Project number: 1997-147
Project Status:
Budget expenditure: $144,564.00
Principal Investigator: Jeremy D. Prince
Organisation: Biospherics Pty Ltd
Project start/end date: 22 Jun 1997 - 1 Oct 1998


In 1997 1,000t will be allocated amongst the South East Trawl fishery, individual allocations will vary from over 100t down to 100s of kg. These allocations will allow some targeted fishing for gemfish but operators will also have to manage their individual allocations to cover their anticipated bycatch of gemfish as they fill quotas for other species. This management of bycatch will bias reported commercial catch rates in 1997 preventing comparison with historic trends and the updating of the stock assessment developed by EGAG during 1996.

Consequently EGAG considered that another Industry Survey in 1997 is needed for two principal reasons:
1. To provide catch rate data which is representative of targeted gemfish fishing.
2. To ensure timely provision of high quality data for stock assessment during September and October 1997.

However having decided on the need for the 1997 survey EGAG considered that two other lesser needs could be addressed for little additional expense. These are:
A. to understand targeting patterns in the SEF and their impact on stock assessment and
B. the influence of oceanographic factors on the South East Fishery.


1. Catch and effort and length-frequency data for targeted eastern gemfish fishing during the 1997 season will supplied in Excel spreadsheets will be supplied to EGAG before 1 September 1997.
2. The targeting practices of four survey vessels
Charissa, Marina Star, Illawara Star and Santa Rosa II during the 1997 season will be documented and analysed in relationship to previously reported targeting patterns.
3. The relationship between gemfish aggregations and oceanographic features during 1997 will be documented and analysed.
4. The feasibility of using multi-frequency acoustics to measure the size of gemfish aggregations will be analysed.

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