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Feeding selectivity and growth of Nile tilapia (Oreochromis niloticus L.) fed on temperate-zone aquatic macrophytes

Author

Listed:
  • I. Šetlíková

    (, Z. A 2 1Faculty of Biological Sciences, 2Research Institute of Fish Culture and Hydrobiology in Vodňany, University of South Bohemia, České Budějovice, Czech Republic)

  • Z. Adámek

    (, Z. A 2 1Faculty of Biological Sciences, 2Research Institute of Fish Culture and Hydrobiology in Vodňany, University of South Bohemia, České Budějovice, Czech Republic)

Abstract

Feeding selectivity of Nile tilapia (Oreochromis niloticus L.) juveniles (9.3-20.9 g) to four aquatic macrophyte species and tilapia growth were studied in 4 consecutive experiments. Plant diet was provided to 8 tanks containing 20 fishes for 5 days. The fish were fed a carp diet between 4 experiments for 14 days. The consumption of 4 aquatic macrophyte species differed significantly [F(3,252) = 39.6; P < 10-6]. Elodea canadensis was the most preferred plant (Chesson selectivity index = 0.50 ± 0.05, n = 4). Potamogeton pectinatus and Spirodela polyrhiza were consumed with about equal preference. Myriophyllum spicatum was the least preferred species. Elodea canadensis contained relatively more phosphorus, potassium and ash than the other three species. The daily plant dry weight intake ranged between 0.79 and 2.26% of body weight. The fish grew during the first two experiments (SGR = 2.54 and 3.18%/d, respectively), but lost weight during the 3rd and 4th experiments (SGR = -1.75 and -1.71%/d, respectively).

Suggested Citation

  • I. Šetlíková & Z. Adámek, 2004. "Feeding selectivity and growth of Nile tilapia (Oreochromis niloticus L.) fed on temperate-zone aquatic macrophytes," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 49(6), pages 271-278.
    • Handle: RePEc:caa:jnlcjs:v:49:y:2004:i:6:id:4310-cjas
    DOI: 10.17221/4310-CJAS
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