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Title: Variation of water transparency in semi-intensive fish tank over time
Authors: OKONJI, V. A.
Keywords: Monoculture
Culture system
Water transparency
Issue Date: 2012
Publisher: Bioscience Research Journal
Citation: © 2012 Nigerian Society for Experimental biology Printed in Nigeria http://www.mseb org/brj
Series/Report no.: 24;2
Abstract: The variation of water transparency in the monoculture and polyculture of Oreochromis niloticus and Clarias gariepinus was carried out at the Department of Fisheries Experimental Tanks, University of Benin, Benin City, Edo State, Nigeria. Six concrete tanks of 2.26 x 1.79 x 0.9m dimension each were .used. The tanks were stocked as monoiculture of Clarias gariepinus, monoculture of Oreochromis niloticus and polyculture of Clarias gariepinus and Oreochromis niloticus as treatments. Each tank was stocked at the rate of 10 fishes/m2 as semi-intensive culture system. Each tank was fertilized with organic and inorganic fertilizer and stocked fish were fed with 35% crude protein formulated diet it 5% body weight of fish daily. Each treatment was replicated twice. The water transparency was taken daily. The result of experiment showed that there was a significant difference for in the sechi disk reading for the various species combination at 5% probability level (p<0.05). The result showed that monoculture of Oreochromis niloticu recorded higher mean water transparency (31.75) and indicated lower algae population and better water quality. This was followed by polyculture of O. niloticus and C. gariepinus (27.33cm) and the least was monoculture of C. gariepinus (23.49cm). The result was attributed to the fact that O. niloticus is a filter feeding planktivore that utilizes the algae better than C. gariepinus. Monoculture of O. niloticus is recommended for farms with high organic particles and algae with insufficient water for flushing to reduce turbidity.
ISSN: 0795-8072/2012
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