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Titolo:
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
Autore:
Soliman, AK; El-Horbeety, AAA; Essa, MAR; Kosba, MA; Kariony, IA;
Indirizzi:
Univ Alexandria, Fac Agr, Anim & Fish Prod Dept, Alexandria, Egypt Univ Alexandria Alexandria Egypt im & Fish Prod Dept, Alexandria, Egypt Natl Inst Oceanog & Fishery, Alexandria, Egypt Natl Inst Oceanog & Fishery Alexandria Egypt Fishery, Alexandria, Egypt Univ Alexandria, Fac Agr, Poultry Prod Dept, Alexandria, Egypt Univ Alexandria Alexandria Egypt , Poultry Prod Dept, Alexandria, Egypt
Titolo Testata:
AQUACULTURE INTERNATIONAL
fascicolo: 4, volume: 8, anno: 2000,
pagine: 315 - 326
SICI:
0967-6120(2000)8:4<315:EOIDIF>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Keywords:
duck-fish culture; economic analysis; fish yield; nutritional parameters; plankton; water quality;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Soliman, AK Univ Alexandria, Fac Agr, Anim & Fish Prod Dept, Alexandria, Egypt Univ Alexandria Alexandria Egypt od Dept, Alexandria, Egypt
Citazione:
A.K. Soliman et al., "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", AQUACUL INT, 8(4), 2000, pp. 315-326

Abstract

Raising ducks on fish ponds (fish-duck culture) on a commercial scale is anew 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, eachpond was stocked with four species of fish (common carp Cyprinus carpio, silver carp Hypophthalmichthys molitrix, Grey mullet Mugil cephalus and tilapias Oreochromis niloticus and 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, foodconversion 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 oncosts, return on equity, pay-back period and break-even point showed that the integrated system was more profitable than the non-integrated system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 12:18:24