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A Generalized Computer Simulation Model for Fish Population Studies
Author(s) -
Walters Carl J.
Publication year - 1969
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1969)98[505:agcsmf]2.0.co;2
Subject(s) - fishing , fishery , population dynamics of fisheries , population model , population , stock (firearms) , yield (engineering) , mathematics , fecundity , fish stock , statistics , arctic , dominance (genetics) , fish <actinopterygii> , biology , ecology , demography , geography , biochemistry , materials science , archaeology , sociology , gene , metallurgy
A generalized computer model for fish population simulation and maximum yield determination is described. The model utilizes age‐specific natural mortality rates, growth rates, relative fecundities, and any desired stock‐recruitment relationship. Best harvest strategies are found by treating long‐term yield as a response surface on the set of age‐ and year‐specific fishing rates. The model is illustrated using data on arctic cod, stream brook trout, and on a hypothetical population with strong age‐class dominance. Best predicted management strategies include periodic harvest when age at entry to the fishery cannot be controlled, but maximum yield is usually obtained with constant fishing rate.