影响鱼类生长的水质因子机理与控制

水产养殖在饲料稳定性差、养殖密度过大、换水不勤时,会导致饲料残渣和排泄物累积,引起水质恶化。水质的好坏主要表现为水的酸碱度值、溶解氧含量、化学耗氧量、透明度、氨氮含量、亚硝酸盐含量以及硫化物浓度等指标的变化。水质恶化极易引起鱼类发病,甚至死亡。笔者对主要水质因子影响鱼类生长的机理和控制途径进行了探讨。

Mechanism and Control of Water Quality Factors Influencing the Growth of Fish

The poor feeds stability, too high stocking density, little water renewal would lead to the accumulation of feed-residue and excretions and induce the deterioration of water quality in aquiculture. The water quality was mainly indicated by the variations of indices including pH value, dissolved oxygen content, chemical oxygen consumption, transparency, ammonia nitrogen content, nitrite content and sulfide concn. of water. The deterioration of water quality would cause fish to infect disease, even to die ver...