Blood osmolality shift in juvenile red drum, Sciaenops ocellatus L. exposed to fresh water

• Published in: Journal of Fish Biology
• Main Authors: Crocker, P. A., Arnold, C. R., DeBoer, J. A., Holt, G. J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1983
• Subjects: Red drum; Sciaenops ocellatus
• Online Access: http://dx.doi.org/10.1111/j.1095-8649.1983.tb02910.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1983.tb02910.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1983.tb02910.x

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.