Data

Density estimates of Spotted Handfish (Brachionichthys hirsutus) - GPS Underwater Visual Census. 2015-2016

Australian Ocean Data Network
CSIRO O&A, Information & Data Centre (Point of contact) Data Officer (AR), Hobart (Processor of) Wong, Lincoln (Point of contact)
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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/b0c79329-a480-4762-a943-a902a74fc13e&rft.title=Density estimates of Spotted Handfish (Brachionichthys hirsutus) - GPS Underwater Visual Census. 2015-2016&rft.identifier=b0c79329-a480-4762-a943-a902a74fc13e&rft.publisher=Australian Ocean Data Network&rft.description=Dive surveys were conducted in 2015 and 2016 to establish a baseline and monitor the status of the critically endangered spotted handfish (Brachionichthys hirsutus) population. This dataset contains track records of variable length, GPS tracked underwater visual census transects conducted within 11 sites across the Derwent Estuary (n=9) and D'Entrecasteaux Channel (n=2). Records illustrated search effort (transect length, swathed area) and total fish sighted along each transect. Data were also presented in a standardised unit, with density estimates (fish per hectare [Ha]) extrapolated for each transect. In addition, this dataset also included information for each sighting of individual fish. This dataset contains size measurement (total length) and location (depth, latitude, longitude) records for each sighted fish.Progress Code: completedMaintenance and Update Frequency: asNeededStatement: Population surveys of spotted handfish (Brachionichthys hirsutus) were conducted during the non-breeding season (March – August) of 2015 and 2016. Surveys were conducted at 9 different location within the Derwent Estuary and 2 additional location in D'Entrecasteaux Channel. Data were collected using a variable length, GPS tracked underwater visual census method. Divers swam abreast approximately 0.5m-1m above the sediment to search for fish while towing a surface float with GPS housed onboard. The GPS tracked the position of the divers in real time and allowed extraction of spatial data post-hoc to determine searched distance to parameterise each transect. When B. hirsutus were located along the transect a series of photographs were taken to record the time of the sighting for cross-referencing with GPS spatial logs to determine the location of each sighting. The total length of each fish was measured to the nearest millimetre using a ruler placed laterally adjacent to the fish.&rft.creator=Anonymous&rft.date=2016&rft.coverage=westlimit=147.082; southlimit=-43.30168015640918; eastlimit=147.4453217478467; northlimit=-42.87462489881998; projection=WGS 84 (EPSG:4326)&rft.coverage=westlimit=147.082; southlimit=-43.30168015640918; eastlimit=147.4453217478467; northlimit=-42.87462489881998; projection=WGS 84 (EPSG:4326)&rft_rights= https://creativecommons.org/licenses/by-nc-sa/4.0/&rft_rights=https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Graphic&rft_rights=Attribution-NonCommercial-ShareAlike 4.0&rft_rights=WWW:LINK-1.0-http--related&rft_rights=License Text&rft_rights=Attribution-NonCommercial-ShareAlike 4.0&rft_rights= https://creativecommons.org/licenses/by-nc-sa/4.0/&rft_subject=biota&rft_subject=Brachionichthys hirsutus&rft_subject=Coastal Waters (Australia) | Tasmania Coast East and Southeast, TAS&rft_subject=Earth Science | Biosphere | Ecological Dynamics | Species/Population Interactions | Endangered Species&rft_subject=GPS (Global Positioning System)&rft_subject=Visual Counts/Observations&rft_subject=Underwater Surveys (acquisition and/or analysis)&rft.type=dataset&rft.language=English Access the data
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Brief description

Dive surveys were conducted in 2015 and 2016 to establish a baseline and monitor the status of the critically endangered spotted handfish (Brachionichthys hirsutus) population. This dataset contains track records of variable length, GPS tracked underwater visual census transects conducted within 11 sites across the Derwent Estuary (n=9) and D'Entrecasteaux Channel (n=2). Records illustrated search effort (transect length, swathed area) and total fish sighted along each transect. Data were also presented in a standardised unit, with density estimates (fish per hectare [Ha]) extrapolated for each transect. In addition, this dataset also included information for each sighting of individual fish. This dataset contains size measurement (total length) and location (depth, latitude, longitude) records for each sighted fish.

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Progress Code: completed
Maintenance and Update Frequency: asNeeded
Statement: Population surveys of spotted handfish (Brachionichthys hirsutus) were conducted during the non-breeding season (March – August) of 2015 and 2016. Surveys were conducted at 9 different location within the Derwent Estuary and 2 additional location in D'Entrecasteaux Channel. Data were collected using a variable length, GPS tracked underwater visual census method. Divers swam abreast approximately 0.5m-1m above the sediment to search for fish while towing a surface float with GPS housed onboard. The GPS tracked the position of the divers in real time and allowed extraction of spatial data post-hoc to determine searched distance to parameterise each transect. When B. hirsutus were located along the transect a series of photographs were taken to record the time of the sighting for cross-referencing with GPS spatial logs to determine the location of each sighting. The total length of each fish was measured to the nearest millimetre using a ruler placed laterally adjacent to the fish.

Notes

Credit
CSIRO
Credit
UTAS
Credit
Department of the Environment (Funding)
Credit
Department of Primary Industries, Parks, Water and Environment (Funding)
Credit
NESP Marine Biodiversity Hub (Funding)

Data time period: 2015-04 to 2016-11

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147.44532,-42.87462 147.44532,-43.30168 147.082,-43.30168 147.082,-42.87462 147.44532,-42.87462

147.26366087393,-43.088152527614

text: westlimit=147.082; southlimit=-43.30168015640918; eastlimit=147.4453217478467; northlimit=-42.87462489881998; projection=WGS 84 (EPSG:4326)

Subjects
Brachionichthys hirsutus | Coastal Waters (Australia) | Tasmania Coast East and Southeast, TAS | Earth Science | Biosphere | Ecological Dynamics | Species/Population Interactions | Endangered Species | GPS (Global Positioning System) | Underwater Surveys (acquisition and/or analysis) | Visual Counts/Observations | biota |

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Other Information
Lynch T, Green M and Davies C. 2015. Short communication: Diver towed GPS to estimate densities of a critically endangered fish. Biological Conservation 191:700-706. (Link to report - Lynch et al (2015))

doi : https://dx.doi.org/10.1016/j.biocon.2015.08.009

global : 948d7fac-7dfa-43d0-9969-aa66a765852d

Identifiers
  • global : b0c79329-a480-4762-a943-a902a74fc13e
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