Blood osmolality shift in juvenile red drum, Sciaenops ocellatus L. exposed to fresh water |
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| Authors: | P A Crocker C R Arnold J A DeBoer G J Holt |
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| Institution: | University of Texas Marine Science Institute, Port Aransas Marine Laboratory, Port Aransas, Texas 78373, U.S.A. |
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| Abstract: | Juvenile red drum, Sciaenops ocellatus , measuring 40–49 mm s.l. tolerated abrupt transfer from 28%osalinity sea water to fresh water (< l%o). A significant shift in blood osmolality from a level of about 350 mosmol l−1 in sea water to a new level of about 311 mosmol l−1 was experienced by fish after 48 h in fresh water. The shift was followed by a slight reduction in blood osmolality to a sustained level of 300 mosmol l−1 after 96 h exposure to fresh water. The overall effect of increased environmental calcium on blood osmotic pressure of young red drum was not significant at the level tested. |
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