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Changes in age and maturity of anadromous whitefish (
The maturation of anadromous whitefish (Coregonus lavaretus) was analysed from samples taken from commercial coastal fishing in 1998–2014 in the Gulf of Bothnia. Whitefish matured at a younger age from year to year. The proportion of older (5–12 sea years) mature males decreased from 79% to 39% in the northern Gulf of Bothnia (66°N–64°N) and from 76% to 14% in southern (64°N–60°30'N) during the study period. At the same time, the proportion of young males (2–4 sea years) increased. Whitefish matured younger: the proportion of mature fish at age four increased in both the north and south among females (13% → 98%; 6% → 85%) and males (68% → 99%; 29% → 89%). The catch length of four-year-old fish increased during the study period in both sexes. In contrast, the length of six-year-old females decreased from year to year. Sea surface temperatures increased during the study period, and were possibly associated with a decrease in the age of maturation and faster growth.
Auteurs du document :
Lari Veneranta, Irma Kallio-Nyberg, Irma Saloniemi, Erkki JokikokkoObtenir le document :
EDP SciencesMots clés :
Anadromous whitefish, maturation, temperature, Baltic SeaThème (issu du Text Mining) :
MILIEU NATURELDate :
2021-04-09Format :
text/xmlSource :
https://doi.org/10.1051/alr/2021007Langue :
AnglaisTélécharger les documents :
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https://www.documentation.eauetbiodiversite.fr/notice/changes-in-age-and-maturity-of-anadromous-whitefish0
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Ce portail, créé et géré par l'Office International de l'Eau (OiEau), est géré avec l'appui de l’Office français de la biodiversité (OFB)
Ce portail, créé et géré par l'Office International de l'Eau (OiEAU), est géré avec l'appui de l’Office français de la biodiversité (OFB)