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Free Content The Growth of Young Salmonids (Onchorhynchus Keta): Controlled Ecosystem Pollution Experiment

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The growth of juvenile chum salmon (Oncorhynchus keta) in full-scale (1,700 m2) controlled ecosystems was followed over a period of 45 days. The controlled ecosystems supported the growth of juvenile salmon when large crustacean zooplankton were present as part of the natural food chain in the enclosures. In the presence of small zooplankton the young salmon were unable to increase in weight.

In contrast to the marked effect of diet on the growth of juvenile salmonids, the presence of 2.5 μg/l inorganic copper (10× ambient level) caused no observable effect on the growth or survival of the fish. These experiments indicate that factors (pollutants or natural events) which alter the spectrum of prey items available to young fish may be more important than the direct effect of physical or chemical factors on juvenile fish.

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Document Type: Research Article

Publication date: 1977-01-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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