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Pen Rearing And Imprinting Of Fall Chinook Salmon 1985 Annual Report
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Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon, 1985 Annual Report by :
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon, 1985 Annual Report written by and published by . This book was released on 1985 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Upriver bright fall chinook salmon (Oncorhynchus tshawytscha) are being reared in a backwater and a pond along John Day Reservoir to evaluate the benefits of rearing fish and releasing them off-station compared to traditional hatchery procedures. Fish reared in net pens at a density/feeding combination judged to be the economic optimum of those used during 1984 rearing trials exhibited good growth and smolt development. Size of fish averaged 112 fish/lb (4.0g/fish), ATPase activities ranged from 16.4 to 29.5 micromoles Pi/mg prot/hr at release and total mortality of fish was low among pens, ranging from 0.3 to 1.1%. Poor growth and smolt development was observed in fish reared in a large barrier net, especially during the initial two weeks after stocking. In addition, mortality of fish in the barrier net was high (49%) in relation to any of the other treatments tested thus far. The combined effects of generally poor condition of fish at stocking, low zooplankton densities during the initial two weeks of rearing, and losses to predation were thought to be the primary causes of the slow growth rates and high mortality. Unfed fish in pens utilized the available natural food base, but zooplankton densities were apparently not sufficient for growth, and may have been marginal for sustenance, especially at higher density. ATPase activities at release were significantly higher in low-density pens than in higher density pens, but development at all densities was retarded when compared with ATPase activities of fed fish. Preliminary cost estimates for producing fish-using the rearing strategies developed in the current pen-rearing study compared favorably with the average costs of rearing salmonids in a Northwest hatchery.
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by : Jerry F. Novotny
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by Jerry F. Novotny and published by . This book was released on 1985 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Library Uses of Rapid Copiers written by and published by . This book was released on 1958 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by :
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by and published by . This book was released on 1985 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by :
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by : Jerry F. Novotny
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by Jerry F. Novotny and published by . This book was released on 1986 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by : William R. Nelson
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by William R. Nelson and published by . This book was released on 1987 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon, 1984 Annual Report by :
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon, 1984 Annual Report written by and published by . This book was released on 1985 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by : John W. Beeman
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by John W. Beeman and published by . This book was released on 1990 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Progressive Fish Culturist by : U.S. Fish and Wildlife Service
Download or read book The Progressive Fish Culturist written by U.S. Fish and Wildlife Service and published by . This book was released on 1989 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by : Jerry F. Novotny
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by Jerry F. Novotny and published by . This book was released on 1983 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Progressive Fish-culturist written by and published by . This book was released on 1988 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon, 1983 Annual Report by :
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon, 1983 Annual Report written by and published by . This book was released on 1984 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backwaters and protected sites located along the Columbia River between John Day and Priest Rapids dams, and the lower reaches of the Umatilla, Yakima, and Snake rivers were surveyed to determine their suitability for experimental rearing of age-0 fall (upriver bright) chinook salmon. All but eight potential study sites observed were judged as unusable based on criteria which included depth, area, accessibility, potential water level and temperature fluctuations, entrance-access to the river, public use, and obvious water quality problems. These eight sites were then thoroughly evaluated to determine suitability for rearing studies, using water quality and biological data to supplement physical observations. The criteria used in the final selection of rearing sites included an assessment of water source, depth, temperature, and quality, proximity to natural spawning sites, ease of adult capture, and benthos and zooplankton abundance. Two sites were selected as satisfying the most criteria for experimental rearing studies: Rock Creek (river km 337) and Social Security Pond (river km 468). All other sites surveyed were ranked as either less desirable, or unusable for these studies.
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon, 1987 Annual Report by :
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon, 1987 Annual Report written by and published by . This book was released on 1987 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1987 field season was the third and final year fox the rearing and release of juvenile upriver bright chinook salmon (Oncorhynchus tshawytscha) at off-station sites. Disease problems in the hatchery where fish for the study were spawned and hatched resulted in the movement of trials to Drano Lake, a backwater located near river km 261, 105 km downstream of Rock Creek and 205 km downstream of Social Security Pond, the two off-station rearing sites where studies were completed in 1984--86. Fish in fed treatments were successfully reared in pens during March, April, and May and were released in the third week of May at a mean size of about 4,5 g (l00/lb). Growth and physiological development of fish reared In Drano Lake were only slightly faster than observed in hatchery controls over much of the rearing period. However, during the final two weeks of rearing, ATPase activities and growth of the fish reared in pens increased, and at release the fed treatments tested in Drano Lake were significantly larger, and physiological development was significantly ahead of hatchery controls. The health and condition of fed fish in Drano Lake remained good throughout the study and survival was high (>99%) in all treatments; no pathogens were detected in any of the groups. However, infectious hematopoietic necrosis was diagnosed among upriver brights being reared in the hatchery; the latter group was destroyed on May 21. Unfed fish grew poorly throughout the rearing period with little or no detectable growth in the two higher density treatments and mean growth of less than 0.3 g in the lower density. Survival of fish reared at the higher density was poor, while survival in the two lower density treatments was much better. Densities tested in pen rearing trials have been much lower than the maximum recommended in terms of available rearing spare. However, during periods of limited water exchange the highest density tested so fax (4.13 kg/ma) would be above the recommended maximum for the rearing conditions encountered In the off-station rearing sites. Costs of rearing fish are dramatically affected by densities. Alternate rearing facilities, including polyethylene and wooden walkway framing, are initially a higher investment, but may prove to be more desirable than the aluminum frames tested during this study.
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon by : John W. Beeman
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon written by John W. Beeman and published by . This book was released on 1994 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pen Rearing and Imprinting of Fall Chinook Salmon, 1989 Annual Report by :
Download or read book Pen Rearing and Imprinting of Fall Chinook Salmon, 1989 Annual Report written by and published by . This book was released on 1990 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this project is to compare net-pen rearing methods to traditional hatchery methods of rearing upriver bright fall chinook salmon (Oncorhynchus tshawvtscha). Fish were reared at several densities in net pens at three Columbia River backwater sites during 1984-1987, and in a barrier net at one site during 1984-1986; methods included both fed and unfed treatments. The purpose of this report is to summarize the results obtained from the unfed treatments and the current return of adults from all fed treatments and the barrier net. Zooplankton were the primary food item of unfed fish. Fish reared in net pens utilized insects colonizing the nets as an additional food source, whereas those reared in the barrier net did not. Growth and production of fish reared in the unfed treatments were low. Instantaneous growth rates of unfed fish were much lower than those of the fed treatments and hatchery controls except when zooplankton densities were high and chironomid larvae were important in the diet of unfed fish reared in pens. Only fish in the barrier net treatment resulted in consistent net gains in growth and production over the rearing periods. Adult returns of fish from all fed and unfed treatments are lower than those of control fish reared at the hatchery. Returns appear to be inversely related to rearing density. Even though adult returns are lower than those of traditional hatchery methods, a cost-benefit analysis, as return data becomes more complete, may prove these methods to be an economical means of expanding current hatchery production, particularly if thinning releases were used.
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