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Equilibrium Yield And Management Of Cutthroat Trout In Yellowstone Lake
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Book Synopsis Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake by : Norman Gustaf Benson
Download or read book Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake written by Norman Gustaf Benson and published by . This book was released on 1963 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equilibrium yield of the cutthroat trout, Salmo clarki lewisi Girard, in Yellowstone Lake, Wyo., is determined from data on catch and spawning runs from 1945 to 1961. Changes in growth rate, spawning runs, mortality rates, and year-class strength are related to differences in total catch. Three stages of exploitation of the stock are defined and the maximum safe catch or equilibrium yield is estimated at 325,000 trout. Management of the sport fishery according to equilibrium yield is discussed with reference to regulations, distribution of fishing pressure, planting, and interspecific competition. The Yellowstone River fishery is treated briefly.
Book Synopsis Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake by : Norman Gustaf Benson
Download or read book Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake written by Norman Gustaf Benson and published by . This book was released on 1962 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake [with List of Literature Cited by :
Download or read book Equilibrium Yield and Management of Cutthroat Trout in Yellowstone Lake [with List of Literature Cited written by and published by . This book was released on 1963 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Equilibrium Yield and Management of Cutthroat Trout in Yelloustone Lake by : Norman G. Benson
Download or read book Equilibrium Yield and Management of Cutthroat Trout in Yelloustone Lake written by Norman G. Benson and published by . This book was released on 1962 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluctuations in Age Composition and Growth Rate of Cutthroat Trout in Yellowstone Lake by : Ross V. Bulkley
Download or read book Fluctuations in Age Composition and Growth Rate of Cutthroat Trout in Yellowstone Lake written by Ross V. Bulkley and published by . This book was released on 1961 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Age composition, growth rate, and year-class strength of Yellowstone Lake cutthroat trout from collections made in 1948 and from 1950 to 1959 are analyzed to relate total catch changes in age composition and growth rate. An increase in growth rate of fish fully recruited to the fishery and a decrease in percentages of fish belonging to age groups VI and VII are attributed to an increase in fishing pressure. Mean age of the catch varied with year-length of the catch has remained high, suggesting that production is more efficient now than in past years. Maximum equilibrium yield may be near. If the catch continues to increase at the present rate, it may become excessive within the next few years.
Download or read book Research Report written by and published by . This book was released on 1961 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecology of Daphnia in Bull Shoals Reservoir by : Richard L. Applegate
Download or read book Ecology of Daphnia in Bull Shoals Reservoir written by Richard L. Applegate and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Life histories of Daphnia galeata mendotae, D. retrocurva, D. parvula, D. ambigua, and D. schoedleri are compared with year class strength and food of threadfin shad in Bull Shoals Reservoir from 1965 to 1967. Maximum population density of daphnids was in April, May, and June. Populations declined to insignificant densities throughout the rest of the year. Declines coincided with the inclusion of Daphnia in the diets of threadfin shad smaller than 14 mm. Declines in the summer of 1967 coincided with both young shad predation and high Leptodora kindtii density. Population changes associated with declining year class strength of threadfin shad were an increase of the large D. schoedleri and Leptodora kindtii from nondetectable or trace densities to relatively large populations, and increase from nondetectable densities of daphnids in the summer to detectable densities, and a twofold to threefold increase in the summer standing crops of Bosmina longirostris.
Book Synopsis Research Report - Bureau of Sport Fisheries and Wildlife by : United States. Bureau of Sport Fisheries and Wildlife
Download or read book Research Report - Bureau of Sport Fisheries and Wildlife written by United States. Bureau of Sport Fisheries and Wildlife and published by . This book was released on 1941 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Predatory Behavior of Some Shore Fishes in the Gulf of California by : Edmund S. Hobson
Download or read book Predatory Behavior of Some Shore Fishes in the Gulf of California written by Edmund S. Hobson and published by . This book was released on 1968 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study area in the Bahia de Palmas, was established and predatory behavior in some Gulf of California shore fishes was studied to define certain general activity patterns.
