The exploitation of Upogebia africana (Crustacea: Thalassinidae) for bait in the Knysna Estuary

Hodgson, A.N. and Allanson, B.R. and Cretchley, R. (2000) The exploitation of Upogebia africana (Crustacea: Thalassinidae) for bait in the Knysna Estuary. Transactions of the Royal Society of South Africa, 55 (2). pp. 197-204. ISSN 0035-919X

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Abstract

The activities of people collecting Upogebia africana for bait at six popular collecting sites in the Knysna Estuary were monitored from February 1995 until April 1996. Three groups of bait harvesters were identified on the basis of their source of income: subsistence fishers who rely on bait collecting and fishing for their income; supplementary fishers who catch fish to supplement their income; leisure anglers who draw no income from fishing. Two groups of collectors were identified based on methods of collecting bait and fishing: leisure anglers who collect bait using a prawn pusher or pump and fish using a rod and tackle; non-leisure fishers who collect using tin cans and fish with hand or planted lines. The average harvest of bait per collecting trip by leisure anglers was 59 mud prawns, whereas non-leisure fishers took 101 animals, twice the legal limit. The numbers of bait collectors present per mud bank were found to be highest on public holidays ([horizontal bar over]X = 43.5) and higher during the summer holidays ([horizontal bar over]X = 16.5) than during the spring/summer ([horizontal bar over]X = 8.6) and autumn/winter ([horizontal bar over]X = 4.6) periods. Most collectors spent 11-30 minutes on the mud banks. It was estimated that 1.86 x 10[superscript 6] U. africana or about 740 kg (dry mass) was removed by bait collectors annually from the six bait-collecting sites studied. This represented about 8.5% of the mud prawn stocks at these sites and about 0.9% of the entire estuary stock. 85% of the mud prawns taken as bait was removed by 77% of the bait collectors who were the non-leisure fishers.

Item Type:Article
Additional Information:This was a Special Issue called: The Knysna Basin Project 1995-1998 : A Scientific Report on the Knysna Estuary
Uncontrolled Keywords:Callianassa-kraussi; bait collecting; Cape; Knysna Estuary; South Africa
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Zoology & Entomology
ID Code:384
Deposited By:INVALID USER
Deposited On:20 Oct 2006
Last Modified:06 Jan 2012 16:18
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