Octopus culture method 1. Biological characteristics and artificial propagation
Octopus is a gentle mollusk. The water temperature should not be lower than 7℃, and the optimum proportion of seawater is 1.02 1, so it will die in low salinity environment. The best sediment in the sea area is gravel belt. When the water temperature is above 65438 02℃, larvae can lay eggs every year. After hatching, the larvae are about 3mm long and can grow up by feeding on large zooplankton. After 45 days, when the total length reaches 10- 13 mm, they will live on the seabed.
Octopus can be cultured in cages or in autumn.
Fry: The larvae of Japanese catfish caught in cages are the most suitable, and those caught by bottom trawl can also be used. The amount of seedlings released varies according to the water temperature and running water. 36-42kg seeds per L cubic meter in large cages, and 25-30kg seeds per L cubic meter in small cages. In order to prevent the fry from killing each other, the same batch of fry should be released, and the fry should be put into the cage after eating.
Bait: low-priced small miscellaneous fish and shellfish can be put in, and frozen small miscellaneous fish can also be put in, but it must be fresh. If the bait remains for a long time, the bait can be reduced or stopped. Two days is better, the residual bait will cause water pollution, and if you don't feed for more than three days, you will kill each other. When the water temperature is about 13℃, the feeding behavior is irregular, and when the water temperature is lower than 7℃, the octopus does not eat.
Survival rate: after two months of cultivation, the survival rate of cage-caught seedlings is 70%-80%, and the survival rate of fish-caught seedlings is about 50%. When the larvae were kept in cages, the mortality reached 20%-30% in 15 days, and then the mortality gradually decreased. After 15 days of culture, the octopus was divided into three sizes, big, medium and small, and kept in different cages. Clean the cage once every 0/5 days in spring and autumn/kloc-and once every 30 days in winter.
Second, the method of keeping octopus alive by cooling down
After harvesting, octopus can be easily transported and kept alive by cooling. The first step is to select the captured live octopus and remove the damaged and unqualified octopus. Put the selected octopus in clean seawater for 0.5? L, rely on the octopus's own physiological activities to remove the sediment, mucus and dirt in the sucker. When it is still unclean, you should not use your hands and any tools to remove impurities from the fish. You should put away the dirty water, replace it with clean seawater and purify it again. When adding water, don't go straight at the octopus, and try not to touch the octopus with your hands and other tools. Octopus caught from the ocean can survive for a period of time after being soaked in fresh water, but it is difficult for octopus soaked in fresh water to survive after cooling and dormancy.
Step 2, put the ice cubes in the sanitary plastic bag into the sea water, so that the temperature of the sea water drops to near 0℃, and the octopus is dormant at this time. Then put the dormant octopus into a plastic bag, add 20% clean seawater with water temperature close to 0℃, fill it with oxygen and seal it. The volume of oxygen is the same as that of seawater and octopus.
Step 3, add 2cm thick flake ice in sealed plastic bags at the bottom and around the incubator, put the packed octopus, put the flake ice on it, cover the incubator cover and seal it with adhesive tape.
The suitable cooling mode is 0℃. If the temperature drops below 0℃, the survival rate of octopus will be affected and even freeze to death. From freezing to sales should be completed within 3-5 days.
How to raise octopus with high yield 1 and raise it scientifically?
When the weather is normal and the octopus has no floating head, it is necessary to feed more octopus, accounting for 35% of the annual feeding in August. When feeding, we should adhere to the principles of timing, fixed point, qualitative and quantitative, fresh bait, suitable protein and palatable specifications.
2. Adjust water quality
In early autumn, the water temperature is high, the climate is changeable, and the water quality is changeable. Octopus eats vigorously and consumes a lot of oxygen. The water level needs to be deepened by about 2.5 meters. Pay attention to regulating water quality, start aeration equipment regularly every day, keep dissolved oxygen above 5 mg, and keep the pool water fresh and cool, which provides good ecological conditions for octopus growth.
3. Strengthen the prevention and treatment of octopus disease.
August is the high season of octopus disease, so it is necessary to sterilize regularly to prevent octopus disease. Once you find octopus disease, you must prescribe the right medicine and treat it in time.
Introduction of Octopus Species Blue Ring Octopus
The blue-ringed octopus mainly lives in the Pacific Ocean, so it is named for its bright blue rings. They are extremely dangerous animals, and the venom secreted in their mouths can kill people. There is almost no pain after being stung by this octopus, and the toxic attack takes an hour. Fortunately, the blue-ringed octopus is not aggressive and rarely attacks humans.
Real octopus
Octopus is an authentic marine life, and the sea temperature is mostly around 35℃, with a minimum of 27℃. Octopus is a shallow benthic species with a water depth of 0 ~ 200 m, and its habitats are mostly rocky reefs, coral reefs and algae fields. Octopus shows negative phototaxis and solitude. Young octopus lives alone, does not interfere with each other, and has no fixed place to live. Like to eat crustaceans, eat irregularly, and eat when you want. Relatively speaking, eating at night or in the evening is more active. In natural distribution areas, octopus has two breeding peaks every year, the first in April-May and the second in 65438+ 10. Each female octopus has 65,438+00 ~ 500,000 eggs. The results showed that the incubation period of octopus was 47 days in the range of water temperature 17 ~ 19℃. The larva of octopus is very small, and its carcass is only 2mm long. The bottom of octopus is shifted by the water temperature. The optimum water temperature for growth is 16 ~ 2 1℃, and it grows rapidly. The daily weight gain rate is 13%, but its life span is very short, only 12 ~ 18 months.
Octopus is an important fishing target in China, mainly distributed in the southeast coast, and there are many places in Zhoushan, Pingtan, Xiapu, Xiamen, Shantou, Taishan, Dianbai, Zhanjiang and Beihai, Guangxi. Widely distributed in the Pacific Ocean, Indian Ocean, Atlantic Ocean and Mediterranean Sea south of Japan. The fishing season is divided into spring and autumn, March-May in spring and September-165438+1October in autumn.