两种青蟹幼蟹水泥池套放网箱中间培育的比较研究

Comparative studies on the intermediate rearing of the seeds(Scylla paramamosain﹠Scylla serreta) in outdoor pool with the net cages

在水温25～27℃、盐度13～16、pH值7.5～8.5、连续充气的条件下,以PVC管和筛绢网制成的网箱进行拟穴青蟹(Ⅰ组)和锯缘青蟹(Ⅱ组)两种蟹苗的中间培育。结果表明:网箱培育的拟穴青蟹与锯缘青蟹的蜕壳率分别为47.28%和42.72%,彼此差异显著(p<0.05);死亡率分别为32.88%和42.19%,彼此差异显著(p<0.05)。Ⅰ组、Ⅱ组的增肉系数分别为21.10,14.17;甲长增长率分别为337.25%,304.99%;甲宽增长率分别为275.00%,204.42%。Ⅰ组、Ⅱ组的甲长与甲宽的关系分别为yⅠ=1.6455xⅠ-1.8486,yⅡ=1.7406xⅡ-2.7513;甲宽与体质量的关系分别为wⅠ=0.0264eⅠ0.2818x,wⅡ=0.0308e0Ⅱ.2772x;在本实验条件下青蟹密度为417只/m2时的存活率最高。表明水泥池套养网箱的中间培育模式是可行的。

Under the condition of water temperature of 25 - 27℃, pH of 7.5 - 8. 5, salinity of 13 - 16 and continuous aeration, the experiment was conducted on two differem species of juvenile crabs （Scy/la paramamosain, Scylla serrata） with the cages which were made of PVC pipe and silk screen net in pools . The result showed the rates of mortality were Scylla paramanusain （ 42. 19% ） and of Scylla serrata （32. 88% ） ; the molting rates were Scylla paramamosain （42. 72% ） and of Scylla serrata （47. 28% ）. The weight coefficient were the groups Ⅰ （21.10） and the group Ⅱ （ 14. 17） ; the increase of carapace length were the groups Ⅰ （337.25%） and the group Ⅱ （304. 99% ; the increase of carapace width are 275.00%, 204. 42%, had signification difference （p 〈 0. 05 ）. The relationships between the carapace length and width of three groups （Ⅰ, Ⅱ） were y1 = 1. 6455x - 1.8486, yⅡ = 1.7406x - 2. 7513; the relationships between the carapace width and weight of two groups were w Ⅰ = 0. 0264e^0.2818x, w Ⅱ = 0. 0308e^0.2772x. In conclusion , under the condition of this experiment , the density of juvenile crab was 417/ m^2 had the highest rate of survival, the model of cultured, crabs with the cages which were made of PVC pipe and silk screen net in pools is feasible.