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  • 1
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    Results of Jack Mackerel tagging study, 1971-75 (2021)
    California Department of Fish and Game, Marine Resources Region | Menlo Park, CA
    In:  http://aquaticcommons.org/id/eprint/234 | 8 | 2011-09-29 22:22:22 | 234 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-27
    Description: Methods and materials used to tag and recapture jack mackerel, Trachurus symmetricus, off the coast of southern Ca1ifornia and Baja California, Mexico, are described. Tagging, recapture, and movement data resulting from this program are reported. Analysis of these data indicates substantial movement of jack mackerel within the range of the California fishery and suggests a seasonal inshore-offshore movement pattern. (13pp.)
    Keywords: Management ; Fisheries ; Biology ; Jack mackerel ; Trachurus symmetricus ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    Cruise Report 71-KB-19: Jack mackerel tagging program (2021)
    California Department of Fish and Game, Marine Resources Region | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/575 | 8 | 2011-09-29 21:54:26 | 575 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-30
    Description: (1p.)
    Keywords: Fisheries ; Biology ; R/V Kelp Bass ; Southern California ; jack mackerel ; Trachurus symmetricus ; Pacific mackerel ; Scomber japonicus ; cruise report
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    Dungeness crab research program (2021)
    California Department of Fish and Game, Marine Resources Region | Menlo Park, CA
    In:  http://aquaticcommons.org/id/eprint/63 | 8 | 2011-09-29 13:04:21 | 63 | California Department of Fish and Game
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    Publication Date: 2021-06-25
    Description: In 1974, the California State Legislature, recognizing theproblem of low yields from the Dungeness crab resource ofcentral California, directed the Department of Fish and Gameto conduct an investigation into the causes of the decline.The Operations Research Branch of the Department has conductedpreliminary studies and field operations necessary to formulate the Dungeness Crab Research Program. The objectives,research design, and work plans are presented for a 4-yearprogram from July 1, 1975 through August 31, 1979. (38pp.)
    Keywords: Management ; Fisheries ; Biology ; Dungeness crab ; Cancer magister ; commercial fishery
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    Results of the jack mackerel subpopulation discrimination feasibility study (2021)
    California Department of Fish and Game, Marine Resources Region | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/84 | 8 | 2011-09-29 22:37:18 | 84 | California Department of Fish and Game
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    Publication Date: 2021-06-25
    Description: A report is made on the feasibility of discriminating subpopulations of jack mackerel, Trachurus symmetricus, off of the southern California and Baja California coast. Histochemical, morphometric, and meristic characters are compared from four samples of approximately 200 fish each taken from three areas. The data are analyzed for homogeneity by chi-square tests. Heterogeneity was found only in anal fin ray counts. Recommendations for a comprehensive study are made. (16pp.)
    Keywords: Fisheries ; Biology ; Jack mackerel ; Trachurus symmetricus
    Repository Name: AquaDocs
    Type: monograph
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  • 5
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    Dungeness crab research program: Report for the year 1975 (2021)
    California Department of Fish and Game, Marine Resources Region | Eureka, CA
    In:  http://aquaticcommons.org/id/eprint/89 | 8 | 2011-09-29 22:36:15 | 89 | California Department of Fish and Game
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    Publication Date: 2021-06-25
    Description: The progress of the research program in the year 1975 is presented. In addition to a report of project studies, discussions of program development, research procedures, and cooperative research efforts are included. The crab critical stage project studies included distribution and relative abundance of larvae and juvenile crabs in the Gulf of the Farallones, San Pablo Bay and San Francisco Bay. Several fish species were identified as crab predators, genetic structure of Dungeness crab populationswere investigated, and growth rates of juvenile crabs were determined. The crab environment project collected historical and recent data on parameters of oceanographic factors including temperatures, salinities, currents, upwelling, sea level, and river flows into the bays and ocean. Environmental toxicant levels in crabs are being determined for a wide spectrum of heavy metals, pesticides, PCB's, and petroleum hydrocarbons.The Marine Culture Laboratory developed techniques for small and large scale culture of crabs from eggs held under controlled conditions to aid in design of laboratory tests of the effects of environmental factors on crab survival. (81pp.)
