How to breed octopus
Octopuses belong to the Octopus family of the family Cephalopod. They have a short body, an oval shape, no fins, and are non-venomous. They mostly inhabit shallow sea gravel, soft mud and rocks, and feed on crustaceans. What are the methods of raising octopus? Let me take you to learn more about it.
How to breed octopus
1. Biological characteristics and artificial breeding
Octopus is a temperate mollusk. It can adapt to water temperatures not lower than 7℃ and the specific gravity of seawater. 1.021 is the most suitable and will die in low salinity environments. The best substrate in the sea area is a gravel zone. The water temperature is above 12°C and can spawn every year. After hatching, the total length of the larvae is about 3mm. They can feed on large animal plankton and grow. After 45 days, when the total length is 10-13mm, they will settle. Live a benthic life in the seabed camp.
Octopus can be cultured in cages and in autumn.
Seeds: Octopus fry caught in cages are most suitable, but those caught from bottom trawling nets can also be used. The amount of seedlings planted varies according to water temperature and running water conditions. Use large cages to stock 36-42kg of seedlings per cubic meter, and use small cages to stock 25-30kg of seedlings per cubic meter. In order to prevent the seedlings from killing each other, the same batch of seedlings should be placed. The seedlings should be put into the cage after they are full.
Bait: Cheap small miscellaneous fish and shellfish can be put in. Frozen small miscellaneous fish can also be put in, but they must be fresh. If there is a lot of leftover bait, the bait can be reduced or stopped for 1 to 2 days. It is better, as residual bait will cause water pollution. If feeding is stopped for more than 3 days, it will cause mutual killing. The feeding behavior is irregular when the water temperature is around 13℃, and the octopus does not feed when the water temperature is below 7℃.
Survival rate: The survival rate of seedlings caught in cages after 2 months of breeding is 70% to 80%, and the survival rate of seedlings caught by fishing is about 50%. When the seedlings are stocked in cages, the mortality rate reaches 20% to 30% on the 15th day, and then the mortality rate gradually decreases. After 15 days of breeding, the octopuses were divided into three sizes: large, medium and small and were raised in different cages. The cages are cleaned once every 15 days in spring and autumn, and once every 30 days in winter.
2. How to cool down and keep octopus alive
After the octopus is harvested, a method can be adopted that is convenient for transportation and can keep the octopus cool down and keep alive: the first step is to remove the captured live octopus. The octopuses are selected from healthy individuals, and damaged and substandard octopuses are discarded. When the selected octopus is placed in clean seawater for 0.5?l, the octopus's own physiological activities are used to remove sediment, mucus and dirt in the sucker. When it is still not clean, do not use your hands or any tools to remove debris from the fish. You should drain the dirty water and replace it with clean seawater for purification again. When adding water, you should not directly hit the octopus. Use your hands as little as possible during the whole process. Other things touch the octopus. Octopus caught from the ocean can survive for a period of time after being soaked in fresh water, but it is difficult for octopuses that have been soaked in fresh water to survive after cooling down and dormant.
The second step is: use hygienic plastic bags to pack ice and put it into the seawater, so that the temperature of the seawater drops to close to 0℃. At this time, the octopus is in a dormant state. Then put the dormant octopus into a plastic bag, add 20% clean seawater with a water temperature close to 0°C, fill it with oxygen, and tie the mouth to seal it. The volume occupied by oxygen is the same as that of seawater and octopus.
The third step is to add 2cm thick flake ice packed in a sealed plastic bag to the bottom and sides of the incubator, put the packaged octopus in, put flake ice on top, and cover it with insulation Box lid, sealed with tape.
The cooling method is preferably 0℃. If the temperature drops below 0℃, it will affect the survival rate of the octopus and even freeze it to death. The period from freezing to sale should be completed within 3-5 days. How to raise octopus with high yield
1. Scientific feeding
If the weather is normal and the octopus has no floating head phenomenon, it is necessary to feed more. August accounts for 35% of the annual feeding. The principles of timing, fixed point, fixed quality and quantity should be adhered to. The bait should be fresh, the protein should be appropriate, and the specifications should be palatable.
2. Adjust water quality
In early autumn, the water temperature is high, the climate is changeable, and the water quality is easy to change. In addition, octopuses eat vigorously and consume large amounts of oxygen. The water level must be deepened by about 2.5 meters. . Pay attention to adjusting the water quality, start the oxygenation equipment regularly every day, keep the dissolved oxygen above 5 mg, keep the pool water alive and refreshing, and provide a good ecological condition for the growth of octopus.
3. Strengthen the prevention and control of octopus disease
August is the season of high incidence of octopus disease. Regular sterilization and disinfection are required to prevent and control the occurrence of octopus disease. Once octopus disease is discovered, it is necessary to prescribe the right medicine and treat it in time. Introduction to octopus species
Blue-ringed octopus
Blue-ringed octopus mainly lives in the Pacific Ocean and is named after the bright blue rings on its body. They are extremely dangerous animals and the venom secreted from their mouths can kill people. There is almost no pain when stung by this octopus, and the poison does not kick in until an hour later. Fortunately, blue-ringed octopuses are not aggressive and rarely attack humans.
True octopus
True octopus is an authentic marine creature. The temperature in the sea area where it is distributed is mostly around 35℃, with a minimum of 27℃. True octopus is a shallow sea-dwelling species, inhabiting water depths of 0 to 200m, and its habitats are mostly rock reefs, coral reefs, and algae fields.
True octopus shows negative phototaxis and seclusion. Young octopuses come and go alone, do not interfere with each other, and have no fixed place. They like to eat crustaceans. They eat at no time and eat whenever they want. Relatively speaking, they are more active in feeding at night or in the evening. In the natural distribution area, true octopus has two breeding peaks every year, the first is seen in April to May, and the second is seen in October. Each female octopus holds 100,000 to 500,000 eggs. Research shows that under water temperature conditions of 17 to 19°C, the incubation period of true octopuses is 47 days. True octopus hatchlings are very small, with the carcass only 2mm long. The true octopus rests on the bottom depending on the water temperature, and the optimal water temperature for growth is 16-21°C. It grows very fast, with a daily weight gain rate of up to 13%, but its lifespan is very short, only 12-18 months.
True octopus is an important fishery target in China. It is mainly distributed in the southeast coast, especially in Zhoushan, Zhejiang, Pingtan, Xiapu, Xiamen, Fujian, Shantou, Taishan, Dianbai, Zhanjiang, Guangdong, and Beihai, Guangxi. . And widely distributed in the Pacific, Indian Ocean, Atlantic and Mediterranean waters south of Japan. The fishing season is divided into spring and autumn, from March to May in spring and from September to November in autumn.