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  • 1
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    Oyster Studies Along the Texas Coast, 1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14240 | 9596 | 2020-08-31 20:19:08 | 14240 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Oyster (Crassostrea virginica) studies showed death rates to be low in Aransas and Galveston Bays but relatively high in Matagorda Bay. Initial mortality in Matagorda Bay was associated with freshwater and siltation but subsequent summer deaths were associated with Labyrinthomyxa infection.
    Keywords: Ecology ; oysters ; Crassostrea virginica ; mortality ; oyster fisheries ; Labyrinthomyxa sp. ; fungal diseases ; stock assessment ; GBIC
    Repository Name: AquaDocs
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  • 2
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    Levels of Concentration and Incidence of Various Pesticide Toxicants in Some Species from Selected Bay Areas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14239 | 9596 | 2020-08-23 21:29:40 | 14239 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Tissue samples analyzed indicate that residues of some pesticides are present in all Texas bay areas sampled, including Galveston Bay. The residues detected are DDT, Dieldrin and Endrin. The incident of DDT residues decreased slightly in both oyster, Crassostrea virginica, and fish samples during the study period. The incidence of Dieldrin increased dramatically in oyster samples while decreasing in fish samples. The incidence of Endrin remained essentially unchanged. Ovaries of speckled trout, Cynoscion nebulosus, contained enough DDT residue to cause concern over the possible impairment of reproductive ability.
    Keywords: Ecology ; pesticides ; dichlorodiphenyltrichloroethane (DDT) ; dieldrin ; endrin ; oysters ; Crassostrea virginica ; speckled trout ; Cynoscion nebulosus ; GBIC
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  • 3
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    Ecological Attribute Alteration: Measurement and Evaluation: Activity Assessment Routine: Ecological Systems Component (2021)
    RPC, Inc. | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14166 | 9596 | 2020-08-31 20:24:34 | 14166 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: This technical paper is intended to provide a more complete treatment of implicit principles and assumptions contained in the user's manual for the ecological systems component of the activity assessment routine. The ecological systems component (ESC) defines a method for evaluating changes in an ecosystem which may result from resource use and consumption. This paper begins by characterizing an ecosystem as an organized collection of attributes mutually dependent on energy exchange. The magnitude matrix with which altered energy flows are scaled is described in Chapter 4. The magnitude of an alteration is assessed somewhat differently for the two categories of attributes: discussion of conventions relevant to this distinction is provided in Chapter 5. However, effects on attributes are variable through time, and additional remarks concerning duration are included in Chapter 6. Finally, possible exceptions to the general guidelines for designating the direction of an effect are introduced in Chapter 7.
    Keywords: Ecology ; Management ; coastal zone management ; ecological assessment ; evaluation
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    Format: 60
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  • 4
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    Study of the Texas Bay Populations of Juvenile Shrimp, Penaeus aztecus, Penaeus setiferus, and Penaeus duorarum (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14185 | 9596 | 2020-08-31 20:28:08 | 14185 | Galveston Bay Information Collection
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    Publication Date: 2021-06-24
    Description: Postlarvae were found entering Aransas Bay in appreciable numbers in the spring of 1963. Late post-larval and early juvenile stages of brown shrimp, Penaeus aztecus, were found in tertiary bays in April. White shrimp, P. setiferus were found in May and June. Brown shrimp grew about 0.8 mm per day, while white shrimp grew about 1.1 mm per day. The first wave appeared to be smaller than latter waves. Small brown shrimp were found moving through the inshore Gulf in large numbers in June and July. White shrimp reached a larger size in the bays in June and July. White shrimp reached a larger size in the bays and supported a large commercial bay fishery. Late fall waves of white shrimp left the bays at a smaller size (probably to escape low water temperatures). Preliminary data indicate the 1963 shrimp landings increased 25% over 1962 landings.
    Keywords: Ecology ; penaeid shrimp ; juveniles ; landing statistics ; white shrimp ; Penaeus setiferus ; brown shrimp ; Penaeus aztecus ; Penaeus duorarum ; growth
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    Format: 49
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  • 5
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    A study of commercial shrimp populations in coastal bays of Texas,1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14243 | 9596 | 2020-08-23 21:20:15 | 14243 | Galveston Bay Information Collection
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    Publication Date: 2021-06-24
    Description: In spring, the growth of brown shrimp, Penaeus aztecus, in Texas bays, including Galveston Bay, was delayed by cold water. Low salinity patterns of upper coastal bays confined the young to more saline lower regions of estuaries. The gulfward migration began in late May. By July most had left the bays. Heavy rainfall and runoff may have been beneficial to white shrimp, Penaeus setiferus. They were abundant in samples and over 12 million pounds were landed commercially.
