GBIC Materials Available at Jack K. Williams Library
Permanent URI for this collectionhttps://hdl.handle.net/1969.3/28657
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Browsing GBIC Materials Available at Jack K. Williams Library by Author "A symposium on estuarine fisheries. Presented at the 94th annual meeting, Atlantic City, New Jersey, September 1964."
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Item The estuary as a habitat for spotted seatrout, Cynoscion nebulosus.(Allen Press, Incorporated, 1966) Tabb, D.C.; Smith, R.F., A.H. Swartz, and W.H. Massmann; A symposium on estuarine fisheries. Presented at the 94th annual meeting, Atlantic City, New Jersey, September 1964.The spotted seatrout is one of the most valuable fish of the southeastern United States. It is one of the few species that depends on the changeable habitats of estuaries and lagoons, even spawning there. Both young and adults are tolerant of the normal environmental extremes of estuaries, which are too rigorous for most marine fishes. This enables the spotted seatrout to reproduce, and grow almost unhindered by predation and competition. Spotted seatrout populations of more northern estuaries apparently make seaward movements to escape winter cold but southern populations do not exhibit a strong offshore movement. They are nearly nonmigratory in Florida; tagging studies show that they seldom move more than 30 miles from the point of tagging. Since most of the favored estuarine areas are separated by long stretches of exposed seashore there is little exchange of stocks between estuary systems. The nonmigratory character of the species, when combined with differences in habitat, has resulted in spotted seatrout populations having different growth rates. Unfavorable conditions for feeding or spawning in any given estuary, which cause declines in abundance, are likely to be felt for long periods since the region will not likely receive large numbers of immigrants from other estuaries.Item The relation of menhaden to estuaries.(Allen Press, Incorporated, 1966) Reintjes, J.W.; Pacheco, A.L.; Smith, R.F., A.H. Swartz, and W.H. Massmann; A symposium on estuarine fisheries. Presented at the 94th annual meeting, Atlantic City, New Jersey, September 1964.Menhaden, genus Brevoortia, use estuaries along the Atlantic and Gulf coasts of the United States as nursery areas for more than half of their first year of life. The Atlantic menhaden, B. tyrannus, and Gulf menhaden, B. patronus, support the largest fishery in North America and observations reported concern mainly these species. Spawning occurs in the Atlantic Ocean and Gulf of Mexico. After hatching and early development the larvae move into estuaries. The time spent in the ocean before entering the estuaries is not known. Larvae move into the tributraries near the upstream limits of saline water. Water temperatures below 3 C deter entry into the estuaries, inhibit movements into the tributaries, and cause mass mortalities. Temperatures below 3 C killed larvae confined in the laboratory at salinities of 24 o/oo but effects varied somewhat whith acclimation temperatures. Larvae and juvenile menhaden were collected in salinities of 1 o/oo or less along the Atlantic and Gulf coasts of the United States. Along the south Texas coast juveniles survived salinities up to 60 o/oo but were killed by 80 o/oo. Other physical, chemical, and biological factors affecting young menhaden are mentioned but supporting data are few. Literature citations include most of the publications on the estuarine phase of the menhaden's life history.Item The role of estuaries in the development and perpetuation of commercial shrimp resources.(Allen Press, Incorporated, 1966) Kutkuhn, J.H.; Smith, R.F., A.H. Swartz, and W. H. Massmann; A symposium on estuarine fisheries. Presented at the 94th annual meeting, Atlantic City, New Jersey, September 1964.This report summarizes knowledge concerning functional relationships between the estuarine environment and commercial shrimp resources. Discussion is largely restricted to North American species; attention is focused upon situations evolving specifically as a result of the rapid urban and industrial development of our estuary-rich Gulf coast. The association of shrimp and the brackish-water environment from ontogenetic and ecological points of view is reviewed. The question of continued productivity and perpetuation of shrimp stocks in the face of man's steady incursion of estuaries is considered. Also considered are measures that might be taken to counteract real, or imagined, effects of society's development of coastal wetlands.Item The Texas Basins project.(Allen Press, Incorporated, 1966) Chapman, C.R.; Smith, R.F., A.H. Swartz, and W.H. Massmann; A symposium on estuarine fisheries. Presented at the 94th annual meeting, Atlantic City, New Jersey, September 1964.The Texas Basins project is part of a plan to develop water resources of Texas to meet projected municipal,industrial, and insofar as possible, irrigation requirements in the year 2010. Eighteen reservoirs would supply water to a trans-Texas canal which would intercept tributary discharge to all coastal marshes. The large anticipated demands not related directly to the project, combined with project diversions, would reduce by one-half the average annual freshwater flow of 26 1/2 million acre-feet now reaching Texas estuaries. The reduction could exceed 75 % during dry years. The Texas Basins project would account for about on-third of this reduction. About 1 1/3 million acres of tidewater in Texas yield about 200 million pounds of fish and shellfish annually to commercial fishermen, and support more than 7 million man-days of sport fishing. Losses could be prevented and certain benefits realized by enlarging the scope of the Texas Basins project to provide for maintenance of estuarine fishery resources, and to prevent the discharge of toxic pesticides.