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Project details

Title: The effects of trawl design on bycatch and benthos in prawn and finfish fisheries (FRDC project no. 93/179)1993-1998
Id: 1482
Acronym: Effects of trawl design on bycatch and benthos
Investigator(s): Steve Blaber
CSIRO Oceans & Atmosphere - Dutton Park [details]

Description:
Years: 1993 to 1998
Hierachy: Tropical & Pelagic Ecosystems Program » Tropical Ecosystems » Fish Conservation Biology

Publications

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Data


List of surveys that this project was on. Click on column header to sort.

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

Survey InvestigatorDescription
SS 10/95

[details]
J. Salini (CSIRO) Southern Surveyor cruise SS 10/95 was undertaken to test devices for the Bycatch Reduction in Prawn Trawls project in the area of the tiger prawn fishery west of Weipa, Gulf of Carpentaria. Aims of the cruise were to conduct prawn and fish bycatch reduction/video comparison trawls; EFN (environmentally friendly net) trawls, shark longlining, and to collect samples for the Hobart genetics group.
The night time prawn trawling was carried out 5 nm west of Duyfken Point and day time trawling in waters further west. Five bycatch reduction devices (BRDs) and a control or standard prawn net codend were tested and four of these BRDs were compared intensively. Daytime fish trawling with the EFN were carried out in waters 25 nm west of Duyfken Point. Video images were obtained of fish behaviour in the BRD codends of the prawn net and the EFN, and of the performance of the EFN over benthic structure. Samples collected included bycatch species for reference specimens and saurids for the Hobart genetics group. Longlining was successfully used to demonstrate its effectiveness at obtaining large numbers of sharks over short time intervals including dyed bait experiments.
SS 02/95

[details]
J. Salini (CSIRO) Southern Surveyor cruise SS 02/95 was undertaken to test devices for the Bycatch Reduction in Prawn Trawls project in the area of the tiger prawn fishery west of Weipa, Gulf of Carpentaria. Aims of the cruise were to conduct prawn and fish bycatch reduction/video comparison trawls; EFN (environmentally friendly net) trawls, multi-level beam trawls, and to collect samples for other research groups.
The night time prawn trawling was carried out 5 nm west of Duyfken Point and day time trawling in waters further west. Eight bycatch reduction devices and a control or standard prawn net codend were tested and the five most successful BRDs were compared intensively. Daytime fish trawling with the EFN were carried out in waters 25 nm west of Duyfken Point. Video recordings were also obtained to observe fish behaviour in the nets during trawling.
Samples collected included 130 fish specimens for the Hobart Fish Taxonomy Group's Handbook of Commercial Fishes, scombrids and cephalopds collected for QDPI Fisheries, tissue samples from L. malabaricus, L. sebae and other species were obtained for population genetic studies for the Hobart genetics group, sponges and invertebrates were collected for Queensland Museum and AIMS, and 3 species of Thenus were collected for University of Queensland. Successful deployment and retrieval of the AIMS acoustic recorder was also conducted in the area and 11 turtles were tagged during prawn trawling.
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