Size-dependent energy storage and winter mortality of perch

Autor:	Lisa Heermann, Carin Magnhagen, L.-O. Eriksson, Jost Borcherding
Rok vydání:	2009
Předmět:	Perch Biomass (ecology) Ecology biology Glycogen Mortality rate High mortality Energy reserves Size dependent Aquatic Science biology.organism_classification Energy storage chemistry.chemical_compound chemistry Ecology Evolution Behavior and Systematics
Zdroj:	Ecology of Freshwater Fish. 18:560-571
ISSN:	1600-0633 0906-6691
DOI:	10.1111/j.1600-0633.2009.00371.x
Popis:	– Size is a crucial factor affecting the survival of fish during winter. Pond and laboratory experiments with three size classes of perch (small: 40–70 mm, medium: 71–100 mm, large: 101–186 mm) revealed that the feeding history of perch prior to winter is reflected in the amount and type of accumulated energy reserves. The minimal amount of reserves was 2% of the perch’s biomass for fat and 9% for protein. An increase in glycogen levels either reflected mobilisation of energy in the body when perch were starving or an increase in accumulated energy over winter. In the laboratory, only the smallest perch suffered from high mortality rates, even if all were fed with low amounts of food. However, feeding the fish reduced the mortality rate after a certain time lag. Size-selective mortality rates occurred in the pond experiments as well. Small perch which survived the winter were able to rebuild their energy stores.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c1fb9c7028ee7405ad84b66552fa5792 https://doi.org/10.1111/j.1600-0633.2009.00371.x Zobrazit plný text záznamu Plný text