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3.4 合理确定放养密度 放养密度虽属于饲养管理,严格说来,实质上也是环境问题。过密放养不仅直接影响水体溶氧状况,而且往往会因大量投饵导致残饵偏多,间接影响水体溶氧状况。在环境因子中,溶氧头等重要。溶氧偏低往往诱发链球菌病严重发生。由于红鳍东方鱼屯较耐缺氧,在养殖生产中往往容易忽略过密放养引起溶氧恶化所造成的不利影响。过密放养所引起的不良影响还表现在加剧相残,从而加剧传染性疾病发生、传染、蔓延。 在红鳍东方鱼屯稚鱼过密放养水槽、网箱、池塘,相
3.4 Reasonable stocking density Although the stocking density belongs to feeding and management, strictly speaking, it is essentially an environmental issue. Excessive stocking not only directly affects the status of dissolved oxygen in water bodies, but also often results in a large amount of bait bait, which indirectly affects dissolved oxygen status of water bodies. Among environmental factors, dissolved oxygen is important. Low dissolved oxygen tends to induce severe streptococcal disease. As the redfin eastern fish far more tolerant to oxygen, aquaculture production is often easy to neglect over-density caused by the adverse effects of dissolved oxygen. The adverse effects of over-stocking are also manifested in aggravating the disability, thus aggravating the occurrence of infectious diseases, contagion and spread. In the redfin Oriental fish turtle juvenile stocking tank, cages, ponds, phase