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Sunday, August 9, 2020 | History

2 edition of Tuberculosis in Pacific salmon and steelhead trout found in the catalog.

Tuberculosis in Pacific salmon and steelhead trout

Wood, James W.

Tuberculosis in Pacific salmon and steelhead trout

by Wood, James W.

  • 362 Want to read
  • 23 Currently reading

Published by Fish Commission of Oregon in Portland .
Written in English

    Subjects:
  • Pacific salmon -- Diseases -- Oregon.,
  • Steelhead (Fish) -- Diseases -- Oregon.,
  • Tuberculosis in animals -- Oregon.

  • About the Edition

    Tuberculosis in salmonoid fishes was first observed in the 1952 run of fall chinook salmon (Oncorhynchus tshawytscha) returning to the Bonneville Hatchery of the Oregon Fish Commission. In the studies reported here, tuberculosis was found not only in adult spring chinook but in silver salmon (0. kisutch), blueback salmon (0. nerka), and in anadromous and resident strains of rainbow trout (Salmo gairdnerii). Advanced tuberculosis was found in salmonoid fishes held in fresh water for two years or longer, as well as in adults returning from the sea. Lesions were most frequently observed in the liver, and varied in size from small miliary tubercles to huge necrotic areas, filled with characteristic acid-fast bacilli. The typical bacilli were found in stained smears from the kidney, heart, musculature, brain, intestines, pyloric caeca, and roe of infected fish. The disease was originally observed in sexually-underdeveloped fish, and there is indication that it interferes with sexual maturation. It was found that tuberculosis in marked salmon known to be of hatchery origin was extremely high - in some cases 100 percent. Tuberculosis was absent in the small number of silver and chum salmon examined which were known to be the progeny from natural spawning. It is suggested that dissemination of the disease may be due to fish-cultural practices such as the feeding of untreated carcasses and the viscera from tuberculous fish. Since acid-fast bacilli were found in the roe of some fish, it is also suggested that the disease may be transmitted to healthy eggs during the process of fertilization. Tuberculous adult spring chinook were found less capable of surviving to maturity after they reached the spawning grounds than were non-infected fish. It is likely that tuberculosis also influences the ability of salmon to survive during earlier stages of their life history. The incidence of tuberculosis in adult spring chinook entering the Dexter holding ponds on the Middle Fork of the Willamette River in 1955 and 1956 was 8.7 and 6.1 percent, respectively. The increase in incidence to 58.8 percent in 1957 is attributed to the increased dependency of the run on artificial propagation necessitated by the construction of Lookout Point Dam. Among chinook caught in the Columbia River gill-net fishery in. February and in May 1956, 12.3 and 10.5 percent, respectively, of those examined were tuberculous. Although these are spring chinook, it is believed that hatchery reared fall chinook also entered the catch, especially during May, and may have contributed to the number of tuberculous fish taken.

    Edition Notes

    StatementJames W. Wood and Erling J. Ordal.
    SeriesContribution / Oregon Fish Commission -- no. 25., Contribution (Oregon. Fish Commission) -- no. 25.
    ContributionsOrdal, Erling Josef, 1906-, Oregon. Fish Commission.
    The Physical Object
    Pagination38 p. :
    Number of Pages38
    ID Numbers
    Open LibraryOL16120177M

    His steelhead, smallmouth, and trout flies have been published in books, magazines, and online. He has written articles for international, national, and regional fly fishing magazines. Grapefruit Leech: With its chartreuse and pink head, the grapefruit leech is one of the most reliable Midwest swung fly patterns.   Five kinds of salmon live in rivers along the Pacific Coast: the chinook (or king salmon), the coho (or silver salmon), the sockeye, pink (or humback) and chum (or dog) salmon. This coloring book talks about these fish and the steelhead (which is a type of rainbow trout) and is designed for anyone interested in learning about fish.

    In fact, five species of Pacific salmon and steelhead are native to California, were once abundant here, and were a significant part of the indigenous cultures. And while dams, fishing, development, pollution, and erosion have taken a toll, small populations can still be found today in coastal rivers and creeks up and down the state. 10% off-Gently used-OUT OF PRINT- NORTHEAST TROUT, SALMON, & STEELHEAD STREAMS: EVERY RIVER HAS A STORY by John B. Mordock Sale price $14 35 $ Regular price $15 95 $ Save $

    chinook salmon, and ages and steethead trout predominated in the samples. The majority of sockeye, chum, pink, and coho salmon, and steelhead trout were maturing fish. Most chinook salmon were probably immature. Because the samples included a high proportion ofmaturing fish that were caught relatively late in the season, the fish in the. ISBN: OCLC Number: Notes: Spine title: Pacific salmon. Description: pages: illustrations ; 32 cm.


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Tuberculosis in Pacific salmon and steelhead trout by Wood, James W. Download PDF EPUB FB2

Tuberculosis in salmonoid fishes was first observed in the run of fall chinook salmon (Oncorhynchus tshawytscha) returning to the Bonneville Hatchery of the Oregon Fish Commission. In the studies reported here, tuberculosis was found not only in adult spring chinook but in silver salmon (0. kisutch), blueback salmon (0.

nerka), and in. "A highly readable and dilligently researched up-to-date survey of what is known and not known about Pacific salmon, steelhead, and cutthroat trout. This book is timely too, since unique policy discussions are currently taking place focusing on the protection and management of these noble fish in the Northwest."―Salmon Trout Steelheader/5(15).

This book is a comprehensive summary and interpretation of the research published on the ocean ecology of six species of Pacific salmon (Pink Salmon, Chum Salmon, Sockeye Salmon, Coho Salmon, Chinook Salmon, and Cherry Salmon), steelhead, and coastal Cutthroat Trout by researchers in Canada, Japan, Korea, Russia, and the United States.

The book then follows salmon on their amazing homeward migration from the open ocean, through the complex coastal waters, upstream to the precise location where they were spawned years earlier. This thorough survey should be on the shelf of everyone with a professional or personal interest in Pacific salmon and trout.

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Pacific Salmon / Steelhead Identification and Lifecycle Salmon live the majority of their lives in the Ocean (Marine phase). When Salmon are ready to spawn and return to the fresh water they begin to make some dramatic transitions in their shape and color.

Steelhead usually lack the pink stripe and have chrome-colored sides. Unlike other Pacific Salmon, Rainbow Trout and Steelhead do not necessarily die after spawning (they may spawn as many as four times).

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The Ocean Ecology of Pacific Salmon and Trout provides up-to-date scientific information on the ocean life of Pacific salmon as well as discussions about future research needs. It will be an invaluable source of information and a standard reference for scientists, teachers, students, and anyone interested in Pacific salmon.

The Behavior and Ecology of Pacific Salmon and Trout introduces salmon and trout as a group, with a brief description of each species, and compares them to other fishes.

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The largest Steelhead can weigh over 30 lbs and measure 45 inches, but most weigh between eight and 20 lbs. A Non-Anadromous Variation: Rainbow Trout. As Sockeye have a freshwater-only variation, the Kokannee, Steelhead have the Rainbow trout, who never see the ocean.

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