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Yield Estimation for Spatially Connected Populations: An Example of Surface and Longline Fisheries for Yellowfin Tuna
Author(s) -
Hilborn Ray
Publication year - 1989
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1989)009<0402:yefscp>2.3.co;2
Subject(s) - yellowfin tuna , fishery , fishing , tuna , stock (firearms) , thunnus , population , maximum sustainable yield , environmental science , oceanography , geography , fisheries management , biology , geology , fish <actinopterygii> , demography , archaeology , sociology
A general model of total yield for a size‐structured population model including a stock‐recruitment relationship, exchange between stocks, and multiple fishing gears is presented. The interaction between surface purse‐seine and pole‐and‐line fisheries and deepwater longline stocks of yellowfin tuna Thunnus albacares is considered as an example. Biomass and dollar yield are maximized by a longline fishery if the deepwater and surface fisheries take place on a homogeneous stock, but if the deepwater and surface stocks are somewhat discrete, biomass yield is maximized by a combination of purse‐seine and longline gears.