Influence of various diets on growth, body composition and digestive enzyme activities of juvenile white-spotted conger (Conger myriaster)
YANG Hao，SHI Bao*，WANG Chenggang，ZHANG Daiqiang，LI Jing，ZHAO Xinyu，YAN Kewen，CHEN Yan
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1.State Key Laboratory of Mariculture Biobreeding and Sustainable Goods，Key Laboratory of Sustainable Development of Marine Fisheries，Ministry of Agriculture and Rural Affairs，Laboratory for Marine Fisheries Science and Food Production Processes，Laoshan Laboratory，Yellow Sea Fisheries Research Institute，Chinese Academy of Fishery Sciences，Qingdao 266071，China；2.College of Animal Science and Technology，Inner Mongolia University for Nationalities，Tongliao 028000，China；3.Haiyang Yellow Sea Aquatic Product Company Limited，Yantai 265100，China
In order to develop commercial feed for white-spotted conger (Congermyriaster), the white-spotted conger with body weight of (53.98 g±1.23 g)were reared in 600 L buckets in indoor breeding workshop at stocking density of 15 fish and fed commercial feed for Japanese eel (Anguillajaponica) supplemented with 3% of shrimp bran+14% of fishmeal (diet 1), A.japonica commercial feed (diet 2), trash fish Ammodytespersonatus (diet 3), Enedrasfangi (diet 4), and mixture of A.personatus+E.fangi (diet 5) at water temperature of 25.6-27.4 ℃ for 40 days to investigate effects of different diets on the growth performance, feed utilization, body composition and digestive enzyme activities. The results showed that the fish fed diet 1 and diet 2 had significantly low specific growth rate and weight gain rate compared to the fish fed diet 3 and diet 5 (P<0.05). There was significantly higher feed conversion ratio in diet 1 and diet 2 groups than that in diet 3, diet 4, and diet 5 groups (P<0.05), with significantly low apparent digestibility and absorption rate of dry matter, crude protein and crude fat in fish fed diet 1, and diet 2 compared to fish fed diet 3, diet 4 and diet 5 (P<0.05). With the increase in dietary crude fat and total sugar levels, the crude fat and total sugar contents in the fish showed an upward trend, with significantly low crude fat levels in the fish fed diet 1 and diet 2 compared to those in diet 3 and diet 5 groups (P<0.05). The fish total sugar content was shown to be significantly higher in diet 1 and diet 2 groups than in diet 4 and diet 5 groups (P<0.05). There was significantly lower trypsin activity in the stomach, foregut, midgut and hindgut in diet 1 and diet 2 groups than those in diet 4 group (P<0.05), with significantly lower lipase activity in foregut and midgut in the fish fed diet 1 and diet 2 than that in diet 3 and diet 5 groups (P<0.05). The significantly higher amylase activity in stomach, foregut, midgut and hindgut was observed in diet 1 and diet 2 groups than that in diet 3, diet 4 and diet 5 groups (P<0.05). In conclusion, the significantly better growth performance, feed coefficient, feed apparent dry matter, rude protein, and crude lipid digestibility, trypsin activity and lipase activity were observed in the fish fed A.personatus, E.fangi and A.personatus+E.fangi mixed than the fish fed A.japonica commercial feed treatment group and A.japonica commercial feed, with the best feeding effect in A.personatus group. It is recommended to develop an ideal practical feed formulation for C.myriaster based on the nutrient characteristics of A.personatus.
YANG Hao, SHI Bao, WANG Chenggang, ZHANG Daiqiang, LI Jing, ZHAO Xinyu, YAN Kewen, CHEN Yan.
Influence of various diets on growth, body composition and digestive enzyme activities of juvenile white-spotted conger (Conger myriaster)[J]. Journal of Dalian Fisheries University, 2024, 39(3): 420-428 https://doi.org/10.16535/j.cnki.dlhyxb.2024-024
中图分类号：
S 963
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