    Keywords: Ecology ; penaeid shrimp ; temperature effects ; Penaeus aztecus ; salinity effects ; Penaeus setiferus ; growth ; estuaries ; population dynamics ; GBIC
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  • 6
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    Effects of Engineering Projects on the Ecology of Jones Bay - Effects of Engineering Projects on Galveston Bay Estuaries - Evaluation of the Effects of Estuarine Engineering Projects (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14262 | 9596 | 2020-08-23 20:01:31 | 14262 | Galveston Bay Information Collection
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    Publication Date: 2021-06-24
    Description: In 1962 construction was begun on the Texas City and Vicinity Hurricane- Flood Protection Project, a program of the U.S. Corps of Engineers, which provided for a 16.2 mile long earthen seawall along the western shoreline of Galveston Bay. This levee, with a maximum height of 23 feet above sea level, was designed to protect low areas from tidal flooding during storms. In 1964, the Hitchcock Extension of the Hurricane-Flood Protection was proposed, a plan consisting of an 11.4 mile levee to protect the city of Hitchcock and vicinity. A portion of this levee crosses Jones Bay. Circulation in the bay would be provided by a closable tidal structure and culvert openings.
    Keywords: Ecology ; Engineering ; Environment ; flood control ; sea walls ; levees ; environmental effects ; ecology ; GBIC
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  • 7
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    Study of Sand Seatrout of the Galveston Bay Area (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14274 | 9596 | 2020-10-17 16:17:25 | 14274 | Galveston Bay Information Collection
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    Publication Date: 2021-06-24
    Description: Sand seatrout (Cynoscion arenarius Ginsberg) were studied in the Galveston Bay area to provide information on seasonality, population composition, food items, growth, and spawning. Tagging efforts resulted in 518 tagged fish and a return of 16 tags during the 1968-70 period. Tag recovery data suggest a migration from the upper bay to the lower bay and Gulf waters in December and return in March. Electrophoretic analysis of multiple hemoglobin protein types were studied from 96 sand seatrout blood samples. Five protein types were observed without discernible differences that could be attributed to population heterogeneity. Analysis of stomach content revealed crustacea and fish as primary food items. Gonad development stages indicate a spawning period from March through August.
    Keywords: Ecology ; marine fish ; sand seatrout ; Cynoscion arenarius ; growth ; seasonality ; community composition ; food preferences ; spawning ; tagging ; stomach content ; migrations ; electrophoresis ; GBIC
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  • 8
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    Galveston Bay Oyster Studies, 1971 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14264 | 9596 | 2020-08-23 20:48:55 | 14264 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Galveston Bay oyster stocks were studied to detect changes which might affect the public reef oyster harvest. A mild winter and above normal salinity values favored increased disease (Labyrinthomyxa) incidence as well as increased predation from oyster drills (Thais) and stone crabs (Menippe). These factors resulted in annual death rates of 52% to 55% among older oysters groups. Oyster spat in an epidemic area were Labyrinthomyxa-infected by fall and suffered above normal mortality.
    Keywords: Ecology ; Fisheries ; oysters ; stock assessment ; oyster reefs ; oyster fisheries ; predation ; fungal diseases ; oyster drills ; stone crab ; seed ; spat ; larval settlement ; mortality ; survival ; GBIC
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  • 9
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    Analysis of Populations of Sports and Commercial Fin-fish in the Coastal Bays of Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14242 | 9596 | 2020-08-31 20:19:45 | 14242 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Juvenile game fish were sampled in 1968 in all Texas bay areas with 60 ft. bag seines; adult fish were sampled in Galveston Bay by drag seine and in Aransas Bay and the Upper and Lower Laguna Madre with trammel nets. A general and significant increase in the relative abundance of juvenile redfish, Sciaenops ocellata, was noted. In the case of trout, Cynoscion nebulosus, flounder, Paralichthys lethostigma, black drum, Pogonias cromis, and sheepshead, Archosargus probatocephalus, there was either a decline in general abundance or no significant change from the previous year. While variations in abundance of adult fish occurred within bays, no coastwide patterns could be discerned. These samples were obtained in order to determine relative abundance, seasonal fluctuations in abundance and success of spawning. Captured fish of sufficient size and in good condition were tagged and released to study movements, migrations and rate of fishing harvest.
    Keywords: Ecology ; Fisheries ; marine fish ; game fish ; finfish fisheries ; juveniles ; commercial species ; population dynamics ; seine nets ; entangling nets ; abundance ; seasonal variations ; spawning ; GBIC
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  • 10
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    Survey of Fish Populations in the Inshore Gulf of Mexico off Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14247 | 9596 | 2020-08-28 15:46:37 | 14247 | Galveston Bay Information Collection
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    Publication Date: 2021-06-24
    Description: Fish populations in the inshore Gulf of Mexico off Port Aransas, Texas, Port Mansfield and Port Isabel, Texas and briefly off Galveston, Texas, were surveyed for type, abundance and size with a flat otter trawl. In regular weekly samples, 25,044 fish of 89 species were caught in 100 otter trawl samples. Atlantic croaker, Micropogon undulatus; sand trout, Cynoscion nothus; moonfish, Vomer setapinnis; bumper, Chloroscombrus chrysurus; and shoal flounder Syacium gunteri, were the five most abundant species taken in depths ranging from 3 to 16 fathoms. These results indicate that enough trash fish may be caught during routine shrimp trawling to sustain a profitable fishery if a market develops. No attempt was made to evaluate the abundance of larger food or game fishes.
    Keywords: Ecology ; Fisheries ; marine fish ; trawl nets ; population dynamics ; GBIC
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