稻田中混养不同密度鲫对中华绒螯蟹生长和营养成分的影响

DIFFERENT POLYCULTURE DENSITY OF CARASSIUS AURATUSON ON THE GROWTH AND NUTRIENT COMPONENT OF ERIOCHEIR SINENSIS UNDER RICE-CRAB CULTURE SYSTEM

  • 摘要: 为达到养殖环境生态平衡, 研究了稻田环境中混养鲫(Carassius auratus)(48.53±2.11) g/尾 对中华绒螯蟹(Eriocheir sinensis)(23.48±0.82) g/尾生长和营养成分的影响。实验设置4个鲫密度: 0 (T0, 对照组)、100 (T1)、200 (T2)和300尾/667 m2 (T3), 分别与中华绒螯蟹(300只/667 m2)混养, 实验周期90d。结果显示: T1组中华绒螯蟹的终末体质量、增重率、特定生长率、摄食率、出肉率、肝胰腺指数、性腺指数和总可食率显著高于其他组, 饵料系数显著低于其他3组, T1组鲫的终末体质量、增重率和特定生长率显著高于其他组(P<0.05); T2组中华绒螯蟹肌肉的总氨基酸、必需氨基酸含量和必需氨基酸评分最高, 其中苏氨酸、亮氨酸、苯丙氨酸和赖氨酸含量显著高于其他各组(P<0.05)。研究表明, 在中华绒螯蟹养殖过程中, 混养不同密度鲫对其生长、可食性状和肌肉营养品质存在显著影响, 其中混养100—200尾/667 m2鲫更有利于提高中华绒螯蟹的品质。

     

    Abstract: In order to achieve the ecological balance in the culture environment and elucidate the influence mechanism of mixed culture of Carassius auratus (average weight of (48.53±2.11) g) on the growth and nutritional composition of Eriocheir sinensis (average weight of (23.48±0.82) g) were selected as the research objects in this paper. The density of C. auratus was set at 0 fish/667 m2 (T0, control), 100 fish/667m2 (T1), 200 fish/667 m2 (T2), and 300 fish/667m2 (T3) in mixed culture with E.sinensis. The experimental period lasted for 90d. The results showed that the final body weight, weight gain rate, specific growth rate, meat yield, hepatopancreas index, gonadal index, and total edible rate were highest in the T1 in 4 experimental groups, while the feed conversion ratio was significantly lower than that in the other groups (P<0.05). The total amino acid content, essential amino acid content, and essential amino acid score in T2 muscle were the highest, with Thr, Leu, Phe, and Lys levels in T2 muscle significantly exceeding those in other groups (P<0.05). Research demonstrated that a stocking density of 100-200 fish/667m2 of C. auratus not only enhanced the growth of E. sinensis but also optimized the edible tissues and nutrient quality of E. sinensis muscle.

     

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