Book Synopsis Bibliography on the Blood Chemistry of Fishes by : Joseph B. Hunn
Download or read book Bibliography on the Blood Chemistry of Fishes written by Joseph B. Hunn and published by . This book was released on 1967 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A literature search, starting from scratch, is expensive in terms of time spend in comparison with information gathered. This bibliography includes earlier references by Hunn (1959, 1960) that provide some information to anyone seeking a range of "normal" blood values for fish blood chemistry as well as additional literature that attempts to evaluate the physiological responses of fish to changes in their environment.
Book Synopsis Research Report by : U.S. Fish and Wildlife Service
Download or read book Research Report written by U.S. Fish and Wildlife Service and published by . This book was released on 1970 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Accumulated Excretory Products on Hatchery-reared Salmonids by : Roger E. Burrows
Download or read book Effects of Accumulated Excretory Products on Hatchery-reared Salmonids written by Roger E. Burrows and published by . This book was released on 1964 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: In experiments at the Bureau's Salmon-Cultural Laboratory, to determine the excretory products of significance in rearing ponds and the possible effect of these products on fingerling chinook salmon (Oncorhynchus tshawytscha), the results demonstrated that ammonia and urea are the principal products. The relative amounts of these products vary with the concentration of fish and with their metabolic activity. Ammonia assumes dominance in an unfavorable environment. Water temperature, pH, and pond type affect the toxicity of ammonia solutions. Continuous exposure to levels of ammonia normally encountered in rearing ponds produced extensive hyperplasia of the gill epithelium in controlled experiments.
Book Synopsis A Device for Stamina Measurement of Fingerling Salmonids by : Allan E. Thomas
Download or read book A Device for Stamina Measurement of Fingerling Salmonids written by Allan E. Thomas and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A stamina tunnel was developed to measure differences in physical performance of salmonid fingerlings. By subjecting fish samples to controlled patterns of water velocity, it has proved possible to demonstrate differences in fish stamina imparted by disease, nutrition, and environment.
Book Synopsis Description of Eggs and Larvae of the Summer Flounder, Paralichthys Dentatus by : W. G. Smith
Download or read book Description of Eggs and Larvae of the Summer Flounder, Paralichthys Dentatus written by W. G. Smith and published by . This book was released on 1970 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summer flounder eggs and larvae are described from artificially fertilized specimens and from material collected at sea, accompanied by a set of illustrative plates.
Book Synopsis Food Habits of Striped Marlin and Sailfish Off Mexico and Southern California by : Douglas H. Evans
Download or read book Food Habits of Striped Marlin and Sailfish Off Mexico and Southern California written by Douglas H. Evans and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stomach contents of 924 striped marlin landed in the sport catches at Mazatlan, Sinaloa, and Buena Vista, Baja California, Sur, Mexico, and San Diego, California, and of 197 sailfish from Mazatlan and Buena Vista were examined. The striped marlin and sailfish fed primarily on pelagic fishes and cephalopods. By volume the major foods were squid (principally Dosidicus gigas) for striped marlin at Mazatlan and for striped marlin and sailfish at Buena Vista, northern anchovy for striped marlin at San Diego, and threadfin for sailfish at Mazatlan. Locally differences in food habits were pronounced, and some seasonal and yearly differences were found.
Book Synopsis Review of Fishery Studies on Missouri River Main Stem Reservoirs by : Norman Gustaf Benson
Download or read book Review of Fishery Studies on Missouri River Main Stem Reservoirs written by Norman Gustaf Benson and published by . This book was released on 1968 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The six main stem Missouri River reservoirs are described, and information available through 1964 on plankton, water chemistry, fish populations, and water management is discussed. At maximum pool, these reservoirs have a capacity of 76 million acre-feet and a surface area of 1.2 million acres. Each of the upper reservoirs is larger in capacity and area than the sum of the lower three reservoirs. Fishes common in this system are bigmouth buffalo, carp, river carpsucker, yellow perch, goldeye, northern pike, sauger, walleye, white crappie, black crappie, and freshwater drum. Available information on growth rates, year-class strength, and relative abundance of common species is described. Limiting factors of the environments are the turbidities, wind, and fine soils. Research needs and problems relative to fish production are discussed.
Book Synopsis Abstracts of Recent Published Material on Soil and Water Conservation by :
Download or read book Abstracts of Recent Published Material on Soil and Water Conservation written by and published by . This book was released on 1965 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstracts for Dec. 1954- issued in the Agricultural Research Service's series ARS-41.
