Data

Management options to minimise formation of urchin barrens: timed lobster swims - assessment of lobster size and abundance in south-eastern Tasmania

Name: Management options to minimise formation of urchin barrens: timed lobster swims - assessment of lobster size and abundance in south-eastern Tasmania
Published: 2011

University of Tasmania, Australia

Johnson, Craig, Prof. ; Ling, Scott, Dr ; Sanderson, Craig, Dr

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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://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/e6e0a5b6-6e6e-4c95-8730-e2337333b29c&rft.title=Management options to minimise formation of urchin barrens: timed lobster swims - assessment of lobster size and abundance in south-eastern Tasmania&rft.identifier=https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/e6e0a5b6-6e6e-4c95-8730-e2337333b29c&rft.description=Characterisation of lobster (Jasus edwardsii) abundance and change in abundance at three different sampling sites (Cape Paul Lemanon, North Bay and Fortescue Bay) on the south-east coast of Tasmania, was assessed by GPS tracked SCUBA diver swims of 60 minutes in length whereby GPS was logged approximately every 5 seconds. Large tagged Rock Lobsters were introduced into one of the sampling sites, North Bay (which was closed to fishing). The swims are also being used to assess the impact of reef closure on the local lobster population.Maintenance and Update Frequency: notPlannedStatement: At each of the three south-east sites, 4 timed lobster swims were conducted per sampling occasion. Additional swims were conducted at North Bay, in an attempt to obtain more tag re-sightings for translocated lobsters. A GPS device floating on the surface logging at 5 second intervals was tethered to and towed by a diver in order to track the swim survey. The diver synched GPS time with dive computer/ wrist watch and recorded time at which lobsters were sighted (which was then corroborated with the GPS time to obtain a lat, lon). The swim direction was parallel to the coast line (along shore) whilst trying to maintain a steady depth and course. The duration of each swim is 60 minutes bottom time. Whilst trying to maintain a constant speed (about 0.25 m/s), it was a priority to look carefully into crevices and under big boulders, places where rock lobsters usually hide and aggregate for protection. When a lobster was found the diver recorded the time and depth of the encounter and estimated Lobster carapace length (mm). If the conditions permitted (no risk to lobster’s health), the diver caught the lobster to record sex and measure its carapace length using callipers. If the lobster was tagged, the tag number was also recorded. The lobster was returned to the same spot where it was found.Statement: GPS used datum WGS84.&rft.creator=Johnson, Craig, Prof. &rft.creator=Ling, Scott, Dr &rft.creator=Sanderson, Craig, Dr &rft.date=2011&rft.coverage=westlimit=147.5; southlimit=-43.5; eastlimit=148; northlimit=-42.5&rft.coverage=westlimit=147.5; southlimit=-43.5; eastlimit=148; northlimit=-42.5&rft.coverage=uplimit=20; downlimit=5&rft.coverage=uplimit=20; downlimit=5&rft_rights=Creative Commons Attribution-Share Alike 2.5 Australia License http://creativecommons.org/licenses/by-sa/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. Data will be available upon publication.&rft_rights=The data described in this record are the intellectual property of University of Tasmania through the Institute for Marine and Antarctic Studies&rft_subject=biota&rft_subject=Oceans | Marine Biology | Marine Invertebrates&rft_subject=REEF HABITAT&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=AQUATIC ECOSYSTEMS&rft_subject=MARINE HABITAT&rft_subject=COMMUNITY STRUCTURE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=COMMUNITY DYNAMICS&rft_subject=Jasus edwardsii&rft_subject=Abundance&rft_subject=Size&rft_subject=GPS locations&rft_subject=Marine and Estuarine Ecology (incl. Marine Ichthyology)&rft_subject=BIOLOGICAL SCIENCES&rft_subject=ECOLOGY&rft_subject=Aquatic Ecosystem Studies and Stock Assessment&rft_subject=AGRICULTURAL AND VETERINARY SCIENCES&rft_subject=FISHERIES SCIENCES&rft_subject=Carapace length&rft_subject=Sex&rft_subject=Depth&rft_subject=GPS location&rft.type=dataset&rft.language=English Access the data

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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).

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The data described in this record are the intellectual property of University of Tasmania through the Institute for Marine and Antarctic Studies

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Characterisation of lobster (Jasus edwardsii) abundance and change in abundance at three different sampling sites (Cape Paul Lemanon, North Bay and Fortescue Bay) on the south-east coast of Tasmania, was assessed by GPS tracked SCUBA diver swims of 60 minutes in length whereby GPS was logged approximately every 5 seconds. Large tagged Rock Lobsters were introduced into one of the sampling sites, North Bay (which was closed to fishing). The swims are also being used to assess the impact of reef closure on the local lobster population.

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Maintenance and Update Frequency: notPlanned

Statement: At each of the three south-east sites, 4 timed lobster swims were conducted per sampling occasion. Additional swims were conducted at North Bay, in an attempt to obtain more tag re-sightings for translocated lobsters. A GPS device floating on the surface logging at 5 second intervals was tethered to and towed by a diver in order to track the swim survey. The diver synched GPS time with dive computer/ wrist watch and recorded time at which lobsters were sighted (which was then corroborated with the GPS time to obtain a lat, lon). The swim direction was parallel to the coast line (along shore) whilst trying to maintain a steady depth and course. The duration of each swim is 60 minutes bottom time. Whilst trying to maintain a constant speed (about 0.25 m/s), it was a priority to look carefully into crevices and under big boulders, places where rock lobsters usually hide and aggregate for protection. When a lobster was found the diver recorded the time and depth of the encounter and estimated Lobster carapace length (mm). If the conditions permitted (no risk to lobster’s health), the diver caught the lobster to record sex and measure its carapace length using callipers. If the lobster was tagged, the tag number was also recorded. The lobster was returned to the same spot where it was found.

Statement: GPS used datum WGS84.

Notes

Credit
Juan Gabriel Dominguez Sarimento

Credit
Funding: FRDC project 2007/045

Purpose
Assessment of Management Options to Minimise Formation of 'Barrens' Habitat by the Long-Spined Sea Urchin (Centrostephanus rodgersii) in Tasmania

Created: 16 09 2011

Data time period: 11 2007 to 28 02 2011

This dataset is part of a larger collection

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text: westlimit=147.5; southlimit=-43.5; eastlimit=148; northlimit=-42.5

text: uplimit=20; downlimit=5

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global : e6e0a5b6-6e6e-4c95-8730-e2337333b29c