Black fish and domestic fish polyculture

Mixed culture of domestic fish in black fish ponds

Due to the long-term feeding in the main black fish pond, the residue in the pond is increasing, and the fish excrement is also increasing, so the pond fertilizer and water is faster and easy to age. After mixed culture of some domestic fish, it can give full play to the mutually beneficial role between them, which can not only regulate the water quality, but also increase the fish yield.

I. Pond conditions

Ponds that raise black fish alone can be either soil ponds or cement ponds. The area can be large or small, ranging from a few square meters to 600-2000 square meters, but it is best not to exceed 2000 square meters. The depth of the pool is 1.5 to 2.0 meters. The bottom of the pool has no silt, good soil quality, strong water retention, intake and drainage system and anti-escape facilities. Where there are conditions, it is best to plant some aquatic plants such as water lotus or water peanuts around the pond, and the area is generally no more than 25% of the total area. During the period of high water level, when the pool ridge is low-lying, a 1-meter-high bamboo fence or net should be set around the pool as an anti-escape wall to prevent black fish from escaping when the ground is slippery in the rainy season.

II. Pond cleaning

Ten days before stocking, clean and disinfect the fish thoroughly with quicklime or bleach. After an interval of 3 to 5 days, the water should be injected (the water source should meet the @ # @ 233 water standard), the water depth is 0.8mm 1.0 meters, and the fish can be released in the water after the toxicity disappears.

III. Fish fingerling restocking

The stocking requirements of black fish fingerling are the same as those of monoculture in ponds, except that the number should be reduced as appropriate. The size of domestic fish is larger than that of black fish. In general, you can refer to the following model: 100,200 silver carp with a specification of 0.3 kg per 667 square meters, 30 carps with a specification of 0.4 kg, and crucian carp with a specification of 0.1 kg per tail.

IV. Bait

Domestic fish do not need special fertilization and bait, but mainly rely on pond fertile water and black fish residual bait. Black fish is a ferocious carnivorous fish, which can be fed directly to small, fresh freshwater wild fish, shrimp, chopped larger fish, and animal baits such as silkworm pupae, insects and slaughtered livestock and poultry scraps. In places where bait fish and animal bait are not easy to solve, artificial bait can also be fed. Feeding compound feed should be domesticated from a small age, and should not be mixed with live animal baits such as small fish and shrimp, so as to avoid eating live animal baits such as small fish and shrimp instead of compound feed, resulting in a waste of compound feed and reducing the effect of domestication, thus affecting the growth of black fish. The specific formula of formula feed can be flexibly mastered according to local conditions, such as fish meal (47%), various kinds of meal, peanut bran, wheat bran, corn meal, rice bran, etc. (48-51%) and bone meal (2-5%). To make an artificial formula feed containing 40% crude protein.

V. Daily management

The mixed culture of domestic fish in the main black fish pond does not need to be specially managed, but only needs to be managed according to the daily management method of monoculture in the pond.

Mixed culture of black fish in the main fish pond

Due to the strong ability of self-reproduction of common carp and crucian carp in the main domestic fish ponds, there are more seedlings of common carp and crucian carp, as well as more wild miscellaneous fish, which is not conducive to the growth of domestic fish. Adding a small amount of black fish can eat the self-propagating seedlings of wild miscellaneous fish and common carp and crucian carp, which can not only avoid the competition for oxygen and food of the seedlings, but also benefit the growth of domestic fish, but also obtain high-quality black fish and increase the benefit. The specific measures are as follows.

I. Pond conditions

Requirements and domestic fish pond conditions are the same, generally can raise domestic fish into fish ponds can be mixed with some black fish. However, it is required that the silt at the bottom of the pond is no more than 10 cm thick.

II. Pond cleaning

Ten days before stocking, clean and disinfect the fish thoroughly with quicklime or bleach. After an interval of 3-5 days, the water should be injected (the water source should meet the water standard for fish culture), the water depth is 0.8-1.0 meters, and the fish can be released in the water after the toxicity disappears.

III. Fish fingerling restocking

There are many factors involved in fish stocking, so it is necessary to make a suitable stocking plan according to the local actual situation in order to obtain good breeding effect. The stocking time of black fish is later than that of domestic fish. Domestic fish are usually released at the end of March and blackfish at the end of April.

When black fish is mixed with silver carp, bighead carp, grass, common carp, crucian carp, tilapia and other domestic fish, the specification of mixed domestic fish is about twice as large as that of black fish, so as not to be eaten by black fish. Mixed black fish should also be the same size and specifications, so as not to eat each other.

Generally, every 667 square meters of water is stocked with 80 fish fry of 4 centimeters of 5 centimeters and 40 fry of 6 centimeters of 7 centimeters, which can grow to the standard of commercial fish in the same year. The output of 667 square meters of water surface can be increased by 50 kilograms and 100 kilograms, and the output value can be increased by 800 yuan and 2000 yuan.

IV. Bait

The mixed culture of black fish does not need to be specially fed in the pond of adult fish, but mainly depends on the natural bait in the pond. If the natural bait is insufficient, some tilapia, meal strips, crabs, wheat ear fish and so on can be raised in the pond to lay eggs and reproduce to make up for the lack of bait.

5. Feeding and management

The mixed culture of black fish in adult fish ponds does not need special management, but only needs to be managed according to the method of daily management. However, when applying medicine in the pond to treat domestic fish disease, we should be careful to use ferrous sulfate, because black fish are very sensitive to ferrous sulfate and often poison black fish and other fish are safe. In addition, the mixed culture of black fish in the pond, when the fish comes out in the dry pond at the end of the year, they must be completely caught and must not be omitted, otherwise it will do great harm to the domestic fish species released next year.