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Computation, Analysis and Preparation of Coastwide Oyster Population Data - Survey of Oyster Population and Associated Organisms (2021)

Heffernan, T. L.

Texas Game and Fish Commission Marine Laboratory | Rockport, TX

In: http://aquaticcommons.org/id/eprint/14201 | 9596 | 2020-08-31 20:32:13 | 14201 | Galveston Bay Information Collection

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Publikationsdatum: 2021-06-24

Beschreibung: Galveston Bay, Matagorda Bay, San Antonio Bay, Aransas Bay and South Bay areas were sampled at a total of nineteen stations to determine the population characteristics and fluctuations of oysters on the Texas coast. Population samples taken at monthly intervals from these stations showed heavy spat setting occurred in June 1962 and continued in moderation through December 1962. Survival of spat and seed class oysters ranged from moderate in Galveston Bay to excellent in the lower coastal bays. No extensive natural moralities were noted in any of the bay areas and the number of market-sized oysters increased in nearly all the bays. Dermocystidium marinum incidence maintained a high level, but no moralities were associated with the fungus. Oyster populations in Aransas Bay have recovered from the 1959 die-off and are once again approaching an overcrowded conditions for lack of harvesting. Artificial reefs, built in Aransas and Matagorda Bays, have been extremely successful and have attained the characteristics of natural oyster reefs.

Schlagwort(e): Biology ; Fisheries ; oysters ; marine molluscs ; population dynamics ; oyster reefs ; artificial reefs ; growth ; mortality

Repository-Name: AquaDocs

Materialart: book_section

Format: application/pdf

Format: 10

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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 (2021)

Hofstetter, R.P.

Texas Game and Fish Commission Marine Laboratory | Rockport, TX

In: http://aquaticcommons.org/id/eprint/14202 | 9596 | 2020-08-31 20:32:23 | 14202 | Galveston Bay Information Collection

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Publikationsdatum: 2021-06-24

Beschreibung: A 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 Trinity 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, moralities among the older oysters were expected to increase. However, no unusual moralities 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 spread 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.

Schlagwort(e): Biology ; Fisheries ; oysters ; marine molluscs ; life history ; growth ; population dynamics ; oyster fisheries

Repository-Name: AquaDocs

Materialart: book_section

Format: application/pdf

Format: 23

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Population Studies of the Blue Crabs of the Galveston Bay System - Studies of Blue Crab Populations of the Texas Coast (2021)

Pullen, E.J.

Texas Game and Fish Commission Marine Laboratory | Rockport, TX

In: http://aquaticcommons.org/id/eprint/14204 | 9596 | 2020-08-31 20:32:49 | 14204 | Galveston Bay Information Collection

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Publikationsdatum: 2021-06-24

Beschreibung: Trawls, seines, and trammel nets were used to sample the Galveston Bay crab populations. The data collected were used in determining the seasonal abundance of the crabs as compared to previous years' sampling. Blue crab populations in 1962 appeared to be larger than in 1961. The female population lagged behind the male in abundance in all months in 1962 except April, October, and December. The movement of adult crabs appeared to be governed by their search for food, reproductive cycle, and seasonal temperatures. Juveniles remained in the bay all seasons, moving toward the primary bay as they grew. Growth rate of the juvenile crabs was 0.4mm per day.

Schlagwort(e): Fisheries ; Oceanography ; blue crab ; marine crustaceans ; population dynamics ; abundance ; growth ; life history

Repository-Name: AquaDocs

Materialart: book_section

Format: application/pdf

Format: 11

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