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我国东北、西北、华北省区,年冰封期长达100～140多天,养殖鱼类的越冬是这些地区渔业生产中的重要环节。越冬期间常因冰下水体缺氧,致使鱼类死亡造成损失。为确保鱼类安全越冬,给冰下水体增补氧气是至关重要的。传统的注水补氧、循环水补氧、充气补氧、曝气补氧等方法虽然都有一定的效果,但无论哪种方法,都会由于水与冷空气接触而引起水温下降,对越冬鱼类更加不利,而且耗费人力物力,增加生产成本。大连水产学院研究的保证鱼类安全越冬的冰下生物增氧技术,不仅克服了传统补氧方法中的弊端,而且简单易行。生物增氧,即通过人为措施在越冬池冰下水体中培养适低温和弱光照的浮游植物,利用其光合作用丰富水中溶解氧,以保证鱼类安全越冬。其具体技术介绍如下:
China’s northeast, northwest, north China provinces, the ice period of up to 100 to 140 days, overwintering farmed fish is an important part of fisheries in these areas. Often during the winter due to ice hypoxia water, resulting in loss of fish caused by the loss. In order to ensure the safety of fish overwintering, adding oxygen to ice water is crucial. Although traditional methods such as water replenishment and oxygenation, recirculation water replenishment, inflatable oxygen replenishment and aeration oxygen replenishment have certain effects, no matter which method is used, the water temperature will drop due to the contact between water and cold air, More unfavorable, but also consume manpower and resources, increase production costs. Dalian Institute of Fisheries to ensure the safety of fish wintering ice biological oxygenation technology, not only to overcome the shortcomings of the traditional oxygen method, and simple. Biological oxygenation, that by artificial means in the wintering pool of ice in the cultivation of low temperature and light photos of phytoplankton, the use of its photosynthesis rich water dissolved oxygen, in order to ensure the safety of fish wintering. The specific technical introduction is as follows: