Fry breeding of mandarin fish

In the past ten years, mandarin fry cultivation techniques have been continuously improved and improved, and there are a variety of cultivation methods, from initial pond cultivation to factory breeding under artificial control conditions. Among them, it is considered that the ideal cultivation methods are: hatching ring (bucket) seedling, cage seedling, small cement pool seedling and small soil pond seedling and so on. In production, two or more forms are often combined. Specific methods often vary from place to place.

The main results are as follows: 1. The hatching loop (bucket) is a special water body, which simulates the natural ecological conditions and makes the fish eggs tumble continuously. The direct use of loop cultivation of fish fry provides the living environment needed for mandarin fry, and more importantly, when the mandarin fry is fed, it is more important to feed palatable bait fish-other live fry soon after detachment, which can not only meet the nutrition needed for the growth and development of mandarin fry, but also maintain fresh water quality. In the process of cultivating mandarin fry, attention should be paid to the disadvantage that the loop is not easy to discharge, so as to prevent the deposition of silt and humus in the loop. After 5-7 days of cultivation, you should choose a sunny day and turn around 10:00 in the morning. Mandarin fish fry are gluttonous, it is best to stop feeding bait fish 12 hours before turning, in order to ensure an empty stomach and reduce loss.

2. Net cage is an ideal place for mandarin seedling cultivation. It can not only ensure that there is sufficient and readily available bait, but also have fresh water for continuous exchange. The deficiency is that it can not feed the feed fish which has just taken off the film and needs to wash the box frequently and change the cage regularly. The management of fish fry is more tedious and the operation is more difficult. The cage generally adopts three-stage seedling method: I-class box, with 40-28 mesh / 3 cm ethylene mesh sewn into the old box, 4-6 meters long, 1 meter wide and 1 meter deep; II-class box, 2 meters long, 1 meter wide and 1 meter deep; III box, is sewn with 0.5cm warp knitted ethylene mesh, 2 meters long, 1 meter wide and 1 meter deep. The matching ratio of the area of I, II and III cages is LRV 10 / 20.

3. The cement pool for raising seedlings is generally 4 meters × 6 meters × 0.8 meters, which can also be slightly larger or smaller. However, there must be a certain tilt at the bottom, and a seedling pool is set at the bottom drainage, and there are inlet and drainage devices. The drainage device is composed of a rubber tube, a filter net and a supporting wire, and the rubber pipe mouth is fixed in the center of the wire rack, which requires that no matter how it is placed, it will not discharge into the pool water and seems to maintain a certain water level. The drainage flow is controlled by the number of drainage pipes and the height of the outlet.

4. when mandarin fish grow to about 3.0cm in small soil ponds, they can be put into small ponds for cultivation, and the amount of mandarin fish is about 150000 per hectare. Bait fish must be cultivated in advance in the pond. The fry of mandarin fish are generally released 10-15 days before the release of mandarin fish, and the amount of bait fry is 1500-22.5 million fish per hectare. Add a small amount of new water regularly every day to prevent the deterioration of water quality.