Growth and feeding responses of the mutton snapper, Lutjanus analis (Cuvier 1828), fed on diets with soy protein concentrate in replacement of Anchovy fish meal

• Autor(a) principal: Freitas, Luiz Eduardo Lima
• Data de Publicação: 2011
• Outros Autores: Nunes, Alberto Jorge Pinto, Sá, Marcelo Vinicius do Carmo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/70489
• topic: Species - Lutjanus analis; Meal; Soy protein; Espécie- Lutjanus analis; Alimentação; Proteína da soja

feeding responses (second phase) of juvenile mutton snapper fed four isonitrogenous and isoenergetic diets with increasing levels of soy protein concentrate (SPC) in substitution to ¢sh meal (FM). The FM was replaced by SPC at 0% (basal diet, SPC000), 33% (SPC130), 57% (SPC214) and 77% (SPC300). After 95 days of rearing, ¢sh fed SPC300 attained a signi¢- cantly lower body weight (54.9 13.2 g) compared with those fed diets SPC000, SPC130 and SPC214 (76.5 14.0 g, 73.9 13.8 g and 70.5 14.0 g respectively). Fish yield increased signi¢cantly from 891 36 g m 3 for ¢sh fed SPC300 to an average of 1099 111g m 3 for other diets. A maximum ¢sh body weight gain of 0.60 0.05 g day 1 and a maximum speci¢c growth rate of 1.47 0.07% day 1 were achieved for SPC000. Behavioural assays conducted during10 days revealed the loss in ¢sh growth with diets containing higher levels of SPC was due to a decline in feed intake. Low feed intake driven by a poor feed palatability appeared to have been a major obstacle against higher inputs of SPC in diets for mutton snapper.