(I)Fry breeding
In order to allow the fish seedlings to obtain a good quantity of palatable natural foods in order to accelerate their growth and increase the survival rate, it is necessary to apply basal fertilisers before the stocking.
Pest-feeding rotifers and nauplii and other small zooplankton in the early pond fish fry. According to experiments, the number of rotifers in fish ponds is about 10,000 per liter of water, and biomass is 20-40 mg/l. Fish fry is rich in palatability, rapid growth, and high survival rate. It can be used as a bio-indicator of “fed pondsâ€.
Fry ponds should take the following points:
1. Fish fry must be filled with fish and can swim flatly. When it can take outside foods, it can be discharged into ponds (normally 4-6 days). Prematurely, Xia Tang is prone to death.
2. The temperature of the fish in front of the lower pond should not be much different from the temperature of the pond. Try to ensure that the water temperature in the fry container is not more than 2°C from the temperature of the pond water, and then the fish fry the pond.
3. Thoroughly remove the predators in the pond.
4, the placement density: fry directly cultivated to summer flowers, the general stocking density of 8-10 million per acre. If the fish are raised to Wuzai (14-18 days), the general stocking density will be 18-200,000 per acre, and then the Wucai will be raised to 1.5-inch summer flowers (12-16 days). The general stocking density is 2 per mu. 30,000. Stocking densities vary with the pond conditions, the amount and quality of feed and fertilizer, and the date of release, water temperature, and feeding techniques.
5, feeding, management can refer to the pattern of home fish, squid, squid, basically the same.
(II) Feeding of fingerlings
The fish of the odor age cultivated in summer flowers, can be mixed, white oysters polyculture, must not polyculture with cockroaches, squid, because they eat basically the same, while the dinosaurs are less able to catch food than squid and eel. As a result, the expected outlet size is not reached.
Each year, the annual density of butyl summer fish is 8000-10,000, and the flowers and white storks are 2000-3000. The octopus fish species can reach 40-80 grams. (feed with pellet feed).
(3) Feeding of adult fish
Put 40-80 grams of small fish species, after the pellet feed. The general situation can reach 200-400 grams. Fully meet market specifications.
(four) bait
After the year of rearing, the annual freshwater fish receive artificial feed pelleted feed, and the optimum feeding temperature is 25-30°C. Due to the short-tailed omnivorous diet of fish, the dietary protein requirement is slightly higher than that of quail and mackerel. Fishmeal 15%, soybean meal 28%, rapeseed 10%, cottonseed 8%, subsurface 10%, wheat bran 11%, alcohol protein powder 10%, phosphorus 2%, zeolite powder 3%, additive 2%.
(E) Economic Significance
The annual growth of dicamba is slower than that of squid, faster than squid and easy to domesticate. The largest individual can reach 700 mm and weigh 7500 grams. The fish is very delicate, with high fat content and beautiful taste. It is a good raw material for raw fish skin and has a high commodity value. In particular, the thick fish skin of the fish has a unique taste, and it really feels like “the skin has passed and the teeth contain residual fragranceâ€. The market price of domestic origin, commercial fish is more than 40 yuan per kilogram, and there is no goods available. Currently, the market size of commercial fish is 200-400 grams. The fish market can meet the market specifications in the past two years, which is an ideal alternative to catfish and mackerel. The variety. At present, it is being concerned by the national aquatic product research department and production units.
The fish is rich in foodstuffs and requires low conditions. It can breed itself in natural waters and is an ideal breeding ground for reservoirs and ponds. In pond culture, it is perfectly possible to replace squid and squid. The ratio of pond cultivation is the same as that of puffer fish and squid. The aged pond was reared as far as possible from the puffer and squid. Because the squid's ability to snatch and swim was far worse than that of the squid, it was difficult for the squid to reach the expected catch size in the same pond.