Data

Spotted Handfish (Brachionichthys hirsutus) - GPS Underwater Visual Census - 2014-2022 repeated population surveys (NESP MB A10; MaC 1.23)

Australian Ocean Data Network
Lynch, Tim
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
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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.Maintenance and Update Frequency: annuallyStatement: 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. 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Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_rights=The data described in this record are the intellectual property of CSIRO.&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=EARTH SCIENCE | BIOSPHERE | ECOLOGICAL DYNAMICS | SPECIES/POPULATION INTERACTIONS | ENDANGERED SPECIES&rft_subject=EARTH SCIENCE | BIOLOGICAL CLASSIFICATION | ANIMALS/VERTEBRATES | FISH&rft_subject=diver&rft_subject=Abundance of biota&rft_subject=National Environmental Science Program (NESP) Marine and Coastal Hub&rft.type=dataset&rft.language=English Access the data
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This dataset is hosted by the Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, on behalf of CSIRO through the National Environmental Science Program (NESP) Marine Biodiversity Hub and Marine and Coastal Hub.

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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).

The data described in this record are the intellectual property of CSIRO.

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Brief description

Dive surveys were conducted in 2014 and the same sites resurveyed annually until 2022 (excluding 2021), 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 2022 (excluding 2021) 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.

Lineage

Maintenance and Update Frequency: annually
Statement: 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 Climate Change, Energy, the Environment and Water (Funding)
Credit
Department of Primary Industries, Parks, Water and Environment (Funding)
Credit
National Environmental Science Program (NESP) Marine Biodiversity Hub (Funding)
Credit
National Environmental Science Program (NESP) Marine and Coastal Hub (Funding)

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

This dataset is part of a larger collection

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text: uplimit=20; downlimit=2

Subjects
Abundance of biota | Brachionichthys hirsutus | Coastal Waters (Australia) | Tasmania Coast East and Southeast, TAS | EARTH SCIENCE | BIOLOGICAL CLASSIFICATION | ANIMALS/VERTEBRATES | FISH | EARTH SCIENCE | BIOSPHERE | ECOLOGICAL DYNAMICS | SPECIES/POPULATION INTERACTIONS | ENDANGERED SPECIES | GPS (Global Positioning System) | National Environmental Science Program (NESP) Marine and Coastal Hub | Underwater Surveys (acquisition and/or analysis) | Visual Counts/Observations | biota | diver |

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Other Information
(SUPPLEMENTARY DATA - Summary population statistics 1998 - 2019)

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

(ASSOCIATED PUBLICATION - Assessment of conservations actions for the critically endangered spotted handfish (Brachionichthyidae), following curation of data collected by multiple investigators into a long-term time-series (Lynch et al. 2022))

doi : https://doi.org/10.1016/j.jnc.2022.126237

(ASSOCIATED PUBLICATION - Local densities and habitat preference of the critically endangered spotted handfish (Brachionichthys hirsutus): Large scale field trial of GPS parameterised underwater visual census and diver attached camera (Wong et al. 2018))

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

(ASSOCIATED PUBLICATION - Diver towed GPS to estimate densities of a critically endangered fish (Lynch et al. 2015))

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

global : 27625ece-a38a-400e-9a1e-857d88d85655

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