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王鸿泰 《淡水渔业》1995,25(6):29-30
鱼虾类暴发性疾病的中医学探讨王鸿泰(中国水产科学研究院长江水产研究所)近年来鱼虾类暴发性流行病越来越严重,呈上升趋势,不少学者都认识到这些流行病与生态环境变化有密切相关,特别是多种细菌和病毒都在同一水环境中,如淡水中的呼肠孤病毒(Reovirus)、...  相似文献
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The relative contribution that solid waste or 'sludge', which accumulates at the bottom of abalone ( Haliotis midae L.) tanks, makes to dissolved ammonia has not been established. Sludge was allowed to accumulate in 10 fully stocked abalone tanks, fed a formulated feed (Abfeed®; Marifeed, South Africa), for 24 days. Sludge was subsequently siphoned from five of these tanks. Total ammonia nitrogen (TAN) production and toxic, free ammonia nitrogen (FAN) were recorded in the tanks from which sludge was removed and compared with those from which sludge was not removed over the subsequent 50 h. Tanks with neither abalone nor sludge present were used as a control. The mean production of TAN (±standard deviation) was an average of 44% higher in tanks from which sludge was not removed compared with those from which it was, indicating that the sludge was a significant contributor to dissolved ammonia in the tanks. The toxic FAN concentrations were correspondingly higher in tanks with sludge present (2.3±0.3 μL−1) compared with cleaned tanks (1.9±0.1 μL−1). Our results indicate that regular removal of sludge from abalone tanks should significantly reduce the dissolved ammonia levels, thereby improving water quality in the culture environment.  相似文献
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