Eel, also known as eel, sea eel, white eel, river eel, etc., is a kind of scale-less edible fish, shaped like a snake, let's look at life. The meat of eel is very tender. With make-up, blood, prevention of eel osteoporosis beauty effect, also known as "cosmetics", by many short and fat people cherish, fast growth, high yield, with extremely important prospect advantage. Attracted many aquaculturists, what are your water quality requirements for eel farming.
Water temperature: changes in water temperature directly affect the metabolism of fish. Warm water fish, fast growing period, water temperature 11 to 33 ℃, optimal 25 to 28 ℃, China's Guangdong, Fujian, Taiwan is the best area for eel farming. Acidity and alkalinity (pH): Most of the water referenced in eel farming is extracted from natural bodies of water that are acidic or alkaline for geographic sustainability. The water is also alkaline and more productive than acid. The optimal range is 7.2 to 8.0.
Soluble Oxygen Content: The maximum soluble oxygen content is directly related to the water soluble oxygen content (i.e., saturation.). Water temperature is lower, soluble oxygen storage is larger; there is a large amount of phytoplankton in the water, strong photosynthesis or air fluid on the surface of the water, and the water-soluble oxygen content also increases. Eel is 5-12mg/L. Generally, groundwater lacks soluble oxygen and must pass through the air before it can be used. Calcium, silicate: less calcium ions in water, more silicate ions, high fish mortality, silicate to calcium ratio of 1:3.5, harmless to fish, calcium, silicate content is more favorable.
Methane gas and hydrogen sulfide: both gases are produced when the water is anoxic and composed of large amounts of organic matter. These gases are toxic and very dangerous to the 00 water of the LES, which must contain less than 0.1 g/m3 of methane gas and hydrogen sulfide.Ammonia: Surface water contains high levels of ammonia. According to Ellis (1944), A Pressy, L Pressy, and according to Biockway (1950), for every 1 g/m3 increase in ammonia in water, there is a 1/7 decrease in oxygen in the blood.For the use of groundwater and surface water it is important to be aware of the research, preferably in cooperation with the airlines, and to reuse it.
Iron: Surface water is generally low in iron. Groundwater is usually rich in iron, in the form of ferrous ions, which, when in contact with air, act on unstable pre-iron precipitates, which not only consume a form of oxygen but are unsuitable for mice.a 1 g/m3 and also less than 0.05 g/m3.