Mathematical Description of Trout-Stream Fisheries

Autor:	Gaylord R. Alexander, Howard Gowing, Richard D. Clark
Rok vydání:	1980
Předmět:	education.field_of_study Biomass (ecology) biology Population Fishing Aquatic Science biology.organism_classification Fishery Trout Brown trout Fontinalis Salmo education Ecology Evolution Behavior and Systematics Salvelinus
Zdroj:	Transactions of the American Fisheries Society. 109:587-602
ISSN:	1548-8659 0002-8487
DOI:	10.1577/1548-8659(1980)109<587:mdotf>2.0.co;2
Popis:	A mathematical model of trout-stream fisheries was developed that can be used to evaluate a variety of fishing regulations. Density-dependent mortality was found in the first 2 years of life for each of the two brook trout (Salvelinus fontinalis) and three brown trout (Salmo trutta) populations studied in Michigan. Regression equations were used to describe the density-dependent relationships for modeling purposes. Equations were developed that used mortality, growth, and length-frequency information to calculate the number of fish in a population, number caught and harvested, number caught and released, number of deaths due to hooking mortality, number of natural deaths, and number recruited for any time period and age-group. Also, addition of a length-weight regression allowed equations to be developed for calculating yield in weight harvested, yield in weight caught and released, and gross biomass production for any time period and age-group. Effects of imposing different types of length limit...
Databáze:	OpenAIRE
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