Browsing by Author "Hofstetter, R. P."
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Item Management of the Mudshell Industry - Oyster Reef Development and Protection(Texas Game and Fish Commission, 1960-08-01) Hofstetter, R. P.Objectives: To regulate the mudshell industry for the protection of existing live oyster reefs. To explore means and methods for permitting maximum shell production with minimum damage to the oyster resources.Item Monitoring of coastal shellfish resources, January - December 1984(Texas Parks and Wildlife Department, Coastal Fisheries Branch, 1986) Benefield, R. L.; Hammerschmidt, P. C.; Hofstetter, R. P.; Bowling, B.;Trends in relative abundance and size of brown shrimp (Penaeus aztecus), white shrimp (P. setiferus), pink shrimp (P. duorarum), blue crab (Callinectes sapidus) and American oyster (Crassostrea virginica) in Texas bay systems and the Gulf of Mexico (shrimp and crabs only) were monitored during January-December 1984. Bag seines (18.3-m, 60-feet, long) were used to sample along shorelines of bays, 6.1-m (20-feet) wide otter trawls were used to sample the deeper (>1.0-m, 3-feet) portion of bays, passes leading from the bays to the gulf of Mexico and Gulf waters. Gill nets (183-m, 600-feet, long) were used to sample shorelines of bays, and oyster dredges (46-cm, 18-inches, wide) were used to sample oyster reefs within the bay. Shorelines and deeper portions of Galveston, Matagorda, San Antonio, Aransas and Corpus Christi Bays and the upper and lower Laguna Madre were sampled. Passes were sampled in Galveston, Matagorda, Aransas and Corpus Christi Bays and the lower Laguna Madre and Gulf samples were collected along the central coast off Port Aransas. Oyster samples were collected primarily in Galveston Bay with seasonal samples taken in Matagorda, San Antonio and Aransas Bays. Coastwide bag seine catch rates of brown shrimp increased from 1983 to 1984, whereas trawl catch rates were similar during both years. Coastwide bag seine catch rates of white shrimp increased from 1983 to 1984, while trawl catch rates decreased. Coastwide bag seine catch rates of pink shrimp declined from 1983 to 1984, whereas trawl catch rates were similar during both years. Coastwide mean lengths of brown shrimp and white shrimp caught in trawls increased from 1983 to 1984. Coastwide bag seine catch rates of blue crabs declined and trawl catch rates decreased slightly from 1982 to 1984.Item Oyster Investigation Quarterly Report, January, 1953 - April, 1953(Texas Game and Fish Commission, 1953) Hofstetter, R. P.The purpose of this investigation is to develop a management program for the oyster resources in Galveston Bay. Most of the time has been devoted to a survey of the major oyster reefs to determine their condition and extent. Information on the spawning and setting of the oyster has been gathered although no intensive work has, as yet, been done. The distribution of the parasite, Dermocystidium marinum, has been studied with the aid of Mr. Sammy Ray of Rice Institute.Item Proceedings of the National Shellfisheries Association(Economy Printing Co., 1971) National Shellfisheries Association; Shaw, William N.; Hofstetter, R. P.This report contains abstracts of technical papers presented at the 1970 NSA ConventionItem Sources and Effects of Silt Upon Oysters - Oyster Reef Development and Protection(Texas Game and Fish Commission, 1960-08-01) Hofstetter, R. P.Objectives: To locate sources of siltation and to examine the effects of silt flow upon oyster reefs.Item Study of Oyster Growth and Population Structure of the Public Reefs in East Bay, Galveston Bay and Trinity Bay - Survey of Oyster Populations and Associated Organisms(Texas Game and Fish Commission Marine Laboratory, 1963) Hofstetter, R. P.; Texas Game and Fish Commission Marine Fisheries Project Reports 1961-1962A moderate set of spat was observed throughout the bay in June and July. A light spat set also occurred in September and October on reefs in the middle and lower bay areas. The fall set was not found in upper Trinty Bay. The majority of the oysters were less than three years of age although remnant population of oysters over five years old were occasionally found. Some oysters reached legal size at two and one-half years of age but most of the market sized oysters were over three years old. The incidence of the fungus organism, Dermocystidium marinum, increased in late summer and early fall. As a result, mortalities among the older oysters were expected to increase. However, no unusual mortalities were noted by the end of the sample period. The 1961-62 oyster harvest was generally confined to Todd's Dump and Hanna's Reef. Oysters were good in quality but not exceptional. During the 1962-63 season oyster boats speard out and worked several reefs which had been unproductive in past years. Both the quality and quantity of oysters were better than in previous years.Item Survey of Experimental Oyster Plots - Oyster Reef Development and Protection(Texas Game and Fish Commission, 1960-08-01) Hofstetter, R. P.Objectives: (1) To determine the value of mudshell as material for oyster reef construction; (2) To study growth and survival of oysters on mudshell pads.Item Survey of Oyster Reefs and Oyster Bottoms - Oyster Reef Development and Protection(Texas Game and Fish Commission, 1960-08-01) Hofstetter, R. P.Objectives: To locate and map existing oyster reefs and other bottom types suitable for oyster cultivation.Item Survey of the Abundance and Condition of Market Oysters - Oyster Investigations, Galveston Bay(Texas Game and Fish Commission, 1960-08-01) Hofstetter, R. P.Objectives: To determine the abundance of oysters available for the commercial harvest and to determine the condition of the oysters during the harvest season.