Age, growth and rate of food consumption in an upland population of the three-spined stickleback, Gasterosteus aculeatus L

Autor:	Robert J. Wootton, Judy R M Allen
Rok vydání:	1982
Předmět:	education.field_of_study Three-spined stickleback Population Food consumption First year of life Gasterosteus Aquatic Science Biology Body size biology.organism_classification Breed Fishery Animal science Growth rate education Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Fish Biology. 21:95-105
ISSN:	1095-8649 0022-1112
Popis:	In a population of Gasterosteus aculeatus living in an infertile, upland lake, the fish bred at the age of one year and few survived to breed again. The highest growth rates were achieved in the first month of life, but in comparison with other populations of G. aculeatus growth was slow during the autumn and ceased during the winter. But in spring and early summer, there was a spurt in the growth rate. Laboratory studies provided regression models for the prediction of the rate of food consumption from measurements of growth. The estimates of the consumption rate indicated the effect of the growth in body size and seasonal variations during the first year of life. It was estimated that a fish of mean length in the population consumed 3150 mg of food in a year in which it grew from 65.8 to 552.0 mg, with an overall gross growth efficiency of 15.4%. The study illustrated the integration of laboratory and field studies to obtain reasonable estimates of the rate of food consumption by fish throughout their first year of life.
Databáze:	OpenAIRE
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