The use of a soy product in juvenile yellowtail kingfish (Seriola lalandi) feeds at different water temperatures: 1. solvent extracted soybean meal
Bowyer, JN and Qin, JG and Smullen, RP and Adams, LR and Thomson, MJS and Stone, DAJ, The use of a soy product in juvenile yellowtail kingfish (Seriola lalandi) feeds at different water temperatures: 1. solvent extracted soybean meal, Aquaculture, 384-387 pp. 35-45. ISSN 0044-8486 (2012) [Refereed Article]
Juvenile yellowtail kingfish (Seriola lalandi) were fed four iso-nitrogenous and iso-calorific (digestible basis) experimental
diets containing 0, 10, 20 or 30% solvent extracted soybean meal (SESBM) for 34 days at optimal
(22 °C) and suboptimal (18 °C) water temperatures to determine the effects of diet and water temperature
on growth, feed efficiency, nutrient retention, apparent nutrient digestibility and digestive functions. The
substitution of fish meal up to 20% SESBM did not significantly affect the growth of fish. No differences were
detected in any of the other parameters measured between 0 and 10% inclusion. However, second-order
polynomial regression demonstrated that increasing SESBM had a negative effect on growth performance,
feed efficiency, nutrient retention and the apparent nutrient and energy digestibility of diets for yellowtail kingfish.
Whole body moisture, crude lipid, ash and gross energy were affected by SESBM in the diet, except protein.
The apparent nutrient and energy digestibilities all decreased linearly with increasing SESBM. Digestive enzyme
activities in the pyloric caeca were not affected by diet, whereas activities in the foregut and hindgut varied with
SESBM inclusion. Fish held at 18 °C had significantly reduced growth, feed efficiency and nutrient retention
values. The whole body moisture increased at 18 °C, while the apparent nutrient and energy digestibilities
and whole body protein and gross energy content were lower at 18 °C and there was no effect of temperature
on whole body total fat or ash content. The impact of temperature on digestive enzyme activities depended on
the section of the digestive tract. This study demonstrates that 10% inclusion of SESBM (21.7% fish meal
substitution) can be used as a substitute for fish meal in diets for yellowtail kingfish.
plant proteins, digestibility, digestive enzymes, fish meal replacement, suboptimal temperature