Diet and feeding ecology of two sizes of Barbodes gonionotus (=Puntius gonionotus) and Oreochromis sp. in ricefields in Bangladesh

Haroon, A.K.Y. (1998) Diet and feeding ecology of two sizes of Barbodes gonionotus (=Puntius gonionotus) and Oreochromis sp. in ricefields in Bangladesh. Naga, the ICLARM Quarterly, 21(3), pp. 13-19.

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Abstract

Fish culture experiments were conducted to compare and evaluate the feeding pattern and strategies, daily ration, gastric evacuation rates, dietary breadth, similarity and overlap of silver barb, Barbodes gonionotus, and tilapia, Oreochromis sp. (natural hybrid of O. mossambicus x O. niloticus) in a rice-fish system. B. gonionotus was found to be a macrophtophagous column feeder while Oreochromis sp. was a detrivorous benthophagic browser. Ontogenic shifts in diet were clearly observed in B. gonionotus while absent in Oreochromis sp. For both species, daily food ration for the small fish was twice as large as that for the large fish. Mean rates of gastric evacuation were 0.18 h super(1) for small and 0.05 h super(1) for large B. gonionotus and 0.09 h super(1) and 0.14h super(1) for small and large Oreochromis sp., respectively. In terms of intraspecific dietary width, the smaller sized individuals of both species had a wider dietary niche than the larger conspecifics. Larger fish increased their specialization and reliance on few food items with increasing size and competitive ability. When both species were reared together, B. gonionotus showed a wider niche width than tilapia. Wider interspecific niche width of B. gonionotus compared to that of tilapia and significant interspecific dietary overlap is likely to result in suppression of the growth of tilapia in mixed culture due to: 1) a high degree of specialization and reliance of tilapia on food of low-nutrient value, and 2) slower gastric evacuation rates as compared to B. gonionotus, which would allow B. gonionotus to outgrow similar sized tilapia.

Item Type: Article
Title: Diet and feeding ecology of two sizes of Barbodes gonionotus (=Puntius gonionotus) and Oreochromis sp. in ricefields in Bangladesh
Personal Creator/Author:
CreatorsEmail
Haroon, A.K.Y.
Journal or Publication Title: Naga, the ICLARM Quarterly
Volume: 21
Number: 3
Page Range: pp. 13-19
Date: 1998
ISSN: 0116-290X
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Feeding behaviour; Diets; Rice field aquaculture; Integrated farming; Feeding experiments; Bangladesh; Barbodes gonionotus; Puntius gonionotus; Oreochromis
Subjects: Aquaculture
Item ID: 9231
Depositing User: Mr William Ko
Date Deposited: 29 Nov 2012 10:39
Last Modified: 29 Nov 2012 10:39
URI: http://aquaticcommons.org/id/eprint/9231

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