Data

NTDPI Tiger and Endeavour Prawn Closure Study, Western Gulf Of Carpentaria 1982-198

Australian Ocean Data Network
CSIRO O&A, Information & Data Centre (Point of contact) CSIRO Oceans & Atmosphere - Hobart (Associated with)
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://marlin.csiro.au/geonetwork/srv/eng/catalog.search#/metadata/39bc3209-289c-4bc2-a3cb-1e050b57bbc8&rft.title=NTDPI Tiger and Endeavour Prawn Closure Study, Western Gulf Of Carpentaria 1982-198&rft.identifier=Anzlic Identifier: ANZCW0306006322&rft.publisher=Australian Ocean Data Network&rft.description=Trawling of commercial prawn species was undertaken in the Western Gulf of Carpentaria, in the Groote Eylandt region. Areas subject to commercial fishing were targeted, with sampling being undertaken at approximately monthly intervals between October 1982 and March 1983. The sampling platform was the 15.8m prawn trawler F.V. Paulwin, towing standard double-twin rig otter trawls. All prawns sampled were identified, sexed, and measured. The total weight for each species, by sex, was measured to ± 5g. Project objectives were: To determine the size composition of the principal tiger prawn species (Penaeus esculentus and Penaeus semisulcatus) and endeavour prawn species (Metapenaeus endeavouri and Metapenaeus ensis) on the commercial fishing grounds subject to seasonal closure in the western Gulf of Carpentaria; to undertake these determinations at monthly intervals between October 1982 and March 1983 inclusive, using a chartered prawn trawler; and to assess and report on the size composition of prawns on fishing grounds within or adjacent to the closed area with reference to the effectiveness of the closures in space and time. Refer to the listed report for further information.Progress Code: completedMaintenance and Update Frequency: notPlannedStatement: One trawl within each 6nm by 6nm grid in the study area was sampled. This was repeated at intervals of approx one lunar month At the end of the fifth cruise some additional trawls were done - some of these were to supplement sample sizes for grids which had yielded only small sample sizes earlier in the cruise. All prawns sampled were identified, sexed, and measured. The total weight for each species, by sex, was measured to +- 5g. When catch of a species or group exceeded the amount required for a sample, the excess was weighed (up to 10kg) or its weight estimated from volume ( > 10kg). CL measured to nearest mm using helios dial calipers. All sample prawns were characterized as 'hard' or 'soft' shelled. Females were examined for presence of maturing or ripe ovaries and externally obvious spermatophore implants. Males were classified as mature or immature when the petasmata were joined or unjoined respectively. Carapace Length (CL) frequencies were converted to weight as count per pound whole. Method of least squares was used to get a CL-individual weight relationship. (Some samples were frozen and later analysed - with the CL recorded to the nearest 0.1mm and weights to the nearest 0.1g). This relationship then gave weight frequency data. This determined weight frequency composition data was then grouped into 4 count-per-pound categories, by species. The CL frequencies of samples of several species of prawns taken from a shot were converted into a size frequency composition of percentage count per pound by major species groups. Catch rates for each shot were determined as kg per hour trawled for each major species group.&rft.creator=Anonymous&rft.date=2004&rft.coverage=westlimit=136; southlimit=-14.5; eastlimit=137; northlimit=-13.5&rft.coverage=westlimit=136; southlimit=-14.5; eastlimit=137; northlimit=-13.5&rft_rights=Not for release by CSIRO.&rft_subject=oceans&rft_subject=Earth Science | Biological Classification | Animals/Invertebrates&rft_subject=Earth Science | Biological Classification | Animals/Invertebrates | Arthropods | Crustaceans | Decapods&rft_subject=Prawn Trawls&rft_subject=Marine Features (Australia) | Groote Eylandt, NT&rft_subject=Data Mining&rft_subject=Prawn Warehouse&rft_subject=Melicertus latisulcatus&rft_subject=Metapenaeus endeavouri&rft_subject=Metapenaeus ensis&rft_subject=Penaeus esculentus&rft_subject=Penaeus semisulcatus&rft_subject=Tiger Prawns & Endeavour Prawns - Metapenaeus endeavouri, Metapenaeus ensis, Penaeus pulchricaudatus, Penaeus esculentus, P. semisulcatus & P. monodon&rft.type=dataset&rft.language=English Access the data
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Trawling of commercial prawn species was undertaken in the Western Gulf of Carpentaria, in the Groote Eylandt region. Areas subject to commercial fishing were targeted, with sampling being undertaken at approximately monthly intervals between October 1982 and March 1983. The sampling platform was the 15.8m prawn trawler F.V. "Paulwin", towing standard double-twin rig otter trawls. All prawns sampled were identified, sexed, and measured. The total weight for each species, by sex, was measured to ± 5g. Project objectives were: To determine the size composition of the principal tiger prawn species (Penaeus esculentus and Penaeus semisulcatus) and endeavour prawn species (Metapenaeus endeavouri and Metapenaeus ensis) on the commercial fishing grounds subject to seasonal closure in the western Gulf of Carpentaria; to undertake these determinations at monthly intervals between October 1982 and March 1983 inclusive, using a chartered prawn trawler; and to assess and report on the size composition of prawns on fishing grounds within or adjacent to the closed area with reference to the effectiveness of the closures in space and time. Refer to the listed report for further information.

