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

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

This publication particularly started in 1980 with our first microcomputer, an Apple II +. the nice worth of the Apple II + was once that shall we take the pc courses we were development on mainframe and mini-computers, and lead them to to be had to the various fisheries biologists who additionally had Apple II + 's. approximately 6 months once we acquired our first Apple, John Glaister got here via Vancouver and observed what we have been doing and learned that his enterprise (New South Wales kingdom Fisheries) had an analogous apparatus and will run a similar courses. John prepared a coaching path in Australia the place we confirmed approximately 25 Australian fisheries biologists how you can use microcomputers to do many ordinary fisheries analyses. within the strategy of organizing this and sub­ sequent classes we built a chain of lecture notes. over the past 10 years those notes have advanced into the chapters of this book.

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Extra info for Quantitative Fisheries Stock Assessment: Choice, Dynamics and Uncertainty

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The fisheries of the world are managed for the benefit of man. Certainly some fish are protected for reasons of conservation, but by definition a fishery means harvesting fish. With the exception of overzealous government press agents, few people argue that fisheries take place for the good of the fish. Given that we are managing a fishery for the benefit of mankind, how do we evaluate how well we are doing? To answer this question, we must first endeavor to define what we really want to achieve with management - we must be clear about what we mean by the benefit of mankind.

The points allocated to each use are unimportant so long as the points are highest for escapement and lowest for sport and commercial catch. Although such a score card might nominally meet the requirements of the priority list, it does not provide total guidance to a manager. How does he trade-off between sport and commercial catch? If a total run of 900,000 came in, his score would be maximized by assigning all the fish to escapement and leaving no fish for the Indians; however, allowing an Indian harvest of 100,000 and an escapement of 800,000 would hardly endanger the long-term health of the stock and would certainly be beneficial for the Indians.

A typical salmon fishery, such as the Skeena River sockeye fishery, might involve several hundred boats, each worth $20,000 to $150,000, and employ perhaps a thousand people during the harvest. The fishery could be replaced by a few dozen people operating a few vessels or perhaps some form of fish traps. The profits from the "efficient" fishery could be used to pay those displaced from the fishery more money than they earned while fishing, and the national economy would be much better off because fewer foreign imports would be required to run the vessels.

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