The cultivation of bulk freshwater fish fry refers to the development of fish seedlings with a total length of 1 cm to 3 cm, also known as summer flower cultivation. The length of fry cultivation depends on the size of the fry, the breeding specifications of the fry, and the feeding conditions and technical level. It usually takes about 20 days.
This instruction manual explains the key technical aspects of Tongwei's quality fry cultivation. It is suitable for the fry cultivation of large freshwater fishes such as cockroaches, cockroaches, grasses, cockroaches, etc.
Preparation instructions
The first preparation: pond preparation
The fish ponds that plan to cultivate large numbers of freshwater fish fry are required to have sufficient water supply, good water quality, and convenient drainage and irrigation. Secondly, choose a pond with regular pool shape, flat bottom, no leakage and ventilation. An area of ​​1 mu ~ 3 acres is appropriate.
The specific steps are as follows:
(1) 15 days to 20 days before stocking fish fry, maintenance and disinfection of fish ponds and clear ponds. Lime clear pond can be divided into two methods: dry clear pond (60kg~70kg/mu) and water clear pond (200kg~250kg/mu). The dry clear pond method is generally used, and it is inconvenient or unable to be discharged. In the case of dry pool water, the water was cleared, and water was injected after 7 days to 10 days. Bleached clear pond: with water clear pond 15 meters per mu water depth of 1 meter, equal to 20 grams per cubic meter (even if the pool water up to 20ppm concentration); can also dry pond clear pond, the amount of 5 kg per mu. How to use: Lower the pool water to 5 cm to 10 cm. Dissolve the bleaching powder in the plastic container with water. Immediately afterwards, the whole pool should be splashed. After two days, water can be poured into the pool. After the pond is filled with water for 1 week, the fish can be released.
(2) An 80-mesh sieve is installed at the inlet, and a fish bar is set at the outlet. The width of the barrage is set according to the size of the outlet, and 18 mesh nets must be sewn on the barb.
(3) In the 7 days before frying, the water injection is 50 cm.
(4) 3 to 5 days prior to planting, composted manure 200 kg to 500 kg/mu or green manure 200 kg to 300 kg/mu. Newly-digging fish ponds should be increased in fertilization amount or by adding chemical fertilizers with a nitrogen/phosphorus ratio of 9:1 to 5 kg to 10 kg/mu.
Second Preparation: Materials and Tools
(1) 0.5-kilogram impeller-type oxygen aerator per acre (that is, a 3-kilowatt impeller-type aerator can meet the needs of 6-mu ponds), and water-jet aerators are prohibited.
(2) 1 soya-bean milk machine, 2 water buckets, 2 water scoops, 2 dry soya beans, 2 large water basins (0.8 m in diameter) (or 80 mesh small cages: LWH = 2m 2m 1m), One thermometer, 80 mesh sieve, and one small aerator.
(3) Opening feed preparation: On the day when the fry is released, un-degraded egg yolk (usually one egg yolk per 100,000 fry) is prepared after being cooked for more than one hour.
(4) When the fry bag is placed in the pool and temperature is adjusted, 80-mesh sieve is used to wash the egg yolk water.
The third preparatory work: Water test method before laying seedlings: In the day before the fish pond, take a basin of water from the pond, and put a few fry with similar specifications to the planned fry, and try to raise it for half a day. day. If the fry activity is normal and it proves that the toxicity has disappeared, fry can be placed in the pond.
Method 2: Take the bottom of the bowl one day before the bottom of the fish pond, and measure the pH of the water with a pH test paper. If the pH is between 6 and 8, fry can be placed in the pond.
★ Tips:
A fertilizer pond, rotifer peak time is the best time; if the rotifer peak has passed the lower pond, you can kill insects in advance with crystal trichlorfon, and then apply compost manure fertilizer.
2 Avoid the cold tide pond. When the temperature of the pond is too low, a temporary holding pool (microfluidic water) can be set indoors. After the cold wave passes, the pond is lowered.
3 Different fishes have different food habits. It is best to use specialized compound feeds to cultivate fry and ensure their nutritional requirements.
Instructions for putting fry
After preparing the pond and testing the water according to the above method, the fry already contacted can be stocked. The procedures for stocking fry are as follows:
The first step: After receiving the fry, first open the packing box and carefully remove the fry bag;
Step 2: Place the unopened fry bag in the pond where you plan to raise the fry. The time for placement is generally 0.5 to 1 hour. During this time, it is necessary to observe whether the activities of the fry within the fry bag are active and normal.
(1) If the fry in the fry bag is active, you can proceed to the next step: First, add one-fifth of the pond water to the prepared large plastic basin (0.8 m in diameter), and then untie the fry bag. Put the fry in the fry bag slowly into this large basin. Each pot is recommended to put up to 100,000 water drops. Put the prepared egg yolk into the basin slowly after putting it in the water, and slowly add the pond water to the basin until the water overflows the basin. Slowly sink the large bowl into the water and allow the fry to swim by themselves.
(2) If there are many fish seedlings in the fry bag, the fry bag should be untied immediately, slowly add a small amount of pond water to adjust the water temperature, and put it in the 80 mesh small cage that has been prepared before. At the same time continue to increase oxygen. When the fish cage in the small cage is recovered (ie, by hand mixing the fish in the cage and the fish can swim against the water), the prepared egg yolk water is slowly poured into the cage. After 5 minutes, unlock the cage and allow the fry to swim into the pond.
Special reminder: After the long-distance transport of the fry is in a coma, it is absolutely impossible to put the fry directly down the pond, otherwise it will cause a large number of fish fry and the survival rate is very low.
★ Tips:
1 The best time to put the fry is to choose sunny evenings. If the fry is received at sunny noon or at night, the fry is first raised in an indoor container (with 40,000 to 50,000 fish per 50 liters of water) and the water temperature is maintained at the appropriate water temperature. Feed the egg yolk water once, and it should be on duty by a dedicated person. Change the water every 1 hour (the water temperature must be the same) once and moderately increase oxygen to prevent the fry floating.
2 It is recommended that fish fry be first cultivated into Wuzi or fingerlings and then put into large ponds to grow adult fish.
Aquaculture management operation instructions
(I) Feeding management operations
(1) Sprinkle milk daily, soak 1 kg of dried soybeans per acre to soak the whole pool and gradually increase the amount of soybeans. Milk should be splashed with "as fine as fog, uniform rain." Do "three times two full pond" (that is, 3 times a day, 3 times the slurry, of which 2 times the whole pond spilled, 1 spill around the fish pond around), soy milk to freshly splashed, can not be put on hold too long.
(2) If the fry grows to more than 1 cm, it can be fed with special compound feed and soy milk. Gradually reduce the amount of soymilk according to the food intake until the whole powder (dry powder) is fed. The feeding range of compound feed powder gradually converges from the whole pool to the food table. Daily feeding no less than 4 times.
Ee Concentrates,Fish Oil Or Omega-3 Oil,Fish Oil 10/40 Ee,Fish Oil Ee Omega 3
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