Breeding and adult fish breeding techniques of hybrid striped salmon
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According to the experience of fish breeding in Guangdong Province in recent years, the seedling cultivation and adult fish farming techniques are summarized as follows.
1 Seed cultivation
1.1 Pond preparation before stocking
Use clear lime to clean the pond and soak it for a week or more. If the lime concentration is large before the release of the seedlings, remove the clear pond water and add the well water (bearish water or hard water to raise the survival rate higher) to about 50-80 cm. Applying organic or inorganic fertilizer to cultivate enough zooplankton, the abundance of zooplankton in the pond will directly determine the survival rate of the zooplankton. Therefore, base fertilizer must be applied. New ponds are inoculated with a certain amount of phytoplankton and zooplankton to cultivate the required plankton. General organic fertilizer is applied one week before release, with an amount of 100-300k6/mu (depending on the old and new ponds and the amount of sediment); chicken manure can be applied 3-4 days before planting, with a dosage of about 150kg/mu.
1.2 Stocking and Feeding
2. The 10-day-old fry should be bred in the concrete pool in darkness until it reaches 2cm in length. The stocking density is 25-50 tails/m2. The suitable water temperature for this stage is 22-26°C. More than 26°C will increase mortality. Rate, dissolved oxygen is not less than 4mg/L, the food is mainly rotifers, protozoa, nauplii, etc., rotifers are the best food, but also can be fed Artemia, egg yolk and cooked soybean milk.
When the fry grows to 1.5-2cm, they can be transferred to a pond for breeding. The stocking density is 10000-20000 tails/mu. At this time, the natural baits are mainly floating crustaceans such as Cladocera and sat Copepoda and various insects. For food, when the fry grows to 2.5cm or more, artificial powder particles with a protein content of 45% can be fed.
1.3 timely fertilizer
Timely topdressing can ensure that the carp seedlings are continuously provided with sufficient natural food, and it is also the key to ensure the survival rate of the aquaculture, especially the survival rate from the opening of the food intake to the summer flowering period. After one week of stocking, apply inorganic fertilizer twice a week for three weeks. The application amount may be determined according to the changes in water color and water quality, generally 2-3 kg per mu.
1.4 Domesticated feeding
After 2-3cm fry, you can start feeding artificial bait to prevent mutual disability due to lack of natural food. Adhere to the "four determinants" (ie fixed-point, timing, qualitative, quantitative) began to acclimate, because the hybrid striped tick has the biological characteristics of the cluster feeding, and the appetite is strong, so the domestication is easier than the regular fish, generally 2.3 days Can be domesticated successfully. The content of crude protein in artificial diets was 45%-50% in the previous period and 40% in the latter period (available for quail and salmon feed), and the amount of feeding was 5% of the fish's body weight. 8%, once each morning, middle, and evening.
1.5 Grading culture
When the fish fry are cultured for 30-45 days, they should exercise by pulling nets and grading them according to the size of the fry, in order to avoid mutual food, and regularly use 5 tons of salt or formalin to disinfect ponds and fish to prevent diseases.
1.6 Water Quality Control
The requirements of water quality are not high for hybridization strips, and they can be stocked in water environments with different alkalinity, hardness, and pH values. The alkalinity can reach 100 mg/L, but it can be adapted in the water of less than 29m ore L; Alkalinity is often related to the hardness of the range of adaptation and alkalinity; PH value of the optimum range of 7.0 - 8.5, but the wider tolerance of FH values, pond culture, when the pH value of 2.5, hybridization In the short term, streak can survive; its optimal dissolved oxygen range is 6--12mg/L, the dissolved oxygen requirement in summer flowering stage is not less than 4mg/L, and the dissolved oxygen in fish species to adult stage is not less than 3.5mg/L. During the hot season, pay attention to the fish's lack of oxygen floating head and keep the water quality fat, live, and cool.