SUBSTITUTION EFFECT OF BEET LEAF BY-PRODUCT (BLB) FOR MACROALGAE Saccharina japonica IN DIET ON GROWTH OF JUVENILE ABALONE Haliotis discus

Dietary substitution effect of beet leaf by-product (BLB) f or macroalgae (Saccharina japonica ) on growth  of juvenile abalone (Haliotis discus )  was investigated .  Twenty percent S. japonica was included in the control (Con) diet.  Twenty five, 50, 75 and 100% S. japonica in the Con diet w ere substituted  with BLB , referred to as  the BLB25, BLB50, BLB75 and BLB100 diets, respectively. Finally, the dry S. japonica was prepared to compare the effect of formulated diets on growth performance of abalone. Juvenile abalone  were fed with one of the experimental diets once a day for 16 weeks.  Weight gain and specific growth rate (SGR) of abalone fed the BLB25, BLB50 and BLB75 diets were greater those of abalone fed the Con diet and S. japonica . Weight gain and SGR of abalone fed all formulated diets were greater than those of abalone fed the S. japonica . BLB is a promising alternative source for S. japonica in abalone feed.

Dietary substitution effect of beet leaf by-product (BLB) f or macroalgae (Saccharina japonica ) on growth performance  of juvenile abalone (Haliotis discus )  was investigated .  Twenty percent S. japonica was  included in the  control (Con) diet.  Twenty five, 50, 75 and 100% S. japonica w ere substituted  with equal amount of BLB, referred to as the  BLB25, BLB50, BLB75 and BLB100 diets, respectively. Finally, the dry S. japonica was prepared to compare the effects of formulated diets on abalone. Abalone were fed with one of the experimental diets for 16 weeks.

After the 16-week feeding trail, survival of abalone was not different among the diets (Table 1). However, weight gain and specific growth rate (SGR) of abalone fed the BLB25, BLB50 and BLB75 diets were greater than those of abalone fed the Con diet and S. japonica . All formulated diets achieved superior weight gain and SGR to those of abalone fed the S. japonica . Therefore, beet leaf by-product (BLB) seems to be a promising alternative source for S. japonica in abalone feed.