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Underwater measurement of trawl gear in operation

Project number: 1978-044
Project Status:
Completed
Budget expenditure: $0.00
Organisation: Department of Primary Industries and Regional Development (NSW)
Project start/end date: 28 Dec 1979 - 31 Dec 1979
Contact:
FRDC
TAGS
Fishing Technology
Fishing Gear

Objectives

1. Acquire and install a complete instrument package (a) to make simultaneous measurements of trawl door spread, wing spread & headline height of bottom & pelagic trawls used during survey work
2. to make similar measurements on commercial trawl gear

Final report

Author: T.B. Gorman K.J. Graham
Final Report • 1979-12-31 • 968.01 KB
1978-044-DLD.pdf

Summary

The objective of this report was to measure trawling gear with the Trawl Instrumentation System (TIS).

The method was similar to that described in Cruise Report no. 76. Each net and door combination was towed at various log speeds, and was maintained at each log speed for about 20 minutes while ground speeds were calculated using radar and/or satellite navigator fixes. When possible, reciprocal trawls were carried out in opposite directions.

No problems were encountered with the TIS and clear readings were obtained during all trawls.

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