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Titolo:
A partial economic analysis for Nile tilapia Oreochromis niloticus L. and sharptoothed catfish Clarias gariepinus (Burchell 1822) polyculture in central Kenya
Autore:
Omondi, JG; Gichuri, WM; Veverica, K;
Indirizzi:
Univ Nairobi, Dept Zool, ARDU, Nairobi, Kenya Univ Nairobi Nairobi Kenya niv Nairobi, Dept Zool, ARDU, Nairobi, Kenya Sagana Fish Farm, Dept Fisheries, Sagana, Kenya Sagana Fish Farm Sagana Kenya Fish Farm, Dept Fisheries, Sagana, Kenya
Titolo Testata:
AQUACULTURE RESEARCH
fascicolo: 9, volume: 32, anno: 2001,
pagine: 693 - 700
SICI:
1355-557X(200109)32:9<693:APEAFN>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Keywords:
Oreochromis niloticus; Clarias gariepinus; Nile tilapia; sharptoothed catfish; polyculture; partial economic analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Omondi, JG Univ Nairobi, Dept Zool, ARDU, Nairobi, Kenya Univ Nairobi Nairobi Kenya , Dept Zool, ARDU, Nairobi, Kenya
Citazione:
J.G. Omondi et al., "A partial economic analysis for Nile tilapia Oreochromis niloticus L. and sharptoothed catfish Clarias gariepinus (Burchell 1822) polyculture in central Kenya", AQUAC RES, 32(9), 2001, pp. 693-700

Abstract

Aquaculture development in Kenya has been hampered by lack of targeted feeds. Chemical fertilizers can enhance natural food production and thus indirectly provide protein to complement energy-rich cereal brans used as feed. Consequently, an experiment was conducted at Sagana Fish Farm in central Kenya to realize least-cost combinations of rice bran and fertilizer. Twelve 800 m(2) (0.08 ha) ponds were stocked with juvenile (32 g) Oreochromis niloticus L. at 2 m(-2) and Clarias gariepinus (Burchell 1822) (fingerlings of 4.6 g) at 0.2 m(-2). Four treatments, calculated to approximate isonitrogenous conditions, were applied in triplicate as follows: (1) urea and diammonium phosphate (DAP) to provide 16 kg of N ha(-1) weel(-1) and 4 kg of P ha(-1) week(-1); (2) urea and DAP applied to give 8 kg of N ha(-1) week(-1) and 2 kg: of P ha(-1) week(-1), plus rice bran fed at 60 kg ha(-1) day(-1); (3) rice bran fed at 120 kg ha(-1) day(-1); (4) rice bran as in treatment 3 and fertilizer as in treatment 2. Ponds were sampled monthly to measure fish growth, and drained completely after 20 weeks. A partial economic analysis indicated minimal net profits of K. Sh. 18 851 (US$ 251), K.Sh. 9895 (US$132), K.Sh. 3299 (US$ 44) and K.Sh. 7015 (US$ 94) for treatments 1-4, respectively, because of high feed and seed costs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 13:07:27