1.Lixiahe District Agricultural Institute of Jiangsu，Yangzhou 225007，China；2.Ecological Agricultural Engineering Technology Research Center of Jiangsu，Yangzhou 225009，China
Abstract: In order to clarify influence mechanism of aquatic plant environment on growth and development of red swamp crayfish (Procambarusclarkii), juvenile red swamp crayfish with body weight of (3.54±0.73)g were reared in a 2.5 m length×2.0 m wide×1.2 m high canvas box with 0.3 m depth of soil at bottom for planting aquatic plants Hydrillaverticillata (group HM), Alternantheraphiloxeroides (group AM)and bionic plastic aquatic plant (control group, BM) at coverage rate of 50% at initial density of 30 crayfish per box at water temperature of (23.51±2.92)℃ for 62 d. Breeding period, the culture boxes were aerated for oxygenation at night and on rainy days. The results showed that there was significantly higher dressing rate in the crayfish in group HM than that in the BM group (P<0.05). The crayfish had higher survival rate and total weight in groups HM and AM than those in the control group did, increased by 12.12%, 11.42% and 16.68%, 25.78%, respectively. The activities of trypsin and cellulose in hepatopancreas were shown to be significantly higher in groups HM and AM than those in group BM (P<0.05), and significantly lower activities of trypsin and cellulase in intestine in groups HM and AM than those in group BM (P<0.05), without significant difference in amino acid content among all groups (P<0.05). ∑(n-3) polyunsaturated fatty acid (PUFA)/∑(n-6)PUFA of muscle was significantly higher in HM and AM groups than that in group BM (P<0.05). The contents of EPA, DHA, ∑SFA and ∑PUFA were found to be significantly higher in the muscle in group HM than those in group BM (P<0.05). The findings indicate that the aquatic vegetation environment has a significant impact on the growth performance, physiological indicators, and muscle nutrient quality of red swamp crayfish during cultivation. Planting H.verticillata is more conducive to improving the muscle quality of crayfish.
2023, Vol. 38 
