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Habitat selection of juvenile Atlantic cod, Gadus morhua and turbidity

Habitat selection of juvenile Atlantic cod, Gadus morhua and turbidity. We examined the effects of turbidity on habitat preference of juvenile Atlantic cod in the laboratory. In the first experiment, we compared three turbidity levels of kaolin (2, 7 and 15 beam attenuation m-1). In the second experiment, we looked at the effect of turbidity media (kaolin vs algae).

Although cod preferred intermediate kaolin turbidity over clear water, most combinations of turbidity did not influence habitat preference. Similarly, algae did not influence habitat preference by cod. We suggest that factors such as food availability and predation risk have more important effects on habitat preference by juvenile cod than differences in turbidity per se.

Reported by

Aquatic Behavioural Ecology Group
Pb 7800, HiB
Bergen
Norway
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