One, eel seed cultivation

Eel seed cultivation is the process of raising white eels weighing 0.1 to 0.2 to small eels weighing 10 to 20 grams, and in the second year, most of the eel seed can be raised to market as food eels (150 to 200 grams/tail). Eel fry raised into eel seed is generally divided into three levels.

Levels of eel pool stocking specifications and densities are as follows: a pool of 0.1 to 0.2 grams of eel seedling per square meter stocked 0.2 to 0.3 kg; two pools of 0.3 to 2 grams of eel seedling per square meter stocked 0.3 to 1 kg; three pools per square meter stocked with 2-20 grams of eel seed 0.5 to 2 kg.

Selection of eel fry: quality eel fry requires a broad head kiss blunt, neat specifications; swimming lively, body without trauma, body color is polished jade white; skin moist, strong body, no pathogenic parasites. Specification is about 6000 tails per kilogram.

Eel seedling stocking: stocking time for March to April, the water temperature of 20 ℃ above stocking is more appropriate. Before releasing the fry should be cultivated pool and eel fry for drug sterilization. The sterilization method of the cultivation pool is the same as that of the domestic fish fry pool. The stocking density is according to the requirements of the first-class pool.

Feeding training: Feeding training is the key technique for the success or failure of eel farming, and it takes about a month of training. In the first week after the eel seedling is placed in the pond, you should try to make the eel seedling from scattered feeding to centralized feeding. Generally from the evening, the use of earthworms as bait, will be clean earthworms scattered cast on the food table, feeding 4 to 5 times a day, the daily feeding amount of eel seedling of the total body weight of 20 to 40%.

At the same time, hang a 15W electric lamp above the food table to lead the eel fry around the food table and concentrate on feeding. You can also put a canopy over the food table during the day to create a dark environment, which will also induce the eel fry to feed. After one week, if most of the eels are lured to the food table to feed, it shows that the concentrated feeding training has been successful. Then gradually postpone the feeding time backward, and finally completely change to daytime.

From the second week onwards, the amount of earthworms fed should be gradually reduced, and the amount of mussels, pork spleen or minced meat of fresh fish and other fresh feeds should be increased, and the amount of feeding should be 4 times a day, and the amount of feeding should account for 10-15% of the total weight of the eel fry. 15 days later, the amount of earthworms or minced meat mixed with the compound feeds will be fed, and the proportion of the compound feeds will be increased gradually.

After 1 month, all the eel fry with feed, feeding twice a day, daily feeding amount accounted for 5-8% of the total weight of the eel fry. The feed should be kneaded well with water, and the appropriate amount of oil should be added if possible. The feed should be fed immediately after mixing to prevent the alpha-starch from cracking and affecting the adhesion.

Graded feeding: eel fry in the feeding due to inter-individual competition for food ability is not strong and weak, resulting in a large difference in the size of the individual, so every 20 to 30 days will be different sizes of eel fry sub-feeding, sub-feeding should be stopped for a day before.

Because the eel fry is still small, the first few times the eel fry can be used dense eye fishing sea fishing under the food platform, the first on the food platform of the strong fry priority points; later, as the individual grows up, available in Guangdong fish sieve or a different mesh without knots nets for the work of sorting.

After the sorting with dysentery drug bath, you can according to the level of stocking. The stocking specification and density of each level of seedling pond are as mentioned above. The daily feeding amount of eel with feed after sorting is 3-5% of the total weight of the fish body. Eel fry feeding to the middle and late November, most of the individuals can grow to about 20 grams, can be used as eel seed into the adult eel pool culture.

Water quality regulation: Cultivating and managing the water quality of the eel pond is a reliable guarantee of high eel production.

The main measures are:

1. Cultivate microcystic algae to increase the dissolved oxygen in the water. Because the source of dissolved oxygen in the eel pond water depends mainly on the microcysts in the cyanobacteria produced through photosynthesis, therefore, when the number of microcysts in the pond water is small, the transparency is too large, the microcysts should be fished from the nearby ponds, put into the eel pond, and the application of ammonium sulphate, 1.0 ~ 1.5 kg per mu, for 2 ~ 3 days, to strengthen the fertilization, so that it rapidly reproduces and grows.

2, master the water color. Pool water should be kept thick green palladium, transparency to about 25 centimeters is appropriate. When the water color from dense green to light green or light yellow, or transparency greater than 25 cm, should be timely application of ammonium sulfate, 0.5 ~ 1 kg per mu, for 2 days. When the microcystis is too much, the water color is too thick, and the transparency is less than 15 cm, new water should be injected to increase the transparency to about 25 cm.

3, timely removal of insects. Zooplankton is the enemy of microcystis aeruginosa, especially the biggest impact of rotifers, in order to limit the reproduction of rotifers, can be in the eel pool to raise a certain number of bighead carp, generally per mu can be raised 2 age bighead carp 10 ~ 20 tails. If the zooplankton is still reproducing too fast, then crystal trichlorfon can be used to splash, so that the pool water is 0.5 ~ 1ppm concentration.

4, timely water injection. In order to improve the water quality of the eel pool, should also install a waterwheel aerator to increase oxygen, boot time can refer to the part of the domestic fish farming. At the same time, the water should be changed every day 1/10 ~ 1/7, water change, should be the pool water in the residual bait, feces out of the pool.

Extended information:

p>The world's eel products are divided into natural capture products and aquaculture products, foreign macroeconomic and policy environment makes eel farming is the development and protection of the situation, in recent years the world's eel aquaculture production is a growing trend of the total production of basically stabilized at about 230,000t, the main producing areas are concentrated in Asia, followed by Europe, Africa and the Americas.

Eel consumption market is mainly concentrated in Japan, South Korea, China, Hong Kong and Macao, Southeast Asia, Europe, the United States and Canada and other countries and regions, the product is mainly baked eel, live eel and frozen eel, of which baked eel consumption accounted for more than 90% of the total consumption.

China's eel farming (mainly European eel and Japanese eel) is the first in the world, accounting for about 70% of the world's total production, and eel is mainly used for export (mainly exported to Japan and South Korea), with very little domestic consumption. 2007, the country's eel farmed more than 10,000hm?, farmed production of 213.8 million tons, exports of 159.7 million t, and has become the largest eel farming producer and raw material for eel products in the world. It has become the world's largest eel farming producer and raw material supplier of eel products.

China's eel farming is mainly concentrated in Guangdong, Fujian, Jiangsu, Zhejiang and other coastal provinces, has formed a set of eel fry cultivation, adult eel farming, feed production, baked eel and eel and eel by-products processing, export of a one-stop export-oriented industry.

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