A study of the length at maturity and hooks/gill net mesh selection in Clarias lazera from Lake Chad

Sagua, V.O. and Gubio, A. (1986) A study of the length at maturity and hooks/gill net mesh selection in Clarias lazera from Lake Chad. In: 3rd Annual Conference of the Fisheries Society of Nigeria (FISON) , 22-25 February, 1983 ,Maiduguri, Nigeria, pp. 193-199.

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Abstract

The minimum length at first maturity of Clarias lazera was found to be 24 cm (4.8%) for females and 20 cm (1.8%) for males. Fifty percent maturity was attained at length of 28 cm to 30 cm for both sexes; there being little difference among the sexes at this level of maturity. The modal retention lengths for gill nets were: 13 cm for 25.5 mm mesh; 18 cm for 32 mm mesh; 28 cm for 57 mm mesh; and 38 cm for 76 mm mesh. Modal lengths of Clarias lazera caught by various hooks sizes were No. 10 (28 cm); No. 11 (33 cm); Nos. 15 and 16 (28 cm). It is recommended that to protect the clarias fishery in Lake Chad, the use of gill nets of less than 57 mm mesh size and fishing hook No. 16 (and smaller sizes) which caught 43.94% of immature fishes should be discouraged

Item Type: Conference or Workshop Item
Title: A study of the length at maturity and hooks/gill net mesh selection in Clarias lazera from Lake Chad
Personal Creator/Author:
CreatorsEmail
Sagua, V.O.
Gubio, A.
Page Range: pp. 193-199
Date: 1986
Event Title: 3rd Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: Maiduguri, Nigeria
Event Dates: 22-25 February, 1983
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria, Lake Chad; fishery management; lake fisheries; mesh selectivity; population structure; size distribution; Clarias lazera;
Subjects: Fisheries
Biology
Item ID: 3442
Depositing User: Ms Maria Kalentsits
Date Deposited: 28 May 2010 19:20
Last Modified: 29 Sep 2011 17:24
Related URLs:
URI: http://aquaticcommons.org/id/eprint/3442

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