Bao's bait cultivation

In the whole process of abalone breeding, Bao's bait resources are one of the keys to the success or failure of abalone breeding. Bao's bait is divided into two major categories: one is the bait used in seed production, mainly benthic diatoms and photosynthetic bacteria; the other is the artificial compound feed and natural macro algae in the process of bait farming Wait. This issue will introduce Bao’s bait cultivation and use methods. The benthic diatom is the basic bait of the larval and hatchery of the abalone. The photosynthetic bacteria serve as an excellent supplementary feed and water purification agent. The quality and culture level not only affect the collection rate of the planktonic larvae and the metamorphosis rate of the larvae. It also affects the breeding rate of young abalone, which directly affects the economic efficiency of abalone breeding. Therefore, the bait culture technology is also a key part of the aquaculture process of abalone and should attract the attention of the farmers. First, the benthic diatom bait cultivation 1. Inoculation time; benthic diatom culture time is too long or too short are not conducive to the collection and adhesion metamorphosis of planktonic larvae. The long time of cultivation of benthic diatoms can make the bait density high, but at the same time, it is also easy to age, which is not conducive to the collection of planktonic larvae. If the time of benthic diatom culture is too short, its density cannot meet the growth and development of carp larvae and young abalone, which will lead to a decrease in production and seriously affect the growth rate. In general, the start time of benthic diatom inoculation culture should be 1 month to 2.5 months before harvesting. According to the specific circumstances of flexible control. 2. The treatment of the seedling board is adopted; the seedling board is purchased as a special polyethylene corrugated board. Seedlings and picking equipment are washed, degreasing, and disinfected before they are put into benthic diatoms and algae. The solution can be soaked in 0.05% to 0.1% sodium hydroxide solution for 1 to 2 days, and then washed repeatedly with a detergent, and soaked and disinfected with a 5 mg/l sodium hypochlorite. 3. Selection of benthic diatom algae; selection of algae in the exponential growth phase of oviform algae or polycystis navalus is good, and the selected algae species should be purebred, can be cultivated by themselves or through the following species of pure algae A method to obtain algae: (1) natural growth method; into the sea water, increase the amount of water in the pool, apply nutrients, and cultivate natural algae species. (2) Brushing method; artificially adhered diatoms attached to the wall of the pool, the gutters along the sea, reefs along the seashore, and net cages in the sea can be artificially wiped with foam, etc., as algae, and cultivated in the same manner as in (1). (3) Collecting in the sea area; preliminarily suspending the sources of the natural sea area back to the pool by hanging polyethylene nets, plastics, etc. on floating rafts in the sea, and then cultivating it with the method (1). 4. Inoculation; 20 to 40 pieces of seedlings plated as a group of pool bottom, water injection has not passed the upper picking plate. The algae seed liquid was evenly spilled in the pool. After 24 hours, the seedling plate was inverted and inoculated on the other side. Then, the seedling plate was erected and fertilized for 24 hours. 5. Fertilization; Each time you change the water, you should add a certain amount of nutrients to promote the proliferation of diatoms. The formula is: applying sodium nitrate 10 mg to 25 mg + potassium dihydrogen phosphate 1 mg to 2.5 mg + sodium silicate 1 mg + iron citrate 0.1 mg + vitamin B 120.25 mg per 1000 ml of seawater. 6. Management; (1) It is better to keep the water temperature at about 10°C to 18°C. (2) Change the water 1 to 2 times a week and add nutrients in time. (3) The micro-aeration culture is conducive to the propagation of diatoms and the salvage bubbles on the water surface are salvaged in time. (4) The lighting control is better at 1500 lux. (5) Kill copepods in time. Second, the cultivation of photosynthetic bacteria Photosynthetic bacteria can use under the condition of oxygen, hydrogen sulfide, ammonia nitrogen and other organic substances in the water as its nutrient source for growth and reproduction, can play a role in the decomposition of harmful substances in the pool, purify water quality. Photosynthetic bacteria as a bait resource is also very rich in nutrients, and it is a high-quality supplementary feed for Bao Miao. The method for cultivating photosynthetic bacteria is to use the soup remaining in the processed shellfish, fermented, boiled, filtered and used after adding potassium hydrogen phosphate 0.05%, sodium acetate 0.2%, ammonium chloride 0.2%, and protein moon east 0.2% With a small amount of B vitamins, this solution can be used as a culture solution for photosynthetic bacteria. A small amount of photosynthetic bacteria can be purchased and put into it, which can reach a certain density after a period of time. When photosynthetic bacteria are used as bait, the feeding density is generally 1108 cells/ml water body to 2108 cells/ml water body.

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