At present, artificial eel breeding mainly buys wild eel species from the market. If you want to raise eels successfully,
At present, artificial eel breeding mainly buys wild eel species from the market. If you want to raise eels successfully, you must pass the selection of eel species. When you buy eel varieties from the market, you must choose them strictly. It is best to buy eel species caught in cages and temporarily raised for less than 2 days from fishermen, while eel species caught by hook, electric eel and eel clip can not be used as eel species generally, but they can also be artificially cultured through careful screening and treatment.
(1) The species selection of Anguilla japonica is among the natural population of Anguilla japonica, and the dark yellow spotted Anguilla japonica and light yellow spotted Anguilla japonica are the most suitable for professional breeding, while the bluish gray Anguilla japonica is only suitable for rural family fish farming and is comprehensively utilized as a polyculture species. There are also light white eels, light black eels and so on. This kind of eel is small in number and does not grow fast, so it is not suitable for aquaculture.
(two) the selection of eel species specifications must be neat, strong, bright, harmless and lively. It is best to choose local eel varieties for breeding and release them 1 time. It is more economical to choose smaller eel species, generally l5 per tail. Twenty grams. With the delay of time, it is necessary to increase the number of selected seeds in order to obtain higher breeding benefits in that year.
(3) Systematic screening method of eel varieties The above screening of eel varieties and specifications objectively reflects the quality of eel varieties, and there are still many uncertain factors in actual breeding, such as storage, transportation and injury. So, you have to go through the following l? Two methods are used for screening.
Length sensory screening method: screening according to your own feelings and experience. Eel species are healthy and lively, and can raise their heads and struggle with their hands. Observe whether there is mucosal shedding and abnormal spots. If the body is twisted, red, the anus is red and swollen, and the tail is twisted, good quality eels generally move freely under the bottom of the pool. Good quality eels are the ones with clear water in the observation pond.
2. Current screening method: eels like to swim against the current. It is normal that the water in the eel pond is stirred spirally in a certain direction with appropriate strength, and the eels swim in the opposite direction (top water). If you follow the water, you might as well not swim.
3. Flapping screening method: In view of the fact that wild eels are usually not disturbed, good quality eels are put in shallow pots during screening, and those that can't jump or not jump are inferior eels. But injured and parasitic eels will also jump out and should be carefully identified.
4. Behavior screening method: screening according to the aggregation of eels. Observed from the shallow pool, the eels with good quality drill into the four corners in groups, while those with poor vitality are inferior when swimming alone. In order to have observation space, the density should be less than 5 kg/m2.
5. Screening method of drilling grass or holes: put the eel in the pond for about 2 hours. The quality of not digging holes or mowing grass is poor, and some drills fail to drill the tail or will come out again. But some eels with poor quality can also drill holes.
6. Feeding screening method: Feed 2% of the total weight of eels with compound feed, or 3% of Tenebrio molitor or 5% of earthworms. When the temperature is greater than 20 degrees Celsius, if more than half of the feed can be eaten within 2 hours, the eel is of good quality.
7. Drug soaking screening method: effective concentration, time and temperature must be mastered when soaking drugs. Salt water method is preferred. Salt water is very irritating, so be careful when choosing it. If it is not good, it will kill eels. This method can sterilize at the same time, but it will accelerate the death of inferior eels. When screening, don't put all the eels in salt water. Select by sampling. First, grab the eel by hand and put it in salt water. Eel with a concentration of 1%? 2%, eel 3%, soaked for about 5? Ten minutes. During the soaking process, good quality eels will become nervous and quiet, or exercise regularly. However, if the poor quality eels are stimulated with salt water, the sick eels will jump wildly and their tails will become twisted and ugly. After being put into the fish pond, the eel with good quality enters the fish nest. Secondly, soak in 8×10-6 (negative 6th power of lo) sulfuric acid ketone 5? LO minutes, can make the mucosa of inferior eel fall off.
The survival rate and yield of eel varieties screened by the above method can be greatly improved. Of course, to master the living habits of eels, the construction of eel ponds, daily management, pest control, heatstroke prevention and cooling, and ecological farming are all important technical measures for the success of eel breeding.