996 resultados para United States. Dept. of the Interior. Library


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Mode of access: Internet.

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Title varies slightly.

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The present general list supersedes three previous general lists of periodicals received by the library: (1) Catalog of the periodicals and other serial publications in the library, issued in 1901 as Library bulletin 37; [2] List of periodicals currently received in the library, issued in 1909 as Library bulletin 75; and (3) List of serials currently received in the library of the United States Department of agriculture, issued in January 1922 as Department circular 187. cf. Introd., p. iii-iv.

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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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Relates to rate discrimination by the Union Pacific Railroad.

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At head of title: United States Dept. of Commerce. Jesse H. Jones, secretary. Bureau of the Census. J. C. Capt, director.

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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.