Titlebook: Quantitative Fisheries Stock Assessment; Choice, Dynamics and Ray Hilborn,Carl J. Walters Book 1992 Springer Science+Business Media Dordrec

不真

Nuance

阐释

Harvest Strategies and Tactics fish reach the spawning grounds. This type of harvest strategy is also known as a constant-stock-size strategy. Another type of harvest strategy involves taking a constant catch, or fixed quota, from the stock every year. In the Tasmanian abalone fishery, for many years every licensed fisherman was

使痛苦

puter programs we had been building on mainframe and mini-computers, and make them available to the many fisheries biologists who also had Apple II + ‘s. About 6 months after we got our first Apple, John Glaister came through Vancouver and saw what we were doing and realized that his agency (New Sou

扫兴

Virtual Population Analysiss. These methods are covered in this chapter. The second class of catch-at-age methods rely on formal statistical models and we consider these in the next chapter (Chapter 11) entitled “Statistical Catch-at-Age Methods.” Megrey (1989) provides an excellent review of all of these methods

说明

Analysis of Body Size and Growth Dataathered simply because they are cheap and easy to get, and might contain useful information about longevity, mortality, and variation in recruitment rates (e.g., presence of strong modes in the length frequency distribution)

讲个故事逗他

Role of Stock Assessment in Fisheries Managemente sense to engage in the risky and often embarrassing business of quantitative prediction in settings where there are no management choices to be made in the first place, except perhaps as an aid to scientific thinking and hypothesis formulation

过多

Behavior of Exploited Populationsion of modern fisheries. We then discuss some basic ecological theory about the dynamic behavior of populations to provide a framework for later discussion about specific elements in the life history of fish

HARD

CHURL

Depletion Estimates of Population Size and Turnoverct counts and mark recapture statistics. We devote two chapters to vpa and catch-at-age analysis. This chapter discusses the fourth of these approaches, depletion estimates, which under some circumstances can be substantially cheaper and more effective than the others