Data

Spotted Handfish (Brachionichthys hirsutus) - GPS Underwater Visual Census - 2014-2019 repeated population surveys

University of Tasmania, Australia
Lynch, Tim
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=http://metadata.imas.utas.edu.au/geonetwork/srv/eng/search?uuid=51702b57-d4e4-4477-b199-b3485675f66c&rft.title=Spotted Handfish (Brachionichthys hirsutus) - GPS Underwater Visual Census - 2014-2019 repeated population surveys&rft.identifier=http://metadata.imas.utas.edu.au/geonetwork/srv/eng/search?uuid=51702b57-d4e4-4477-b199-b3485675f66c&rft.description=Dive surveys were conducted in 2014 and the same sites resurveyed annually until 2019, to establish a baseline and monitor the status of the critically endangered spotted handfish (Brachionichthys hirsutus) population. This dataset is a summary of all surveys season 2014 to 2019 in which the 11 sites across the Derwent Estuary and D'Entrecasteaux Channel were assessed. The data describes the search effort (transect length, swathed area) and counts of handfish observed on each transect, including size measurements (total length) and depth records for each sighted fish. Note that the specific latitude and longitude of individual fish have been redacted due to the vulnerable status of the species. Contact the point of contact listed in this record for more information.Population surveys of spotted handfish (Brachionichthys hirsutus) were conducted during the non-breeding season (March – August) of 2014-2019. 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=Lynch, Tim &rft.date=2019&rft.coverage=northlimit=-42.87462; southlimit=-43.288; westlimit=147.082; eastLimit=147.44532&rft.coverage=northlimit=-42.87462; southlimit=-43.288; westlimit=147.082; eastLimit=147.44532&rft_rights=Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0&rft_subject=biota&rft_subject=Brachionichthys hirsutus&rft_subject=Coastal Waters (Australia) | Tasmania Coast East and Southeast, TAS&rft_subject=GPS (Global Positioning System)&rft_subject=Visual Counts/Observations&rft_subject=Underwater Surveys (acquisition and/or analysis)&rft_subject=ENDANGERED SPECIES&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=SPECIES/POPULATION INTERACTIONS&rft_subject=FISH&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=ANIMALS/VERTEBRATES&rft_subject=diver&rft_subject=Abundance of biota&rft_subject=Body length of Spotted Handfish&rft_subject=Depth of sighted Spotted Handfish&rft_subject=Stress response of fish&rft_subject=Start time of dive transect (local)&rft_subject=End time of dive transect (local)&rft_subject=Area of seafloor searched&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 4.0 International License
http://creativecommons.org/licenses/by/4.0

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Brief description

Dive surveys were conducted in 2014 and the same sites resurveyed annually until 2019, to establish a baseline and monitor the status of the critically endangered spotted handfish (Brachionichthys hirsutus) population. This dataset is a summary of all surveys season 2014 to 2019 in which the 11 sites across the Derwent Estuary and D'Entrecasteaux Channel were assessed. The data describes the search effort (transect length, swathed area) and counts of handfish observed on each transect, including size measurements (total length) and depth records for each sighted fish.

Note that the specific latitude and longitude of individual fish have been redacted due to the vulnerable status of the species. Contact the point of contact listed in this record for more information.

Lineage

Population surveys of spotted handfish (Brachionichthys hirsutus) were conducted during the non-breeding season (March – August) of 2014-2019. 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 and Energy (Funding)
Credit
Department of Primary Industries, Parks, Water and Environment (Funding)
Credit
National Environmental Science Program (NESP) Marine Biodiversity Hub (Funding)

Modified: 2019-03-12

Data time period: 2014-02-28 to 2017-07-05

147.44532,-42.87462 147.44532,-43.288 147.082,-43.288 147.082,-42.87462 147.44532,-42.87462

147.26366,-43.08131

text: northlimit=-42.87462; southlimit=-43.288; westlimit=147.082; eastLimit=147.44532

Other Information
(DATA ACCESS - detailed Spotted Handfish surveys 2014 - 2019 [direct download])

uri : https://geoserver.imas.utas.edu.au/geoserver/NESP/wfs

URI : https://geoserver.imas.utas.edu.au/geoserver/NESP/wfs?version=1.0.0&request=GetFeature&typeName=CSIRO_NESP_handfish_surveys&outputFormat=csv

(SUPPLEMENTARY DATA - Summary population statistics 1998 - 2019)

uri : https://data.imas.utas.edu.au/attachments/51702b57-d4e4-4477-b199-b3485675f66c/HFSummary1998_2019.csv

MAP - Spotted Handfish surveys (NESP:CSIRO_NESP_handfish_surveys_MAP)

uri : https://geoserver.imas.utas.edu.au/geoserver/NESP/wms

This OGC WFS service returns the data for download in subsettable CSV format. (CSIRO_NESP_handfish_surveys)

uri : https://geoserver.imas.utas.edu.au/geoserver/NESP/wfs

(REPORT - 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.)

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

(ASSOCIATED PUBLICATION - Lynch et al. 2015)

uri : https://publications.csiro.au/rpr/pub

URI : https://publications.csiro.au/rpr/pub?list=SEA&pid=csiro:EP151318

(ASSOCIATED PUBLICATION - Wong et al. 2018)

doi : https://doi.org/10.1371/journal.pone.0201518

Identifiers
  • global : 51702b57-d4e4-4477-b199-b3485675f66c