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Osmoregulatory changes in wedge sole ( Dicologoglossa cuneata Moreau, 1881) after acclimation to different environmental salinities
Author(s) -
Herrera Marcelino,
VargasChacoff Luis,
Hachero Ismael,
RuízJarabo Ignacio,
Rodiles Ana,
Navas José I,
Mancera Juan M
Publication year - 2009
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2008.02147.x
Subject(s) - biology , euryhaline , acclimatization , salinity , gill , osmoregulation , plasma osmolality , zoology , glycogen , metabolite , ecology , fishery , biochemistry , fish <actinopterygii> , endocrinology , vasopressin
The osmoregulatory responses of 20 days of acclimation to environmental salinities of 5‰, 15‰, 25‰, 35‰ and 55‰ were assessed in juveniles of wedge sole ( Dicologoglossa cuneata Moreau, 1881). This sole shows a good capacity to adapt to this range of environmental salinities. A direct linear relationship between environmental salinity and plasma osmolality was observed, with a calculated isosmotic point of 10.4‰ (284 mOsm kg −1 ). Na + , K + ‐ATPase activity in the gills followed a ‘U‐shaped’ relationship with environmental salinity, and a direct linear relationship in kidney tissue. Plasma cortisol levels were elevated in fish held in extreme salinities, and glucose levels were higher only in the group maintained at the highest environmental salinity. In the liver, a decrease in glycogen, lactate and amino acid contents was observed in specimens acclimated to extreme salinities (5‰ and 55‰), suggesting mobilization of liver metabolites. Metabolite levels in white muscle showed a pattern similar to the liver, with lower values in specimens acclimated to extreme salinities. We conclude that wedge sole is strongly euryhaline, but acclimation to extreme salinities comes with an energetic cost.