Data

Biology and population dynamics of redbait and jack mackerel

Name: Biology and population dynamics of redbait and jack mackerel
Published: 2008

University of Tasmania, Australia

Lyle, Jeremy, Dr

Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]

ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/ad319b70-6e63-11dd-9d1e-00188b4c0af8&rft.title=Biology and population dynamics of redbait and jack mackerel&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/ad319b70-6e63-11dd-9d1e-00188b4c0af8&rft.description=Sampling of commercial mid-water trawl catches for small pelagics from waters adjacent to Tasmania have yielded an extensive biological dataset in space and time. As a minimum, size composition information is available from most commerical shots undertaken between 2002 and 2006, referenced with operational information (location, depth and catch weight). Subsamples of the key small pelagics, redbait, jack mackerel and blue mackerel, were examined for size, sex, gonad weight and stage and otoliths have been retained for age determination.Further data has been collected since the initial investigation.Maintenance and Update Frequency: notPlannedStatement: Redbait and jack mackerel were sub-sampled from commercial mid-water trawl catches taken on the coastal shelf break off Tasmania, generally in depths of 100–180 m. Fish were collected from both the spawning season and outside of the spawning season. Random samples of at least 100 fish per shot were collected opportunistically from commercial fishing operations between 2003 and 2006. Fish were frozen onboard, later thawed and fork length, total weight, sex, and gonad stage and weight were determined. During the spawing season, in addition to the frozen samples, random samples of at least 30 mature redbait females (≥stage III) from selected trawl shots were retained and either preserved whole (2006) or measured fresh and ovaries preserved (2004 and 2005) in FAACC (10% formalin, 5% glacial acetic acid and 1.3% calcium chloride). Fish that were preserved whole were slit from vent to ventral cradle to assist gonad preservation. Representatives of the immature gonad stages and additional selected females with hydrated oocytes were also preserved in FAACC, the latter to supplement those used for fecundity estimation. These fish were identified separately from those individuals that were sampled randomly. Further methodology specific to work on redbait, can be found in the published paper.&rft.creator=Lyle, Jeremy, Dr &rft.date=2008&rft.coverage=westlimit=147.1; southlimit=-43.6; eastlimit=147.5; northlimit=-43.0&rft.coverage=westlimit=147.1; southlimit=-43.6; eastlimit=147.5; northlimit=-43.0&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au/&rft_rights=The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_rights=See point of contact for access to the data.&rft_rights=The data described in this record are the intellectual property of the University of Tasmania through the Tasmanian Aquaculture and Fisheries Institute.&rft_subject=biota&rft_subject=FISHERIES&rft_subject=EARTH SCIENCE&rft_subject=AGRICULTURE&rft_subject=AGRICULTURAL AQUATIC SCIENCES&rft_subject=FISH&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/VERTEBRATES&rft_subject=37 345001&rft_subject=Emmelichthys nitidus&rft_subject=37 337002&rft_subject=Trachurus declivis&rft_subject=37 441001&rft_subject=Scomber australasicus&rft_subject=Aquatic Ecosystem Studies and Stock Assessment&rft_subject=AGRICULTURAL AND VETERINARY SCIENCES&rft_subject=FISHERIES SCIENCES&rft_subject=Fisheries Sciences not elsewhere classified&rft_subject=Marine and Estuarine Ecology (incl. Marine Ichthyology)&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ECOLOGY&rft_subject=Size&rft_subject=Sex&rft_subject=Gonad weight&rft_subject=Gonad stage&rft_subject=Age&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 2.5 Australia License
http://creativecommons.org/licenses/by/2.5/au/

The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).

See point of contact for access to the data.

The data described in this record are the intellectual property of the University of Tasmania through the Tasmanian Aquaculture and Fisheries Institute.

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Full description

Sampling of commercial mid-water trawl catches for small pelagics from waters adjacent to Tasmania have yielded an extensive biological dataset in space and time. As a minimum, size composition information is available from most commerical shots undertaken between 2002 and 2006, referenced with operational information (location, depth and catch weight). Subsamples of the key small pelagics, redbait, jack mackerel and blue mackerel, were examined for size, sex, gonad weight and stage and otoliths have been retained for age determination.
Further data has been collected since the initial investigation.

Lineage

Maintenance and Update Frequency: notPlanned

Statement: Redbait and jack mackerel were sub-sampled from commercial mid-water trawl catches taken on the coastal shelf break off Tasmania, generally in depths of 100–180 m. Fish were collected from both the spawning season and outside of the spawning season. Random samples of at least 100 fish per shot were collected opportunistically from commercial fishing operations between 2003 and 2006. Fish were frozen onboard, later thawed and fork length, total weight, sex, and gonad stage and weight were determined. During the spawing season, in addition to the frozen samples, random samples of at least 30 mature redbait females (≥stage III) from selected trawl shots were retained and either preserved whole (2006) or measured fresh and ovaries preserved (2004 and 2005) in FAACC (10% formalin, 5% glacial acetic acid and 1.3% calcium chloride). Fish that were preserved whole were slit from vent to ventral cradle to assist gonad preservation. Representatives of the immature gonad stages and additional selected females with hydrated oocytes were also preserved in FAACC, the latter to supplement those used for fecundity estimation. These fish were identified separately from those individuals that were sampled randomly. Further methodology specific to work on redbait, can be found in the published paper.

Notes

Credit
Fisheries Research and Development Corporation (FRDC): 2004/039

Credit
Australian Fisheries Management Authority

Purpose
Characterise population structure and inform on fishery impacts.

Created: 20 08 2008

This dataset is part of a larger collection

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text: westlimit=147.1; southlimit=-43.6; eastlimit=147.5; northlimit=-43.0

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global : ad319b70-6e63-11dd-9d1e-00188b4c0af8