How to choose fry for raising loach?
1, loach inch seedlings
After about 20 days' cultivation, loach seedlings has become an inch seedling. At this time, the adaptability and resistance of loach fry are further enhanced, and its feeding management is relatively extensive, which is also the first choice for many farmers. The input of inch seedlings is generally: 30,000-50,000 seedlings per mu in taiwan loach; The seedlings of Lepidium chinense and Misgurnus anguillicaudatus are about 80,000 inches, and the specific dosage should be appropriately adjusted according to the conditions of breeding water sources. When farmers buy inch seedlings, they should choose breeding units that have the ability to breed loach. Now there are many breeding units, and there are even fewer technicians, service personnel and other staff. Do they have the energy to do breeding well? Do they have the strength and energy to explore, innovate technology and develop loach breeding industry? Many farmers pay high prices to buy two, three or even inch seedlings propagated by commercial loach.
It should also be noted that the fattening stage after inch seedling is the key to yield. Don't think that everything will be fine if you put the inch seedlings in. A series of work such as pond preparation, pond cleaning, hydroponics, feed management, disease prevention management and water quality regulation are indispensable in aquaculture. Don't be fooled by what some units say to sell seedlings.
2. Loach seedlings.
Because of the high cost of purchasing inch loach seedlings, it is undoubtedly a considerable pressure and burden for farmers with large scale or poor economy. In order to reduce the cost of raising seedlings, many farmers choose to buy loach seedlings for breeding. Taiwan loach generally puts about 200,000 seedlings per mu. 500,000 open seedlings of Lepidoptera monitor lizard and loach will be invested per mu, and about 2,000 yuan will be invested per mu of culture area. However, if you buy Kaikou loach seedlings, you should choose a strong breeding unit to confirm its breeding variety and quality. At present, many breeding units do not breed loach at all, but buy commercial loach breeding directly from the market and sell it in loach seedlings. How good can loach seedlings be? Loach seedlings cultivated in this way has many varieties, slow growth, low feed conversion rate, and no good yield at all, let alone gain breeding benefits.
Although it only takes about 20 days for loach seedlings to reach the specification of inch seedlings, the cultivation stage of opening seedlings is fine and technical, so farmers must master the cultivation methods, otherwise the survival rate of opening seedlings is not high and the yield will be affected.
3. Self-propagation of loach seedlings
Misgurnus anguillicaudatus has high fecundity, which is propagated by self-propagation in loach seedlings. The investment cost of fry is the lowest, and the farming area per mu is only about 1 10,000 yuan. Generally, farmers with a slightly larger farming area adopt this method. By self-breeding, the species of loach can be mastered, and the quality of the bred loach fry is quite stable, without long-distance transportation, and the survival rate is also high after release. Therefore, farmers can undoubtedly obtain higher economic benefits by mastering loach breeding methods, loach breeding methods and loach breeding management system and developing loach self-propagation and self-support mode, which is also the inevitable trend of loach industry development.
4. Wild loach seedlings
The traditional breeding of loach is to buy wild loach nearby for artificial breeding in areas with abundant wild loach resources and low sales price in loach seedlings. A large number of farmers in Lianyungang, Jiangsu Province buy wild loach at a low price every June or so and put it in the pond. /kloc-will be listed one after another after 0/0 months. Generally, 400-500 kg of seedlings per mu can yield 800- 1000 kg. Now, because the seasonal price difference of loach is getting smaller and smaller, and the wild resources are getting less and less, few farmers have adopted this method. Especially in areas where wild loach resources are exhausted, if you don't know the quality of loach fry and the origin of loach, don't blindly buy it from some units at high prices, let alone buy it from traffickers, so as not to cause great losses.
How to choose feed
1, bait selection
According to the nutritional needs of loach, provide it with a balanced diet. The quality and safety of compound feed produced by regular feed manufacturers can be guaranteed. The feed is special feed for loach or fish feed, and fry powder with protein content of more than 40% is selected at seedling stage; The feed is granular, with protein content of about 36-38% and particle size of 0.5-2mm. In order to master the feeding amount, observe the feeding situation of loach and reduce the waste of feed, it is suggested that novices choose floating granular materials.
2. Feeding principle
⑴ Four feeding decisions: fixed point, fixed quality, fixed quantity and fixed time.
① Fixed-point feeding can make loach form the habit of centralized feeding, reduce the waste of bait, facilitate artificial observation of loach feeding and adjust the feeding amount in time. Set a feeding point around the pond 1.5-2 meters, and directly place a feeding floating frame to feed the floating material.
(2) The feed for qualitative feeding of loach must be fresh and nutritious, and it is strictly forbidden to feed the feed with spoilage. Don't change the feed suddenly in the middle of breeding. If changes are needed, there should be a transition period of 5-7 days.
③ When the quantitative loach size is 500- 1000 per catty, feed it four times a day, and the daily feeding amount accounts for 8% of the loach weight; When the loach size is 0/00-200 per catty, it is fed three times a day, and the daily feeding amount accounts for 7% of the loach weight; When the loach size reaches 50- 100 per catty, feed it three times a day, and the daily feeding amount accounts for 5% of the loach weight; When the loach size is less than 50 loaches per catty, feed it twice a day, and the daily feeding amount accounts for 3-4% of the loach weight.
④ Misgurnus anguillicaudatus has two obvious feeding peaks in one day, one day and one night. Generally, adult loach is fed twice a day, from 6: 00 to 8: 00 in the morning (after dawn) and from18: 00 to 20: 00 in the evening.
(2) Feeding as appropriate.
The daily feeding of loach bait is closely related to the weather and water quality. When the weather is bad, it rains or cools down, feeding should be reduced as appropriate. When the water quality is polluted, feeding should be reduced or not, and feeding should be resumed after the water quality is solved in time. Pay attention to the observation after feeding the loach, and take half an hour to finish it.