凡纳滨对虾"棚塘接续"养殖的最佳转塘规格与综合效益分析OA

To address the problems of high early-phase risks and unstable returns in the traditional direct-stocking model of Pacific white shrimp(Litopenaeus vannamei),this study optimized the key parameters of the"green-house nursery-pond grow-out"relay culture system and evaluated its comprehensive benefits.The experiment used directly stocked postlarvae(1.0 cm)as the control(CK)and established three nursery-size groups:2.0 cm(S2.0),3.0 cm(S3.0),and 4.0 cm(S4.0).A pond grow-out comparison trial(n=3)was conducted,during which growth performance,feed utilization efficiency,and economic benefits were measured.The results showed that the S3.0 group achieved the highest grow-out survival rate(82.5±3.8)%,which was significantly higher than that of the CK group(65.2±7.1)%and the S2.0 group.The yield per unit area of the S3.0 group was(8 842±348)kg/ha,and its net profit reached(123 760±7 912)CNY/ha,both significantly superior to those of the CK and S2.0 groups.Moreover,its return on investment(73.7±4.7)%was significantly higher than that of the S4.0 group.In conclusion,a nursery size of 3.0 cm is the optimal stocking specification for the"greenhouse-pond re-lay"culture system in this study.This model can significantly improve grow-out survival rates and economic re-turns,demonstrating good potential for widespread application.