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Optimum levels of replacement of fish meal with soybean meal in practical diets for growing and fattening of gilthead bream (Spars aurata) (Abstract)
Millan, L.M.; Ortega, A.; Posada, J.R. (1989). Optimum levels of replacement of fish meal with soybean meal in practical diets for growing and fattening of gilthead bream (Spars aurata) (Abstract), in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 683
In: De Pauw, N. et al. (Ed.) (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene, Belgium. ISBN 90-71625-03-6. 1-592 pp., more

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Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Millan, L.M.
  • Ortega, A.
  • Posada, J.R.

Abstract
    Several trials sponsored by the American Soybean Association were carried out in cooperation with the Spanish Institute of Oceanography (Mar Menor-Murcia) and ATP SA, aiming to determine commercial diets with optimum levels of soybean meal (48%). The partial replacement of fish meal with soybean meal, amounting to 35, 55, and 75% of total crude protein in the diet with regard to the control diet (all fish meal 70%), was evaluated in different vital growth stages. The diets were adjusted -isonitrogenous base -at 40% of protein, and with a digestible energy of 3500 Kcal.kg-1. The results are as follows: in fingerlings weighing 2g, the acceptance of all diets was total, without feeding or pathological problems occurring. Only the 75% diet showed a lower growth. The conversion index ranged between 1.3 and 1.4 and the feed intake between 4 and 6% of live weight. Temperatures varied between 22 and 29°C. Adults with an initial weight of 75g were used in another trial, which also gave satisfactory results. The best diet was that with 55% replacement, even better than the control diet, with conversion index ranging between 27 and 2.9 and intake rates between 3.2 and 3.5% live weight. The general conclusions suggest the possibility of replacing substantial amounts of fish meal with soybean meal in the diets for growing and fattening gilthead bream (Sparus aurata) as has been done in feeds for trout, carp, catfish, etc.

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