986 resultados para United States. Department of Energy. Office of the Assistant Secretary for Environment.


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Each issue in 2 v., 1879-date: v. 1, Legislative, executive and judicial.--v. 2. Post-office department and postal service.

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At head of title: Department of Commerce. Herbert Hoover, secretary. Bureau of the Census. W.M. Steuart, director.

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"Table No. 6 of the Annual Report on Commerce and Navigation for 1912."

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"Table No. 3 of the Annual Report on Commerce and Navigation for 1912."

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Vol. 1, published in 1883, was issued in a revised edition in 1887.

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Each issue in 2 vols., 1879-1905: v. 1. Legislative, executive and judicial. -- v. 2. Post Office Department and Postal Service.

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At head of title: United States Department of the interior. Harold L. Ickes: secretary. Office of education: J.W. Studebaker, commissioner.

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Comptrollers: 1880-1885, W. Lawrence.--May 1893-Sept. 1894, R. B. Bowler.

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Includes bibliographical references and index.

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This paper summarizes current information on the American shad, Alosa sapidissima, and describes the species and its fishery. Emphasis is placed on (1) life history of the fish, (2) condition of the fishery by State and water areas in 1960 compared to 1896 when the last comprehensive description was made, (3) factors responsible for decline in abundance, and (4) management measures. The shad fishery has changed little over the past three-quarters of a century, except in magnitude of yield. Types of shad-fishing gear have remained relatively unchanged, but many improvements have been made in fishing techniques, mostly to achieve economy. In 1896 the estimated catch was more than 50 million pounds. New Jersey ranked first in production with about 14 million pounds, and Virginia second with 11 million pounds. In 1960 the estimated catch was slightly more than 8 million pounds. Maryland ranked first in production with slightly more than 1.5 million pounds, Virginia second with slightly less than 1.4 million pounds, and North Carolina third with about 1.3 million pounds. Biological and economic factors blamed for the decline in shad abundance, such as physical changes in the environment, construction of dams, pollution, over-fishing, and natural cycles of abundance, are discussed. Also discussed are methods used for the rehabilitation and management of the fishery, such as artificial propagation, installation of fish-passage facilities at impoundments, and fishing regulations. With our present knowledge, we can manage individual shad populations; but, we probably cannot restore the shad to its former peak of abundance.

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Mode of access: Internet.

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Mode of access: Internet.