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Renal water and solute excretion in the Atlantic stingray in fresh water
Author(s) -
Janech M. G.,
Piermarini P. M.
Publication year - 2002
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2002.tb01863.x
Subject(s) - euryhaline , biology , stingray , fresh water , freshwater fish , free water clearance , fishery , urea , zoology , excretion , ecology , fish <actinopterygii> , endocrinology , biochemistry
Freshwater, male Atlantic stingrays Dasyatis sabina , from Lake Jesup, Florida, U·S·A·, excreted a dilute urine similar in composition to freshwater teleosts and lampreys with the exception that urea was the primary osmolyte. Urine flow rate was 2·5 to 10 fold higher than that reported for freshwater teleosts resulting in high free‐water clearance. Mass‐specific free‐water clearance values from euryhaline elasmobranchs inhabiting freshwater environments greatly exceed those for freshwater teleosts and are nearly equivalent to those of freshwater lampreys.