uggs outlet rotterdam Preliminary Study eel pond _

px477801

Preliminary Study eel pond Wang Xiangyang

Mesh surface covered by black shade, the feed to ensure adequate amounts of vitamin C, vitamin E 'to resist ultraviolet rays and light, heat and other stress factors. The eel is a fish without scales, the body surface mucus of their survival and healthy growth is important, we in the transport, investment and seedlings are very careful when using drugs. 1.7 appropriate disease prevention and maintaining water transparency. In order to avoid eels generate stress response, when temperatures were lower before the 2d of chlorine dioxide using 0.3m3 spilled inside the cage, the effect is very obvious. Eel one box is stable, we also change according to temperature and weather conditions, timely insecticide, insecticidal. 2 Results and analysis 2.1 2.1.1 outputs of intensive pond production of various types of adult fish 13100kg, of which 5,350 grass carp, silver carp and 6000kg, 800 bighead carp, black carp, 130, bream 200kg, 520 high-back crucian carp, catfish 1001 ��g. 42,320 yuan sales revenue, production costs 29,[link widoczny dla zalogowanych],750 yuan (including contractor costs), net income of 12,570 yuan, the average net income of 7856 yuan / hm2. 2.1.2 cages were placed 720 species of eel, eel fishing from 2540kg, income 81,320 yuan, 47,120 yuan production inputs, net profit of 34,200 yuan, 684 yuan net income of a single box, folding 45.6 yuan / n1z. 2.2 chamber 2.2.1 eel output in table 2. 2.2.2 Analysis of yield and weight density test three times the weight gain multiple boxes were M, 4.2, M23.9 , M32.9. It can be seen, when the eel species stocking density 0.7kg / m times when weight gain most. This situation may be attributed to put less weight maintenance, cage load is always low, ensuring high-speed growth of eel. Per unit area also proved this point. Since the production of low stocking densities (2.9kg / m), so its production is largely meaningless. M2, box has a high weight gain factor and the production value high. Table 2 Test cages eel feed the outputs of the weight gain test 312I multiple boxes are sl3.9, s24.2-, s33.7. Feed use are: 242,295,1011 ��g, feed coefficients were 5.5,5 and 1.4, eel feed cost per kg 12.1, ll and 9.1 yuan. Can be seen that the number fed cooked food boxes the best, size large, multiple major weight gain, high output, low feed conversion ratio, feed cost is low. Box S, although the specifications are great, but because the survival rate is not high, so the quantities are relatively low. Survival rate is not high because the case occurred Aug. 19 in a disease. 3 Summary and discussion during the test by culture on the observation of the biological characteristics of eel, breeding domesticated,[link widoczny dla zalogowanych], eels 11_ ~ / 1 'greatly improved the habits of fear of panic. L1 ��g per square meter of stocking eel species is more appropriate stocking densities, can not be too high or too low to achieve the best results. The literature that the eel in the water temperature at 10 �� and over 30 ��,[link widoczny dla zalogowanych], indigestion. Through this experiment, we found that the water temperature at 24 ~ 3l �� strong when the eel feeding, water temperature exceeds 33 ��, food intake decreased. When the water temperature down to l3 �� and over 34 ��, the eel was stopped feeding. 3 breeding diet significantly different results than the cooked feed (cooked carp) the best, but from the perspective of large-scale production, feed with a comprehensive advantages, better promotion prospects. In this culture study, nearly 50% of the seed is self-sufficient. In the Lunar New Year Dragon Boat Festival (fifth day of May) before and after the oil Levin straw heap in the shallow water fish pond, 2 ~ 3d, the use of push nets Lay straw in the capture of oil a lot of eel species, a large quantity of about per hectare can be ��collected 901 g, can meet the needs of some species of eel. This approach has a certain area in the water network to promote value. The test at the end of the harvesting Shihai breeding cages found there a number of small size eel species, how to protect the use of these species bred eel (not to be self-mutilation), is our next study. Feeding experiment,[link widoczny dla zalogowanych], due to changes in the environment and other factors likely to cause the stress response eel, the mortality rate sometimes as high as 95%, so the transfer pool should try to avoid the behavior changes the environment, and where grading, sub box, the operation shall may be lightweight and fast. This also applies to species of eel stage, put in the time eel fry sure to select the sunny, temperature 20 ~ 25 ��, the climate can be relatively stable time period of about 5d; temperature changes quickly, rainy weather conditions seedlings can not vote. Wild eels live in a more pure, micro-water environment,[link widoczny dla zalogowanych], the artificial breeding is best to create a micro-water environment. In addition, a few days before the sudden change in weather, the use of chlorine dioxide Quanchiposa 0.3mK/m3 eel can effectively control the temperature syndrome. (Editor Zhangjun You)
More articles related to topics：

ghd piastre Idiom of the

[link widoczny dla zalogowanych]

[link widoczny dla zalogowanych]