Data/hora: 06/06/2024 07:25:54

Provedor de dados: | 5
País: | France
Título: | Economic values of growth and feed efficiency for fish farming in recirculating aquaculture system with density and nitrogen output limitations: a case study with African catfish (Clarias gariepinus)
Autores: | Besson, M.; Komen, H.; Aubin, J.; De Boer, I. J. M.; Poelman, M.; Quillet, Edwige; Vancoillie, C.; Vandeputte, Marc; Van Arendonk, J A M.
Data: | 2014-12
Ano: | 2014
Palavras-chave: | Economic values; Feed conversion ratio; Fish farming; Recirculating aquaculture system; Selective breeding; Thermal growth coefficient.
Resumo: | In fish farming, economic values (EV) of breeding goal traits are lacking, even though they are key parameters when defining selection objectives. The aim of this study was to develop a bioeconomic model to estimate EV of 2 traits representing production performances in fish farming: the thermal growth coefficient (TGC) and the feed conversion ratio (FCR). This approach was applied to a farm producing African catfish (Clarias gariepinus) in a recirculating aquaculture system (RAS). In the RAS, 2 factors could limit production level: the nitrogen treatment capacity of the biofilter or the fish density in rearing tanks at harvest. Profit calculation includes revenue from fish sales, cost of juveniles, cost of feed, cost of waste water treatment, and fixed costs. In the reference scenario, profit was modeled to zero. EV were calculated as the difference in profit per kilogram of fish between the current population mean for both traits (mu(t)) and the next generation of selective breeding (mu(t) + Delta(t)) for either TGC or FCR. EV of TGC and FCR were calculated for three generations of hypothetical selection on either TGC or FCR (respectively 6.8% and 7.6% improvement per generation). The results show that changes in TGC and FCR can affect both the number of fish that can be stocked (number of batches per year and number of fish per batch) and the factor limiting production. The EV of TGC and FCR vary and depend on the limiting factors. When dissolved NH3-N is the limiting factor for both mu(t) and mu(t) + Delta(t), increasing TGC decreases the number of fish that can be stocked but increases the number of batches that can be grown. As a result, profit remains constant and EVTGC is zero. Increasing FCR, however, increases the number of fish stocked and the ratio of fish produced per kilogram of feed consumed ("economic efficiency"). The EVFCR is 0.14 (sic)/kg of fish, and profit per kilogram of fish increases by about 10%. When density is the limiting factor for both mu(t) and mu(t) + Delta(t), the number of fish stocked per batch is fixed; therefore, extra profit is obtained by increasing either TGC, which increases the annual number of batches, or by decreasing FCR, which decreases annual feed consumption. EVTGC is 0.03 (sic)/kg of fish and EVFCR is 0.05-0.06 (sic)/kg of fish. These results emphasize the importance of calculating economic values in the right context to develop efficient future breeding programs in aquaculture.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00245/35593/34277.pdf

DOI:10.2527/jas2014-8266

http://archimer.ifremer.fr/doc/00245/35593/

Editor: | Amer Soc Animal Science
Formato: | application/pdf
Fonte: | Journal Of Animal Science (0021-8812) (Amer Soc Animal Science), 2014-12 , Vol. 92 , N. 12 , P. 5394-5405

Fonte:

2014 American Society of Animal Science. All rights reserved.

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