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Environmental induction of Na + transporter affinity in Atlantic salmon embryos
Author(s) -
McWilliams P. G.
Publication year - 1993
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.1095-8649.1993.tb00310.x
Subject(s) - salmo , hatching , biology , zoology , transporter , sodium , embryo , biochemistry , fish <actinopterygii> , fishery , chemistry , organic chemistry , gene
Atlantic salmon ( Salmo salar L.) alevins hatched from eggs transferred from high‐ to low‐Na water at 250° days, before the onset of the phase of increasing whole egg sodium content (at ∼380°days), showed a significantly reduced K m for Na + transport, whereas transfer at 400° days did not produce any change in K m . Alevins hatched from eggs given acid shocks of 1, 3, 7 or 14 days duration initiated at 250 or 400° days showed no significant changes in Na + transporter K m . Extended acid exposure (38 days) from 250°days to hatching resulted in a slight lowering of K m (P<0.05). A 24‐day acid exposure from 400°days to hatching had no effect on Na + transporter K m . Alevins hatched from eggs incubated throughout in acidified water had a significantly reduced K m compared to controls (P<0.01). The timing and duration of periods of Na depletion of eggs is considered with respect to environmental induction of increased Na transporter affinity in teleost embryos as a mechanism of long‐term physiological adaptation to the gradual acidification of natural waters.