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Progress Code: completed
Maintenance and Update Frequency: notPlanned
Statement: One trawl within each 6nm by 6nm grid in the study area was sampled. This was repeated at intervals of approx one lunar month At the end of the fifth cruise some additional trawls were done - some of these were to supplement sample sizes for grids which had yielded only small sample sizes earlier in the cruise. All prawns sampled were identified, sexed, and measured. The total weight for each species, by sex, was measured to +- 5g. When catch of a species or group exceeded the amount required for a sample, the excess was weighed (up to 10kg) or its weight estimated from volume ( > 10kg). CL measured to nearest mm using helios dial calipers. All sample prawns were characterized as 'hard' or 'soft' shelled. Females were examined for presence of maturing or ripe ovaries and externally obvious spermatophore implants. Males were classified as mature or immature when the petasmata were joined or unjoined respectively. Carapace Length (CL) frequencies were converted to weight as count per pound whole. Method of least squares was used to get a CL-individual weight relationship. (Some samples were frozen and later analysed - with the CL recorded to the nearest 0.1mm and weights to the nearest 0.1g). This relationship then gave weight frequency data. This determined weight frequency composition data was then grouped into 4 count-per-pound categories, by species.
  • The CL frequencies of samples of several species of prawns taken from a shot were converted into a size frequency composition of percentage count per pound by major species groups.
  • Catch rates for each shot were determined as kg per hour trawled for each major species group.

    • Notes

    Credit
    DL Grey
    Credit
    RC Buckworth

    Data time period: 1982-10 to 1983-03

    This dataset is part of a larger collection

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    137,-13.5 137,-14.5 136,-14.5 136,-13.5 137,-13.5

    136.5,-14

    text: westlimit=136; southlimit=-14.5; eastlimit=137; northlimit=-13.5

    Subjects
    Data Mining | Earth Science | Biological Classification | Animals/Invertebrates | Earth Science | Biological Classification | Animals/Invertebrates | Arthropods | Crustaceans | Decapods | Marine Features (Australia) | Groote Eylandt, NT | Melicertus latisulcatus | Metapenaeus endeavouri | Metapenaeus ensis | Penaeus esculentus | Penaeus semisulcatus | Prawn Trawls | Prawn Warehouse | Tiger Prawns & Endeavour Prawns - Metapenaeus endeavouri, Metapenaeus ensis, Penaeus pulchricaudatus, Penaeus esculentus, P. semisulcatus & P. monodon | oceans |

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    Identifiers
    • Local : Anzlic Identifier: ANZCW0306006322
    • Local : Marlin Record Number: 6322
    • global : 39bc3209-289c-4bc2-a3cb-1e050b57bbc8