Bill Ricker: An Appreciation (Developments in Environmental by David L.G. Noakes

By David L.G. Noakes

This e-book is the 1st whole biography of 1 of the founders of fishery technological know-how, William Edwin (Bill) Ricker (1908 - 2001), immortalized within the Ricker Curve. This booklet combines Bill’s personal memories with contributions from those that knew him and labored with him as a colleague in the course of his multifaceted occupation. In a piece of writing written presently prior to his dying, invoice provides his personal account of his profession and highbrow improvement.

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Extra info for Bill Ricker: An Appreciation (Developments in Environmental Biology of Fishes)

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Origin of stonefly names proposed by Ricker and collaborators. Perla 2: 5 – 19. Brigham Young University, Provo, Utah. Reprinted with additions and emendations, 1992. (176) 1978. J. E. Ricker]. Bias in using an age-length key to estimate agefrequency distributions. Journal of the Fisheries Research Board of Canada 35: 184 – 189. (177) 1978. On computing production. Limnology & Oceanography 23: 379 – 380. (178) 1978. E. T. V. Aro]. Causes of the decrease in size of pink salmon (Oncorhynchus gorbuscha).

S. F. Thompson of Seattle as Director of Investigations. I spent the year 1938 on its staff, along with Earle Foerster, Jack Kask, Roy Jackson, Clinton Atkinson, Edward Whitesel and others. During the summer of 1938 the tagging party at Hell’s Gate verified the pattern of difficult water levels there, and showed that some sockeye were permanently blocked and retreated to unsuitable tributaries downriver. This and similar work was continued in subsequent years, with the result that the commission built fishways at Hell’s Gate in 1945 – 1946, which eased the passage of salmon there.

It turned out that ocean growth greatly exceeded natural mortality in the ocean, for all species. Hence greatest weight of a catch is obtained by harvesting near the end of the life span, in or near the river of origin, not during either the penultimate or the last year of ocean life while growth is still rapid. There were also important losses from salmon falling out of ocean gillnets as they are lifted, and from sharks or fur seals taking salmon caught by gillnets or longlines. In coastal waters there is some loss to seals and sea lions, except in seining, and there is a major ‘shaker’ loss of undersized salmon that are hooked and damaged by a troll and then die after release.

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