After the 35-day feeding trial, the final body weight of shrimp was
4.25 ± 0.29 g. No significant difference in growth was detected among
all treatments. Meanwhile, no dead shrimp was found during the feeding
trail.
Seven days after the WSSV challenging, however, all shrimps in the
control group died (Fig. 1). The cumulative mortality of shrimps fed
with 0.2% of dietary β-glucan was significantly lower than those fed
with 0.1% of dietary β-glucan (p b 0.05). However, shrimps fed with
0.1% of dietary β-glucan derivatives showed lower mortality than
those fed with 0.2% of derivatives. Besides dietary contents,DS of the derivatives
also significantly influenced the mortality of shrimps (p
b 0.05). For shrimps fed with 0.1% of dietary CMGs, the mortality increased
with the increasing of DS. Similar trend was found in the
shrimps fed with 0.2% of dietary SEGs. The shrimps fed with 0.1% of dietary
CMGA showed the lowest cumulative mortality among all groups
(6.25 ± 3.61%).