Breeding Techniques of Gentian Grouper
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The reporter interviewed Shen Minghui, head of the project of the Provincial Fisheries Research Institute, about the living habits and breeding techniques of gentian grouper.
According to the nursery experience, Shen Minghui summarized several technical requirements for artificial breeding of gentian grouper.
Nursery preparation
Ginseng grouper fertilized eggs should be washed to eliminate dead eggs.
Breeding pond
Ordinary cement pool can be nursed. Miao Chi requires a depth of 1 meter and the water surface should be open. A shade net should be laid above the seedling pond to avoid direct sunlight. Key points: Light should be properly controlled, the light is too low, and larval opening is difficult to eat; light is too strong and the algae grow fast, which is not conducive to the growth of larvae.
Water temperature and salinity
Miao pool water temperature control in 25 °C ~ 28 °C, hatching nursery water and seedling pond water temperature should be controlled within 1 degree; salinity controlled at 28-33 ‰, pH 7.8-8.5.
Bait
Prepare the bait before nursery. According to different development stages of gentian grouper, different kinds of bait are replaced in time. Gentiana grouper can be fed with oyster eggs on the second day after hatching. After two days of continuous feeding, the rotifers are fed. When the yellow spots appear on the caudal fins of the gentian group, the locust food is fed. Until the fry grows to 2.5-3.2 cm, it can be transferred to nursery workshops for cultivation, and can be fed with insects, copepods, and fish, shrimp, shellfish and other meat.
Water quality
The stability and cleanliness of water quality is the key to the success of nursery. The seedlings can be inoculated with relatively stable green algae, and it is better to keep pale green in water. In addition, probiotics and supplemental algae are regularly added to ensure the stability of the ecological environment of seedling ponds.
Avoid fry
Shen Minghui said that the gentian grouper is cruel and will attack each other, and the large-sized ones tend to devour small ones. Therefore, after the fry grows to a certain stage, it must be reared by the size of the fry. In order to avoid fry between fry, the following points should be noted:
(1) Timely screening of sub-pools. Usually about 2 weeks once screening, when the water temperature is low can be filtered once 20 days -30 days.
(2) Baits should be fed enough to avoid the phenomenon of hunger. You can take multiple feeding methods.
(3) Maintain a reasonable cultivation density.
(4) Set up shelters in the water body, such as hanging algae or putting plastic pipes at the bottom, which can reduce mutual food.