Aquaculture International

, Volume 8, Issue 4, pp 315–326 | Cite as

Effects of introducing ducks into fish ponds on water quality, natural productivity and fish production together with the economic evaluation of the integrated and non-integrated systems

  • Adel K. Soliman
  • Abdou A.A. El-Horbeety
  • Mohamed A.R. Essa
  • Mohamed A. Kosba
  • Ibrahim A. Kariony
Article

Abstract

Raising ducks on fish ponds (fish-duck culture) on a commercial scale is a new practice in Egypt, therefore, a study was undertaken to evaluate this practice from production, carcass composition and economic viewpoints.

Five earthern ponds were used in the non-integrated system (no ducks) whereas four earthen ponds, in which each pond was supplied with 125 Pecking ducks per 0.42 ha, were used for the Integrated system. In both systems, each pond was stocked with four species of fish (common carp Cyprinus carpio, silver carp Hypophthalmichthys molitrix, Grey mullet Mugil cephalus and tilapias Oreochromis niloticusand O. aureus) at the same densities.

There were no differences in temperature or pH in any of the ponds but dissolved oxygen levels were lower in integrated ponds concomitant with increasing levels of ammonia, phosphate and nitrate. Water in integrated ponds was richer in natural productivity (phytoplankton and zooplankton) either in species or density when compared with those variables in non-integrated ponds.

Fish species reared in integrated ponds exhibited better body weight, food conversion and protein efficiency ratios compared with those of fish species in the non-integrated ponds. Fish yield per 0.42 ha produced from the integrated ponds was significantly higher than that obtained from non-integrated ones. Also, body composition of fish species was affected by the type of farming. Carcass crude protein of grey mullet, silver carp and tilapia was improved in the integrated system. The data on return on sales, return on costs, return on equity, pay-back period and break-even point showed that the integrated system was more profitable than the non-integrated system.

duck-fish culture economic analysis fish yield nutritional parameters plankton water quality 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Adel K. Soliman
    • 1
  • Abdou A.A. El-Horbeety
    • 2
  • Mohamed A.R. Essa
    • 2
  • Mohamed A. Kosba
    • 3
  • Ibrahim A. Kariony
    • 2
  1. 1.Animal and Fish Porduction Department, Faculty of AgricultureAlexandria UniversityEgypt (author for correspondence, fax:
  2. 2.National Institute of Oceanography and FisheryAlexandriaEgypt
  3. 3.Poultry Production Department, Faculty of AgricultureAlexandria UniversityEgypt

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