    Keywords: Fisheries ; Biology ; Gulf of the Farallones ; San Pablo Bay ; San Francisco Bay ; California ; Dungeness crabs ; Cancer magister ; commercial fishery
    Repository Name: AquaDocs
    Type: monograph
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  • 6
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    A status report on the Jack Mackerel tagging program (2021)
    California Department of Fish and Game, Marine Resources Region | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/133 | 8 | 2011-09-29 22:31:34 | 133 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: Methods and materials used to tag and recapture jack mackerel, Trachurus symmetricus, off the coast of southern California and Baja California, Mexico, are described. Tagging, recapture, and movement data resulting from this program are reported. Analysis of this preliminary data indicates a seasonal inshore-offshore movement pattern for this species within the range of the California fishery. (9pp.)
    Keywords: Management ; Fisheries ; Jack mackerel ; Trachurus symmetricus ; California ; tagging
    Repository Name: AquaDocs
    Type: monograph
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  • 7
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    Dungeness crab research program: Report for the Year 1976 (2021)
    California Department of Fish and Game, Marine Resources Region | Menlo Park, CA
    In:  http://aquaticcommons.org/id/eprint/186 | 8 | 2011-09-29 22:23:36 | 186 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-27
    Description: All larval stages of the 1976 year class, with the exception of the 5th zoeal stage, were found in Gu1f waters January through March. The first post-larval stage was collected in San Pablo Bay in May. Fifty percent of 1976 year class crabs entered the Bay complex as compared to nearly 80% in 1975. The 1976 year class appears relatively weak. No electrophoretic polymorphism was found in Cancer magister to be of value in Dungeness crab population determinations.Multi-variate correlations comparing crab landings with an array of oceanographic parameters and the crab density dependent factor were computer-run for both northern and central California. The most significant correlating factors at the time late stage larvae prevail were sea level and atmospheric pressure for central California and, for northern California, the density dependent factor and sea surface temperature. Female crabs held at controlled temperatures indicated gonad maturation and spawningmay be induced by increased temperature. Analyses of crabtissues revealed burdens of petroleum hydrocarbons, silver,selenium, cadmium, and PCB's higher in central California crabs, while DDE was found in higher amounts in northern California crab tissue.Thru-flow culture systems were developed which should yield about 163 megalopae of Dungeness crabs in 63 days from 1,200 laboratory hatched zoeae.(46pp.)
    Keywords: Fisheries ; Biology ; Dungeness crab ; California ; Cancer magister ; fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 8
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    Cruise Report 72-KB-13: Jack Mackerel tagging program (2021)
    California Department of Fish and Game, Marine Resources Region | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/589 | 8 | 2011-09-29 21:48:13 | 589 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-01
    Description: (1p.)
    Keywords: Ecology ; Biology ; R/V Kelp Bass ; California ; Jack mackerel ; Pacific mackerel ; Scomber japonicus ; Trachurus symmetricus
    Repository Name: AquaDocs
    Type: monograph
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  • 9
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    A checklist of zooplankters from the Gulf of the Farallones and off Northern California (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/716 | 8 | 2011-09-29 21:41:36 | 716 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Plankton samples were collected from January through June 1975-80 as part of the Dungeness Crab Research Program. Zooplankters were identified and enumerated from 1975-77 and 1979 samples taken in the Gulf of the Farallones and from 1979 samples off northern California. A checklist of zooplankters found in these samples is presented along with information on location, frequency of occurrence, and density. (57pp.)
    Keywords: Biology ; zooplankton ; Gulf of the Farallones ; Northern California ; Dungeness Crab
    Repository Name: AquaDocs
    Type: monograph
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