Grouper fry culture method

Abstract

The invention relates to the field of aquatic fry culture, in particular to a grouper fry culture method. The grouper fry culture method comprises the following steps of (1) respectively activating photosynthetic bacteria and bacillus, culturing to a logarithmic phase, centrifuging, taking a precipitate, suspending the precipitate by a phosphate buffer solution, respectively obtaining a photosynthetic bacteria solution and a bacillus solution, and mixing the photosynthetic bacteria solution and the bacillus solution, so as to obtain compound bacteria liquid; (2) disinfecting a fry culture pool, and cultivating algae; (3) distributing fish eggs and culturing fries: distributing the fish eggs into the fry culture pool, replacing water at the interval of 15 to 20d in the fry culture process, and adding nutritional salt and the compound bacteria liquid into a culture water body; (4) harvesting: culturing and hatching, so as to obtain the grouper fries. The grouper fry culture method has the advantages that a small amount of the algae, organic matters and microorganisms exist in the water, the easiness in major change of water quality is avoided, the water quality is relatively easily controlled, a fry culture technique is stable, and the survival rate of fry culture is high.

Description

technical field [0001] The invention relates to the field of aquatic seedling raising, in particular to a grouper seedling raising method. Background technique [0002] Black catfish is grouper, commonly known by local residents along the coast. Living in the crevices of stones by the sea, it is called carp in the sea, but its food value and taste are actually higher than that of carp. It is more expensive than common fish. [0003] Existing grouper nursery method mainly contains two kinds, and a kind of is the outdoor pond nursery method, and this method is to cultivate basic baits such as unicellular algae, rotifers, protozoa in pond earlier, and then the fish fry that hatch out Put it into the pond, the fry can feed on the basic bait in the pond, and usually adjust the water quality according to the water color, and then feed the fleas every day until the fry are harvested. Due to the large water body and stable water quality, this method is easy to cultivate fry, but ...

AI Technical Summary

Problems solved by technology

Due to the large water body and stable water quality, this method is easy to cultivate fry, but because it is outdoors, it is greatly affected by the weather, and it is easy to encounter bad weather such as sudden and large low temperature, high temperature, large temperature difference between morning and evening, continuous heavy rain, etc. The other is the method of raising seedlings in indoor cement ponds. This method is also to cultivate basic baits such as unicellular algae, rotifers, and protozoa in indoor cement ponds, and then put the hatched fry into fertile water. Cultivate in a cement pond, adjust the water quality according to the water color, and then feed the fleas every day until harvesting. Due to the small size of the room, the algae in the water body are affected by factors such as light intensity, temperature, and the growth of the algae. It is difficult to control the water quality. The growth of algae is not easy to control, and the algae will suddenly explode or die in a large area, pollute the water quality, release harmful substances, and the water quality of the nursery pond will change greatly. Water quality factors such as ammonia nitrogen, dissolved oxygen, and PH value suddenly Increase or decrease, resulting in a large number of fish fry death, unstable breeding effect