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Catching characteristics of four fish-trap types on the North West Shelf of Australia


Whitelaw, AW and Sainsbury, K and Dews, GJ and Campbell, RA, Catching characteristics of four fish-trap types on the North West Shelf of Australia, Australian Journal of Marine and Freshwater Research, 42, (4) pp. 369-382. ISSN 0067-1940 (1991) [Refereed Article]

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Copyright 1991 CSIRO

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Commercial catch rates for the North West Shelf trap fishery, at up to 10 kg trap-' h-', are considerably greater than those reported for similar trap fisheries elsewhere. Two fish-trapping experiments were conducted off Lowendal Island (north-western Australia) to study the catch rates of four trap types (0-, S- and Z-shaped and rotational) and two bait types (pilchard, Sardinops neopilchardus, and emperor, Lethrznus choerorynchus) over various soak times (ranging from 1 to 24 h). Total catches varied significantly with soak time. Catches increased rapidly for the first 3 h, levelled off, and then decreased steadily to 16 h; there was a slight increase at 24 h. The species composition of the catch did not vary significantly with soak time. There was no significant difference in catch rates between trap types. The traps did not appear to cause fish to die by being confined in the traps for extended periods. A fairly large amount of suitable bait (about 4 kg) was necessary for effective trapping of fish. The catch rates of the pilchard bait were significantly higher than those of the emperor bait. Over extended soak times (more than 3 h), pilchard bait was lost at a rate of about 6% h-'. >.:hereas there was no detectable loss of emperor bait.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries sciences not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught fin fish (excl. tuna)
UTAS Author:Sainsbury, K (Professor Keith Sainsbury)
ID Code:73191
Year Published:1991
Web of Science® Times Cited:42
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2011-09-20
Last Modified:2011-09-27

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