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Cortisol and thyroid hormone responses to acid stress in the brown trout salmo trutta l



Cortisol and thyroid hormone responses to acid stress in the brown trout salmo trutta l



Journal of Fish Biology 35(1): 73-84



Individual cannulated brown trout monitored during exposure to acidic water showed increased plasma cortisol after 3 h at pH 4.0 with low (0.05 mM) or high (2.8 mM) calcium (Ca) content, and after 2 days in acidic water with a high Ca content. Most fish did not survive for 2 days in acidic water with a low Ca content. Non-cannulated fish showed a similar increase in mean plasma cortisol after 2 days in high-Ca acidic water (pH 4.0-4.6), but not in acidic water of a low Ca content. After 7 days of exposure to acidic water, plasma cortisol appeared to recover when there was a high Ca content but increased 20-fold when Ca content was low. In cannulated fish severe acid stress resulted in a marked and rapid thyroid response. Plasma thyroxine (T4) was elevated after 3 h exposure to acidic water of both low and high Ca content and remained elevated for 2 days of acid exposure with high Ca. In non-cannulated fish an increase in mean T4 was apparent only after 7 days in low-Ca acidic water. Plasma triiodothyronine (T3) levels were not significantly altered by any of the acid regimes. Plasma glucose of cannulated fish was elevated within 3 h of acid-exposure and remained elevated after 2 days in high-Ca acidic water.

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Accession: 007165333

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DOI: 10.1111/j.1095-8649.1989.tb03394.x


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