论文部分内容阅读
3、虾塘中水质 虾塘放入虾苗并开始投饵后,水质将变化。水质的变化情况将随放养密度、水源、投饵率、换水和虾场管理水平的不同而不同。下面是对拉瑙区两种不同对虾放养密度(25尾/m~2和64尾/m~2)的虾池水质的调查情况,调查时间为1992年10月14日到12月15日: 1)溶氧 溶氧不仅用于对虾的呼吸而且能使池水和底泥中的有饥质进行细菌分解。如溶氧量低于3.8mg/l,虾不愿吃食。理想的溶氧浓度为3.8—5.0mg/l。如溶氧只有2.5—2.8mg/l,虾将在池塘水面活动且生长慢直感染疾病。如溶氧低于0.7mg/l,虾将死亡。氧在水中的溶解度取决于气压、温度和盐度,但溶氧量很大程度上取决于生物学因素如塘中有机物承载量和浮游值物量。在5个月的养殖周期中,一个面积为6涞、放养密度为25尾/m~2并配置增氧设施的虾塘
3, shrimp pond water shrimp pond into the shrimp and began feeding, the water quality will change. Changes in water quality will vary depending on stocking density, water availability, feed rate, water change and shrimp farm management. The following is a survey of the shrimp pond water quality of two different shrimp stocking densities (25 fish / m 2 and 64 fish / m 2) in Ranau district from October 14 to December 15, 1992: 1) Dissolved oxygen dissolved oxygen not only for the shrimp’s breathing but also to make the pond water and sediment of bacteria in the decomposition of bacteria. Such as dissolved oxygen is less than 3.8mg / l, shrimp unwilling to eat. The ideal dissolved oxygen concentration is 3.8-5.0mg / l. If the dissolved oxygen is only 2.5-2.8mg / l, shrimp will be active in the pond water surface and slowly grow the disease. If dissolved oxygen is less than 0.7mg / l, shrimp will die. The solubility of oxygen in water depends on air pressure, temperature and salinity, but the amount of dissolved oxygen depends to a large extent on biological factors such as organic matter loading in the pond and amount of float. During the five-month breeding cycle, an area of 6 涞, stocking density of 25 fish / m ~ 2 and equipped with oxygen facilities in the shrimp pond