Reduced growth of Atlantic cod in non‐lethal hypoxic conditions

Journal of Fish Biology - Tập 55 Số 3 - Trang 472-491 - 1999
Denis Chabot1, J.‐D. Dutil1
1Ministère des Pêches et des Océans, Institut Maurice‐Lamontagne, C.P. 1000, Mont‐Joli, QC, Canada G5H 3Z4

Tóm tắt

Growth in length and mass, improvements in condition, as well as final condition of c. 700 g Atlantic cod Gadus morhua were significantly less at 45% and 56% O2 saturation than at 65%, 75%, 84% and 93% O2 saturation. Hypoxia decreased food consumption. In turn, food consumption explained 97% of the variation in growth. Conversion efficiency varied slightly, but significantly, with level of dissolved O2, except that the group reared at 93% O2 had a lower than expected conversion efficiency. Slow growth in low O2 was not due to increased activity, because activity decreased in hypoxia. In the Gulf of St Lawrence, waters deeper than 200 m usually are <65% saturated in O2, and thus should impact negatively on cod growth.

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Journal of Fish Biology

Tập 55 Số 3

472-491

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