Effects of dietary spray‐dried porcine plasma (SDPP) on growth, digestive capability and diseases resistance of juvenile hybrid grouper Epinephelus lanceolatu × E. fuscoguttatus
2021
Li, Baoshan | Wang, Jiyiny | Sun, Yongzhi | Wang, Shixin | Huang, Bingshan
Hybrid grouper (E. lanceolatu × E. fuscoguttatus) is a high economic value cultured species in Southeast Asia. There is a dangerous stage during its body length from 7 cm to 15 cm, and rotten fins and enteritis often occur in this period. An 8‐week trial was conducted in RAS to investigate the effect of dietary graded SDPP (0, 10, 20, 30, 40 and 50 g/kg) on growth performance, digestive physiology and disease resistance of juvenile hybrid grouper with initial body weight 10.40 ± 0.15 g. The results showed that both weight gain and specific growth rate were increased firstly and then decreased with the increase in dietary SDPP (p < .05). There were no variations on moisture, crude lipid and crude ash contents in muscle, but crude protein was increased firstly and then kept stable when dietary SDPP higher than 30 g/kg. Both tyrosine and lipase activities were increased by dietary SDPP (p < .05), but there were negative effects on the height and numbers of villus (p < .05). Almost of fish fed with no SDPP were get sick and about two‐thirds were deed 48 h after injection with Vibrio Harveyi, and survival rate was significantly increased by dietary more than 20 g/kg SDPP (p < .05). The results illustrated that dietary 20 g/kg SDPP can improve the growth performance, enhance the antioxidant capacity and supply protection against Vibrio Harveyi of hybrid grouper juveniles.
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