Download Quantitative Fisheries Stock Assessment: Choice, Dynamics by Ray Hilborn, Carl J. Walters (auth.) PDF

By Ray Hilborn, Carl J. Walters (auth.)

This ebook fairly begun in 1980 with our first microcomputer, an Apple II +. the good worth of the Apple II + was once that shall we take the pc courses we have been construction on mainframe and mini-computers, and cause them to to be had to the various fisheries biologists who additionally had Apple II + 's. approximately 6 months once we bought our first Apple, John Glaister got here via Vancouver and observed what we have been doing and discovered that his organization (New South Wales kingdom Fisheries) had an analogous apparatus and will run an analogous courses. John equipped a coaching path in Australia the place we confirmed approximately 25 Australian fisheries biologists the best way to use microcomputers to do many regular fisheries analyses. within the means of organizing this and sub­ sequent classes we constructed a chain of lecture notes. over the past 10 years those notes have developed into the chapters of this book.

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Example text

0. 00 future, high discount rates will demand that the increases in future average catch be very large in order to justify reduced catch in the near term. If, however, the implications of high discount rates seem surprising, consider the implications of no discounting. Let us assume we could increase the yield of a stock I % by a one-time investment of a large sum of money, and we do our value calculations for this investment without any discounting. Imagine that a salmon passage over a falls could be built at a cost of 1 million dollars and there would be no future maintenance expenses.

It also involves a recognition that stock assessment biologists must educate managers and decision makers to ask appropriate questions and to think of the dynamic response of fisheries to change. Bibliographic Notes This chapter has provided our view of the role of stock assessment. Other views can be found in Gulland (1974, 1983). McHugh (1984), Rothschild (1986). and Royce (1987). Details of the Peruvian anchoveta fishery can be found in Pauly and Tsukayama (1987) and Glantz (1979). Saville and Bailey (1980) and Saetersdal (1980) discuss the North Sea herring.

2. Alternative Management Objectives We like to group the various and sometimes conflicting objectives of fisheries management into four general areas: biological, economic, recre- 24/lntroduction ational, and social. There may be some fisheries where only one of these is important, but we suspect that, in most cases, management is concerned with two or more general objectives and the critical problem is how to trade off between them. But before discussing any tradeoffs, let us look at the features of each general type of objective.

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