Comparative study of hatching rates of African catfish (Clarias gariepinus Burchell 1822) eggs on different substrates

Macharia, S.K. and Ngugi, C.C. and Rasowo, J. (2005) Comparative study of hatching rates of African catfish (Clarias gariepinus Burchell 1822) eggs on different substrates. Naga, Worldfish Center Quarterly, 28(3-4), pp. 23-26.

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Abstract

The hatching rates of African catfish (Clarias gariepinus) eggs on four natural substrates: the roots of Nile cabbage (Pistia stratiotes), water hyacinth (Eichhornia crassipes), pond weed (Ceratophyllum dermasum) and green grass leaves (Commelina sp.), and four artificial substrates: sisal mats, nylon mats, papyrus mats and kakaban mats, was assessed. Concrete slabs were used as control. The natural substrates performed better than the artificial ones. Pistia roots gave the best mean hatching rate of 66.2 ± 3.62%. Green grass leaves were second with a mean rate of 54.0 ± 3.46%, water hyacinth was third with 49.7 ± 3.16% and Ceratophyllum fourth with a mean of 13.0 ± 2.37%. Concrete slabs gave a mean rate of 18.6 ± 2.8%, sisal mats 18.6 ± 2.0%, papyrus 12.2 ± 1.2% and kakaban 11.8 ± 1.9%. Nylon mats were the last, with a mean rate of 4.0 ± 0.7%. The best performing natural substrates were those with the ability to float and thin fibrous roots that seemed to allow higher aeration of the eggs during incubation. The cost of using natural substrates was minimal.

Item Type: Article
Title: Comparative study of hatching rates of African catfish (Clarias gariepinus Burchell 1822) eggs on different substrates
Personal Creator/Author:
CreatorsEmail
Macharia, S.K.
Ngugi, C.C.
Rasowo, J.
Journal or Publication Title: Naga, Worldfish Center Quarterly
Volume: 28
Number: 3-4
Page Range: pp. 23-26
Date: 2005
ISSN: 1511-8533
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Hatching; Seed production; Fish eggs; Clarias gariepinus
Subjects: Aquaculture
Item ID: 9322
Depositing User: Mr William Ko
Date Deposited: 01 Dec 2012 06:33
Last Modified: 01 Dec 2012 06:33
URI: http://aquaticcommons.org/id/eprint/9322

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