratory
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THE INFLUENCE OF TEMPERATURE ON OSMOTIC REGULATION IN TWO SPECIES OF ESTUARINE SHRIMPS (PENAEUS)

AUSTIN B. WILLIAMS 1

1 University of North Carolina, Institute of Fisheries Research, Morehead City, North Carolina

1. Melting point determinations on blood of two species of shrimp, Penaeus aztecus and P. duorarum, were made in an array of salinities of 10.06, 15.11, 20.17, 25.09, and 30.50%0 at 28.1-28.8, 16.2-17.8 and 8.75-8.8° C.

2. These shrimp are hypotonic to sea water at room temperature and hypertonic to dilutions of sea water below 30%0.

3. These shrimp regulate moderately well in experimental dilutions at room temperature, though the blood is diluted somewhat in lowered salinities.

4. At lowered temperatures, 8.75-8.8° C., regulatory ability is impaired and blood tends toward isotonicity.

5. P. duorarum is a better regulator at low temperatures than P. astecus.

6. Survival of these shrimp is better in higher salinities at low temperatures.






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