鲍藻混养配比密度的研究

为探索杂交鲍与海藻混养的合适密度比例,分2部分进行试验。第一部分将不同密度的石莼和真江蓠分别在水产养殖废水中养殖24h,观察24h内水体中NH＋4-N,NO-2-N,NO-3-N,PO3-4-P的浓度变化。结果显示：2种海藻都能有效地吸收4种营养盐,且随着海藻密度的增加,吸收效果也加强;第二部分试验,将不同密度的杂交鲍分别与密度为3g·L-1的石莼和6g·L-1的真江蓠进行混养。结果显示：随着杂交鲍密度的增加,杂交鲍的生长率有所下降。当杂交鲍混养密度为400粒·池-1时,杂交鲍的生长率相较密度为200粒·池-1时差异不显著,而与杂交鲍密度为600粒·池-1时差异显著。结果还表明,同等密度的杂交鲍,与石莼混养的养殖效果优于真江蓠。

Density and Composition of the Polyculture of Abalone(H.Discus)and Two Kinds of Alga (U.Lactuca and G.Asiatica)

To get the appropriate composition of proportion for the polyculture of H. discus and seaweed, this study can be divided into two parts. First, different density of seaweeds （U. lactuca and Gasiatica ） were set to grow in effluent from aquaculture for 24 hour, of which the content changing of NH＋-N, NO2^--N, NO3^-N, PO4^3--P were tested. The result showed that the purification effect was upregulated with the increase of the density. Because too much seaweed would hinder the abalone＇s growth, we chose the suitable density of 3g·L-1 and 6 g·L-1 for U. lactuca and G asiatica. Second, we set different density of H. discus for polyculture with 3 g·L-1 of U. lactuca and 6 g·L-1 of Gasiatica, respectively, and discovered that with the increase of H. discus density, its growth speed went down respectivly. The growth speed of H. discus of the 400 per pond group showed no significant difference with that of the 200 per pond group, group, thus we regarded the density of 400 per pond as showed that when the density of H. discus was constant, asiatica, and higher growth speed of H. discus as well. but significantly different with which of the 600 per pond the appropriate one for H. discus. And the result also U. lactuca could provide better purification effect then G asiatica, and higher growth speed of H. discus as well.