Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds

In south Asia, most indigenous carp species rely mostly on natural food and therefore these species are commonly cultured in semi-intensive polyculture system. Generally, a combination of 5-8 species is stocked and most of the cases farmers are very disappointed due to slow growth rate of fish. Howe...

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Main Authors:	Rahman, Mohammad Mustafizur, Verdegem, Marc C.J., Wahab, Md Abdul, Hossain, M. Y., Jo, Qtae, Gong, Yeong
Format:	Conference or Workshop Item
Language:	English
Published:	2008
Subjects:	SH Aquaculture. Fisheries. Angling
Online Access:	http://irep.iium.edu.my/38148/ http://irep.iium.edu.my/38148/1/Korea_2008.pdf

id	iium-38148
recordtype	eprints
spelling	iium-381482014-09-22T08:03:40Z http://irep.iium.edu.my/38148/ Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds Rahman, Mohammad Mustafizur Verdegem, Marc C.J. Wahab, Md Abdul Hossain, M. Y. Jo, Qtae Gong, Yeong SH Aquaculture. Fisheries. Angling In south Asia, most indigenous carp species rely mostly on natural food and therefore these species are commonly cultured in semi-intensive polyculture system. Generally, a combination of 5-8 species is stocked and most of the cases farmers are very disappointed due to slow growth rate of fish. However, they do not understand the real cause and complain about the complexity of managing many species in a culture system. Therefore, nowadays farmers have a tendency to use fewer species. Experimental manipulation of stocking densities suggest greater yields and comparatively better water quality occur when 1.5 rohu (Labeo rohita) are cultured with 0.5 common carp (Cyprinus carpio) per m2. To increase further fish production using limited resource and by exploiting excess natural food, addition of tilapia (Oreochromis nilotica) in low density (0.2 m-2) was suggested. Therefore, the aim of the present study was to know the effects of tilapia addition on pond environment and its effects on phytoplankton and fish growth in rohu-common carp polyculture system. Artificially fed and non-fed ponds were also compared. The 4.5-months experiment was carried out at the Bangladesh Agricultural University. Four treatments, randomly assigned and in triplicate, were compared: 1.5 rohu plus 0.5 common carp m-2 without (treatment 0T) and with artificial feed (0T-F), and 1.5 rohu plus 0.5 common carp plus 0.2 tilapia m-2 without (T) and with artificial feed (T-F). The results showed that NO3-N, total ammonia-nitrogen (TAN), total nitrogen (TN), PO4-P and total phosphorous (TP) concentrations were greater (P<0.05) in tilapia ponds than the ponds without tilapia. The opposite results were observed in case of Chlorophyll-a (Chl-a) and TSS due to tilapias high grazing pressure on phytoplankton. Artificial feeding lowered DO, total alkalinity and transparency of water, whereas the opposite results were observed in case of NO3-N, TAN, TN, PO4-P, TP, TSS and Chl-a concentrations. Tilapia decreased the effects of artificial feed on Chl-a (Fig. 1) and TSS concentrations. Tilapia had no significant effect on any yield parameter of rohu and common carp. All yield parameters of rohu, common carp and tilapia were better (P<0.01) in fed than non-fed ponds. Combined effects of tilapia addition and artificial feed resulted highest total net fish yield in treatment T-F (P<0.05) (Fig. 2). Therefore, a combination of 1.5 rohu plus 0.5 common carp plus 0.2 tilapia m-2 with artificial feed may be used for polyculture farmers in south Asian region. 2008 Conference or Workshop Item NonPeerReviewed application/pdf en http://irep.iium.edu.my/38148/1/Korea_2008.pdf Rahman, Mohammad Mustafizur and Verdegem, Marc C.J. and Wahab, Md Abdul and Hossain, M. Y. and Jo, Qtae and Gong, Yeong (2008) Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds. In: World Aquaculture 2008, 23 May 2008, Busan, Korea. (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	SH Aquaculture. Fisheries. Angling
spellingShingle	SH Aquaculture. Fisheries. Angling Rahman, Mohammad Mustafizur Verdegem, Marc C.J. Wahab, Md Abdul Hossain, M. Y. Jo, Qtae Gong, Yeong Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds
description	In south Asia, most indigenous carp species rely mostly on natural food and therefore these species are commonly cultured in semi-intensive polyculture system. Generally, a combination of 5-8 species is stocked and most of the cases farmers are very disappointed due to slow growth rate of fish. However, they do not understand the real cause and complain about the complexity of managing many species in a culture system. Therefore, nowadays farmers have a tendency to use fewer species. Experimental manipulation of stocking densities suggest greater yields and comparatively better water quality occur when 1.5 rohu (Labeo rohita) are cultured with 0.5 common carp (Cyprinus carpio) per m2. To increase further fish production using limited resource and by exploiting excess natural food, addition of tilapia (Oreochromis nilotica) in low density (0.2 m-2) was suggested. Therefore, the aim of the present study was to know the effects of tilapia addition on pond environment and its effects on phytoplankton and fish growth in rohu-common carp polyculture system. Artificially fed and non-fed ponds were also compared. The 4.5-months experiment was carried out at the Bangladesh Agricultural University. Four treatments, randomly assigned and in triplicate, were compared: 1.5 rohu plus 0.5 common carp m-2 without (treatment 0T) and with artificial feed (0T-F), and 1.5 rohu plus 0.5 common carp plus 0.2 tilapia m-2 without (T) and with artificial feed (T-F). The results showed that NO3-N, total ammonia-nitrogen (TAN), total nitrogen (TN), PO4-P and total phosphorous (TP) concentrations were greater (P<0.05) in tilapia ponds than the ponds without tilapia. The opposite results were observed in case of Chlorophyll-a (Chl-a) and TSS due to tilapias high grazing pressure on phytoplankton. Artificial feeding lowered DO, total alkalinity and transparency of water, whereas the opposite results were observed in case of NO3-N, TAN, TN, PO4-P, TP, TSS and Chl-a concentrations. Tilapia decreased the effects of artificial feed on Chl-a (Fig. 1) and TSS concentrations. Tilapia had no significant effect on any yield parameter of rohu and common carp. All yield parameters of rohu, common carp and tilapia were better (P<0.01) in fed than non-fed ponds. Combined effects of tilapia addition and artificial feed resulted highest total net fish yield in treatment T-F (P<0.05) (Fig. 2). Therefore, a combination of 1.5 rohu plus 0.5 common carp plus 0.2 tilapia m-2 with artificial feed may be used for polyculture farmers in south Asian region.
format	Conference or Workshop Item
author	Rahman, Mohammad Mustafizur Verdegem, Marc C.J. Wahab, Md Abdul Hossain, M. Y. Jo, Qtae Gong, Yeong
author_facet	Rahman, Mohammad Mustafizur Verdegem, Marc C.J. Wahab, Md Abdul Hossain, M. Y. Jo, Qtae Gong, Yeong
author_sort	Rahman, Mohammad Mustafizur
title	Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds
title_short	Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds
title_full	Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds
title_fullStr	Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds
title_full_unstemmed	Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds
title_sort	environmental effects of tilapia (oreochromis nilotica l.) and artificial feeding on phytoplankton and fish yield in polyculture ponds
publishDate	2008
url	http://irep.iium.edu.my/38148/ http://irep.iium.edu.my/38148/1/Korea_2008.pdf
first_indexed	2023-09-18T20:54:46Z
last_indexed	2023-09-18T20:54:46Z
_version_	1777410230363095040

Environmental effects of tilapia (Oreochromis nilotica L.) and artificial feeding on phytoplankton and fish yield in polyculture ponds

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