Growth Rates and Size Distributions of First-year Smallmouth Bass Populations: Some Conclusions from Experiments and a Model

Autor:	D. L. Deangelis, C. C. Coutant
Rok vydání:	1979
Předmět:	Toxicology Bass (fish) food.ingredient food Animal science Micropterus Aquatic Science Biology biology.organism_classification Ecology Evolution Behavior and Systematics Aquatic organisms Rate of growth
Zdroj:	Transactions of the American Fisheries Society. 108:137-141
ISSN:	1548-8659 0002-8487
DOI:	10.1577/1548-8659(1979)108<137:grasdo>2.0.co;2
Popis:	Growth rates of populations of first-year smallmouth bass (Micropterus dolomieui Lacepede) were studied during the first few weeks of life at temperatures ranging from 15.2 to 32.5 C. In all cases, the average length of fish in each group increased linearly with time, t, in a range from 10 to 30 mm. The variances about these mean lengths increased approximately as t2. A partial differential equation model can be useful in expressing the dynamics of populations in which size distributions are taken into consideration. Applied to our experiment, this type of model shows that both of the observed length-versus-time phenomena are expected if the rates of increase of length of fish are independent of length and that these rates for individual fish are normally distributed about some mean rate of growth. The variance of individual growth rates needed to produce the observed length-versus-time data can be calculated from the model.
Databáze:	OpenAIRE
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