Seasonal variation in marine growth of sea trout, Salmo trutta, in coastal Skagerrak

Autor:	Esben Moland Olsen, B. Jonsson, Jan Henrik Simonsen, Jan Atle Knutsen, Halvor Knutsen
Rok vydání:	2006
Předmět:	Ecology biology Juvenile fish STREAMS Aquatic Science Seasonality biology.organism_classification medicine.disease Trade-off Fishery Fresh water medicine Sea trout Fish Salmo Ecology Evolution Behavior and Systematics
Zdroj:	Ecology of Freshwater Fish. 15:446-452
ISSN:	1600-0633 0906-6691
Popis:	Sea trout (Salmo trutta) originating from small coastal streams can be found at sea throughout the year, in contrast to conspecifics from larger rivers, which typically spend the autumn and winter in fresh water. Such an extended marine stay has been observed in coastal Skagerrak. We studied the seasonal variation in marine growth of Skagerrak sea trout based on scale increment patterns and body lengths of 563 individuals captured at sea. Growth, measured as increased body length, was rapid during summer while there was no evidence for continued growth during autumn and winter. Growth decreased with increasing age of the fish. Our results suggest that coastal Skagerrak is an important feeding area for sea trout during summer, and that an extended marine stay during autumn and winter may have trade-off benefits other than somatic growth. Alternative benefits might be increased winter survival and decreased migratory costs of juvenile fish.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4ada8e9e678ffdad5386a71ef68f5515 https://doi.org/10.1111/j.1600-0633.2006.00176.x Zobrazit plný text záznamu Plný text