Some aspects of the dynamics of populations important to the management of the commercial marine fisheries

Published on Mar 1, 1991in Bulletin of Mathematical Biology1.643
· DOI :10.1016/S0092-8240(05)80049-7
Milner B. Schaefer7
Estimated H-index: 7
(Inter-American Tropical Tuna Commission)
Summary The foregoing examples illustrate how the theory developed here may be employed to make estimates concerning the condition of a commercial marine fishery. The examples employed, although having perhaps as complete information as any available for this purpose, leave something to be desired. In particular, in both of these examples, very little or no data are available concerning intensity of fishing and abundance for the early period of development of the fishery, well before the maximum catches are reached. A great deal of precision would be added to the estimate if such information were available. We may emphasize, therefore, the desirability of obtaining detailed information on the total catch and catch-per-unit-of-effort from as early in the development of a commercial fishery as may be possible. Measurements of fishing mortality rates at more than one level of population would also be desirable, since they would make possible verification of the adequacy of the form of equation (13a) for describing the changes in population under the joint influences of growth and fishing. In order to apply the theory developed here to the tropical tuna fishery, it will be necessary to compile statistics of catch, abundance and intensity of fishing over a considerable series of years, beginning as early in the history of the fishery as possible. This task is well under way. It will also be necessary to obtain some estimate of the rate of fishing mortality, or to devise some other means of estimating the constant k 2 . Estimation of fishing mortality from tagging promises to be a difficult problem for the tunas. Exploration of other means of obtaining the relationship between U and P appears, therefore, to constitute an important line of investigation.
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