水草密度对中华小长臂虾养殖池塘水质和生长的影响

为探索养殖池塘水草覆盖面积对养殖水质和对中华小长臂虾生长性能的影响,设伊乐藻密度为10％、30％、50％(A、B、C)3组试验,每666.7m2放养平均尾重0.01 g的虾苗50万尾.每5天测定一次水化指标,试验结束后测量虾的生长指标及饲料系数.结果 表明,水温在20天后A＞B＞C;溶氧在15天后B＞A,C组在25～4...

Effects of Waterweed Density on Water Quality and Growth of Palaemonetes Sinensis in Ponds

In order to explore the influence of waterweed coverage area on aquaculture water quality and growth performance of Palaemonetes sinensis in ponds, in the experiment, three groups of 10%, 30% and 50% (A, B and C) waterweed densities were set up, and 500 thousand shrimp larvae with average weight of 0.01 g were cultured per 666.7 m ² in pond. The hydration index was measured once every 5 days, and the growth index and feed coefficient of shrimp were measured after the experiment. The results showed that: the water temperature was A>B>C after 20 days. The dissolved oxygen of B was higher than that of A after 15 days. The dissolved oxygen of C was higher than that of A and B in 25-45 days, and lower than A and B in 50-85 days, in the two periods, the dissolved oxygen of C was significantly different from A and B (P<0.01). From 35 to 85 days, the pH was C>B>A, and the difference was extremely significant among the three groups (P<0.01). In 15~25 days, ammonia nitrogen was A>B>C, while C>A>B was found in 40~85 days, and the difference was extremely significant (P<0.01) among the three groups. The nitrate nitrogen was A>B>C in 25~45 days, and C>A>B in 50~85 days, and the difference among the three groups was extremely significant (P<0.01). The growth index and unit yield were B>A>C. The feed coefficient was C>A>B, and there was a significant difference (P<0.05) between B and C. Based on the water quality indexes, the growth performance and the feed utilization, waterweed density of 30% area (B) is better than the other two groups under the experimental conditions.