The influence of water depths and inter-specific interactions on cover responses of juvenile Atlantic salmon

Autor:	R. J. Gibson, J. Erkinaro
Rok vydání:	2009
Předmět:	Ecology Aquatic animal Interspecific competition Aquatic Science Biology biology.organism_classification Aquatic organisms Fishery Water depth Brown trout Trout Juvenile Salmo Ecology Evolution Behavior and Systematics
Zdroj:	Ecology of Freshwater Fish. 18:629-639
ISSN:	1600-0633 0906-6691
DOI:	10.1111/j.1600-0633.2009.00380.x
Popis:	– The responses of salmon parr, Salmo salar, to instream cover, related to several water depths, were tested in an ellipsoidal stream tank. Opaque plastic covers, most of which were 20 cm in length and 16 cm high, were randomly distributed through the tank, occupying about 3% of the bottom area. Six salmon parr were used for each experiment. In experiments with channel depths of 40 cm, the proportion of salmon under covers was 36.4%, at 30 cm 60.7%, and at 20 cm, 79.4%. Presence of similar-sized brown trout, Salmo trutta, increased the use of covers in channels and greater use of the pool area by salmon. The salmon were completely dominated by the trout, making about four times more more aggressive than salmon. Our findings show that water depth itself provides cover for young salmon.
Databáze:	OpenAIRE
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