Trends in spawning populations of Pacific anadromous salmonids
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Trends in spawning populations of Pacific anadromous salmonids

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Published by U.S. Dept. of the Interior, Fish and Wildlife Service in Washington, D.C .
Written in English


  • Pacific salmon -- Spawning.,
  • Fish populations.,
  • Fishes -- Spawning.

Book details:

Edition Notes

Bibliography: p. 23-25.

Statementby Gregory W. Konkel, John D. McIntyre.
SeriesFish and wildlife technical report ;, 9, Fish and wildlife technical report ;, no. 9.
ContributionsMcIntyre, John D.
LC ClassificationsQL638.S2 K637 1987
The Physical Object
Paginationiii, 25 p. :
Number of Pages25
ID Numbers
Open LibraryOL2493202M
LC Control Number87600119

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Abstract. In this paper, I examine the role of competition and predation in the decline of Pacific salmon and steelhead (Oncorhynchus spp.) populations along the Pacific coast of North studies have clearly established the role of competition and predation in anadromous population declines, especially in marine by: anadromous salmonid populations in Blue Creek, a fourth order lower Klamath River tributary, during This project assessed adult escapement and spawning activity during the fall months via direct observation. The resulting information provided a means of assessing escapement estimates and spawning trends of Blue Creek salmonids. This is the first publication to collect, standardize, and recommend a scientifically rigorous set of field protocols for monitoring and assessing salmon and trout populations. Includes five additional techniques that can be used with any of the 13 principle methods to supplement information gathered. Populations of some Pacific and Atlantic salmon species contain a mixture of anadromous and non-anadromous individuals. Because of an increased interest in potential demographic and genetic.

Anadromous salmonids express remarkable levels of life history diversity the obligate anadromous Pacific salmon species move definitively to marine where a spawning population exists, and. No Comments on Salmonid Fisheries Freshwater Habitat Management No Comments on Salmonid Fisheries Freshwater Habitat Management. Vernon A. Pepper, Laurence W. Crim, in Developments in Aquaculture and Fisheries Science, Review of Current Practices and New Trends. The goals of a program for hatchery propagation of salmonids to be planted into the wild are very different from the profit motive of an aquaculture program (Allendorf and Ryman ).As stated by Ferris and Berg (), sound management decisions . other anadromous fish of the Elwha River watershed. The ecological habitat of each salmon species includes their adult range in the ocean and the specific parts of the river, and its tributaries, that are critical spawning habitat. TIME: One class period MATERIALS: Lesson Habitat Requirements for Pacific

  On return into freshwater during the spawning migration, adult migrants recall the imprinted chemical cues and swim toward them. In this manner, anadromous salmonids, and perhaps other species of anadromous fish (e.g., Dodson and Leggett ; Sahafi ), can locate their natal sites with high precision (Quinn ). Biased loss of habitats – a change in selective regime. Historically, anadromous salmonids utilized freshwater habitats in the western United States (excluding Alaska) from the coast inland to Montana and Nevada totaling nearly km -scale blockages in this region have left only about 56% of that area (∼ km 2) accessible (Fig. 1). Most salmon are anadromous, a term which comes from the Greek anadromos, meaning "running upward". Anadromous fish grow up mostly in the saltwater in oceans. When they have matured they migrate or "run up" freshwater rivers to spawn in what is called the salmon run.. Anadromous salmon are Northern Hemisphere fish that spend their ocean phase in either the Atlantic Ocean or the Pacific . The ESA allows listing of 'distinct population segments' of vertebrates as well as named species and subspecies. The policy of the NMFS on this issue for anadromous Pacific salmonids is that a population will be considered 'distinct' for purposes of the ESA if it represents an evolutionarily significant unit (ESU) of the species as a whole.