Apparent digestibility coefficients of feedstuffs in seabass (Dicentrarchus labrax) juveniles

Departamento de Zoologia e Antropologia e Centro de Investigação Marinha e Ambiental, Faculdade de Ciências do Porto, 4050 Porto, Portugal

Received: 12 May 1997
Accepted: 13 May 1998

Abstract

A number of feedstuffs was tested to obtain the apparent digestibility coefficients (ADC) of dry matter, protein, energy and phosphorus for seabass juveniles (individual mean weight of 40 g). The effect of the inclusion level (15 and 30 %) of a feedstuff in a reference diet on the ADC was also evaluated. The feedstuffs tested in this trial were two fish meals, a fish protein hydrolysate, blood meal, meat meal, soybean meal and yellow dextrin. The ADC of dry matter were consistently lower than those of energy, but there was a significant positive correlation between them. The ADC of protein were high (range 89−97 %) in all feedstuffs. The ADC of energy of animal feedstuffs (range 86−96 %) and dextrin (93 %) were also high, while that of soybean was lower (70 %). The ADC of phosphorus of animal feedstuffs averaged 81 % whereas that of soybean was only 38 %. There were no significant differences in the ADC of protein and energy of each feedstuff at the two inclusion levels tested.