Data Trawler - Project details

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Project details

Title: Orange Roughy Assessment 1997-1999
Id: 1277
Acronym: Orange Roughy Assessment
Investigator(s): Rudy Kloser
CSIRO Oceans & Atmosphere - Hobart [details]

Years: 1997 to 1999
Hierachy: Multiple Use Management of EEZ (MUMEEZ) Program » Regional Marine Ecosystems & Fishery Dynamics » Shelf Ecosystem Processes

List of surveys that this project was on.

Use [details] link to view survey details (map, reports, metadata etc) including links to download data.

Survey InvestigatorDescription
SS 03/99

R. Kloser (CSIRO) This information was taken from the Cruise Plan
Biomass of the orange roughy and study of its deep-water seamount habitat off the east coast of Tasmania.
The orange roughy fishery remains the most valuable component of the South-East Fishery (SEF, and the validity of the current estimates of stock status need to be clarified
Cruise Objectives
1.To assess the biomass of orange roughy based on acoustic surveys on the Eastern Zone fishing grounds (St Helens and St Patricks) during the spawning period using industry vessel acoustics over an extended 4 week period and the CSIRO acoustic package during the anticipated peak spawning period.
2.To compare the sensitivity and precision of acoustic surveys using scientific vessel-mounted and towed-body acoustics and industry vessel-mounted acoustics at various frequencies.
3.To further develop the acoustic method by improving the multi-frequency technique for species identification: sound absorption coefficient and in-situ target strengths.
4.Map significant deep-water seabed habitats using the towed deep-water video camera and towed acoustic system and further develop the technique with experiments in shallow water.
5.Identify the composition of distinct bio-acoustic scattering layers with underway multi-frequency acoustic data and target sampling with a pelagic trawl capable of depth stratified sampling.
6.To conduct a preliminary survey of the orange roughy on the South Tasman Rise spawning hill.
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