Effects of Different Dietary Carbohydrate Sources on Growth Performance, Body Composition and Digestive Enzyme Activities of Juvenile Green Crab Scylla paramamosain
1.Key Laboratory of Marine Biotechnology of Guangxi, Guangxi Zhuang Autonomous Region Institute of Oceanology, Beihai 536000 China; 2.College of Marine and Biotechnology, Guangxi University for Nationalities, Nanning 530006, China
Abstract：Juvenile green crab Scylla paramamosain with average body weight of (0.012±0.000) g were reared in plastic buckets (20 cm in diameter and 20 cm in depth) with 1—2 cm fine sand and 5 cm2 tiles at bottom and fed diets containing seven carbohydrate (CBH) sources (glucose, sucrose, dextrin, tapioca starch, corn starch, gelatinized tapioca starch, and gelatinized corn starch) for 3 weeks to investigate the effects of dietary CBH sources on growth performance, body composition and digestive enzyme activities of green crab. The results showed that the growth performance of the juvenile was significantly influenced by different CBH sources (P<0.05), the maximal weight gain rate (WGR) and specific growth rate (SGR) in the green crab fed gelatinized tapioca starch, significantly higher than those in other groups (P<0.05) and with the descending order of WGR and SGR as: gelatinized cassava starch > gelatinized corn starch > cassava starch > corn starch > dextrin > sucrose > glucose. The minimal survival ratio (SR) was observed in glucose group, significantly lower than that in the other groups (P<0.05). The body composition analysis indicated that dietary CBH sources had significant effects on body ether extract content and body protein contents (P<0.05), without significant differences in moisture, and ash content (P>0.05). There were significant effects of different dietary CBH sources on digestive enzyme activities in the green crab juveniles (P<0.05), indicating that green crab had higher bioavailability of macromolecule carbohydrate sources than that of micromolecule CBH sources. It is concluded that gelatinized cassava starch is the optimal carbohydrate sources for green crab juveniles.
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2020, Vol. 39 
