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

Hodgson, Alan N; Allanson, Brian R; Cretchley, Robyn

Title: The exploitation of Upogebia africana (Crustacea: Thalassinidae) for bait in the Knysna Estuary
Creator: Hodgson, Alan N
Creator: Allanson, Brian R
Creator: Cretchley, Robyn
Date Issued: 2000
Date: 2000
Type: Article
Identifier: vital:6924
Identifier: http://hdl.handle.net/10962/d1011911
Description: 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.
Format: 8 pages
Format: pdf
Language: English
Relation: 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.

Hits: 782
Visitors: 917
Downloads: 140

Collections

Allanson, Brian Robert (Distinguished Fellow Emeritus Professor)

Hodgson, Alan N (Prof)

RU Department of Zoology and Entomology

SDG 14. Life Below Water

		Thumbnail	File	Description	Size	Format
View Details Download			SOURCEPDF	PDF	179 KB	Adobe Acrobat PDF	View Details Download