坛紫菜与彩虹明樱蛤复合养殖的研究

Study on the polyculture of Porphyra haitanensis and Moerella irredescens

研究了坛紫菜的培育状态、不同氮源及其质量浓度和彩虹明樱蛤与坛紫菜质量比等因素对复合养殖的影响。结果表明,紫菜在苗网上有序分布比自由分散式有更长的生长时间和更高的生长速率。以NO2-N培养的坛紫菜其生长速率最高,4天和7天的生长速率分别达6.13和4.20%/d,高于NH4-N的4.28和2.43%/d及NO3-N的4.72和2.87%/d;不同氮源对培养7天的无机氮变化量和pH值影响较大,其中对第7天的pH值有显著影响(p<0.05)。氮源质量浓度在2.1mg/L水平的坛紫菜生长速率明显高于在1.4mg/L和2.8mg/L水平的坛紫菜生长速率;氮源质量浓度对贝类成活率及培养4天的水体的pH值和DO值影响大,其中对第4天的DO值有显著的影响(p<0.05)。贝藻质量比对坛紫菜生长速率的影响不显著,但对水体的pH值和DO值关系密切,贝类越多,水体的pH值和DO值越低。表明复合养殖中坛紫菜能够促进贝类养殖容量的增加,能够对NO2-N等氮源的吸收利用,从而降低了氨氮对贝类养殖的毒性影响;坛紫菜光合作用吸收了CO2,释放出O2。复合养殖有利于养殖生态系统中O2和CO2保持动态平衡,促进贝藻的生长。

The influence of different cultivating situations,different nitrogen fertilizers and their concentration and fresh weight rate of P. haitanensis and Moerella iridescens on the polyculture of P. haitanensis and Moerella iridescens are studied and the growth rate (SGR) of P. haitanensis,survive rate of the shellfish,pH value and DO rate in the water and the changes of total nitrogen concentration in the cultivating water were observed,and thus the effects of nitrogen fertilizers utilized by P. haitanensis wer...