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Density estimates of spotted handfish (Brachionichthys hirsutus) - GPS Underwater Visual Census (2015,2016)

Latest version published by CSIRO Oceans and Atmosphere on Jan 17, 2017 CSIRO Oceans and Atmosphere

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.

Data Records

The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 170 records.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Downloads

Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 170 records in English (9 KB) - Update frequency: unknown
Metadata as an EML file download in English (7 KB)
Metadata as an RTF file download in English (7 KB)

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Link to originating metadata record.

Rights

Researchers should respect the following rights statement:

The publisher and rights holder of this work is CSIRO Oceans and Atmosphere. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 87f387c3-cebd-43dc-9f88-c0ffab09766f.  CSIRO Oceans and Atmosphere publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Atlas of Living Australia.

Keywords

Occurrence; Observation

Contacts

Who created the resource:

Lincoln Wong
Research Technician
CSIRO Oceans and Atmosphere GPO Box 1538 7001 Hobart Tasmania AU +61 3 6232 5222

Who can answer questions about the resource:

Lincoln Wong
Research Technician
CSIRO Oceans and Atmosphere GPO Box 1538 7001 Hobart Tasmania AU +61 3 6232 5222

Who filled in the metadata:

Lincoln Wong
Research Technician
CSIRO Oceans and Atmosphere GPO Box 1538 7001 Hobart Tasmania AU +61 3 6232 5222

Who else was associated with the resource:

User
Lincoln Wong
Research Technician
CSIRO Oceans and Atmosphere GPO Box 1538 7001 Hobart Tasmania AU +61 3 6232 5222

Taxonomic Coverage

No Description available

Species  Brachionichthys hirsutus (Spotted handfish)

Temporal Coverage

Start Date / End Date 2015-04-23 / 2016-10-28

Sampling Methods

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.

Study Extent 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 locations in D'Entrecasteaux Channel.

Method step description:

  1. Repeat photos allowed georeferencing to the floating GPS unit

Additional Metadata

marine, harvested by iOBIS Original data contains accurate positions of the handfish, related environment data and images. Please consult with the custodian.