Some reproductive aspects of Chrysichthys nigrodigitatus (Lacépède) from Cross River, Nigeria

Ekanem, S.B. (2000) Some reproductive aspects of Chrysichthys nigrodigitatus (Lacépède) from Cross River, Nigeria. Naga, the ICLARM Quarterly, 23(2), pp. 24-28.

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Official URL: http://www.worldfishcenter.org/Naga/23-2/fb1.pdf

Abstract

Between May and October 1990, fecundity, egg size and condition factor of Chrysichthys nigrodigitatus (Lacépède) in the Cross River, Nigeria, were studied. The fecundity (F) of this population varied from 3 046 eggs (total length, L=28.5 cm) to 28 086 eggs (L=64 cm). A mean relative fecundity of 231 eggs/cm or 13 eggs/g of fish was obtained for this population. The fecundity of this population can be estimated with the formula F=2.511 · L 2.30 or F=52.893 · W 0.78 , total length being in cm and weight (W) in g. The mean egg diameter of this population varied from 0.65 mm to 3.54 mm. Condition factor (CF) of the population varied from 0.24 to 1.34 with 0.977 as the mean; 52.8% had CF higher than the mean and 47% had CF above unity. Smaller fish in this population were in better condition than bigger ones. The egg size and condition factor obtained in this study are evidence that the Cross River population of C. nigrodigitatus can provide excellent broodstock.

Item Type: Article
Title: Some reproductive aspects of Chrysichthys nigrodigitatus (Lacépède) from Cross River, Nigeria
Personal Creator/Author:
CreatorsEmail
Ekanem, S.B.
Journal or Publication Title: Naga, the ICLARM Quarterly
Volume: 23
Number: 2
Page Range: pp. 24-28
Date: 2000
ISSN: 0116-290X
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Brood stocks; Reproduction; Fecundity; Nigeria; Chrysichthys nigrodigitatus
Subjects: Aquaculture
Item ID: 9175
Depositing User: Mr William Ko
Date Deposited: 28 Nov 2012 07:59
Last Modified: 28 Nov 2012 07:59
URI: http://aquaticcommons.org/id/eprint/9175

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