Lipid status and feeding habits of salmonid juveniles in the year preceding seaward migration as factors controlling their future smoltification

Autor:	Nina N. Nemova, D. S. Pavlov, O. B. Vasil’eva, Zinaida A. Nefedova, E. A. Kirillova, P. I. Kirillov
Rok vydání:	2007
Předmět:	Fishery endocrine system biology Lipid level Oncorhynchus Aquatic Science General Agricultural and Biological Sciences biology.organism_classification Parasalmo mykiss Smoltification Trophic level
Zdroj:	Journal of Ichthyology. 47:241-245
ISSN:	1555-6425 0032-9452
DOI:	10.1134/s003294520703006x
Popis:	Juveniles of coho salmon Oncorhynchus kisutch (Walb.) and mykiss Parasalmo mykiss (Walbaum) of the same age (1+) become differentiated as early as eight months before smoltification and seaward migration by their lipid level, feeding habits, and size and weight parameters. It is found that juveniles of coho salmon and mykiss with a high lipid status have a greater (on average) length and weight and consume more calorific food items. The juveniles with a lower lipid status have a lower length and weight and consume less calorific organisms. It is presumed that a considerable part of juveniles with a high lipid status will migrate seaward next year. The role of the trophic factor in development of this differentiation and, accordingly, in determination of smoltification dates is discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::59d7e3c3e4efb0bdc944430e4929f34b https://doi.org/10.1134/s003294520703006x Zobrazit plný text záznamu Full text from SpringerLink