Artificial culture technology of octopus

Octopus is a temperate mollusk, living underwater, adapt to water temperature can not be lower than 7 ℃, sea water proportion of 1.021 is the most suitable, low salinity environment will die, widely distributed in tropical and temperate waters around the world, China's north and south coastal areas are distributed, fishing season is divided into spring and autumn, spring March to May, autumn September to November, let's take a look at octopus artificial culture technology!

Octopus culture in plastic bottles

The plastic bottle culture of octopus is to use the wild young octopus to put the wild young octopus in a 500ml discarded beverage bottle with fine holes, seal the mouth of the bottle, hang it with a series of ropes, raise it naturally in the sea, and add a floating ball at appropriate intervals to achieve better results. Although this method is simple, octopus grows slowly and is suitable for culture in sea areas rich in plankton.

Cement pond culture method

The cement pond culture method uses 8 cement ponds with a depth of about 20 square meters and 80 centimeters, the bottom of which is covered with 20 centimeters of 30 centimeters thick (50 centimeters thick in the center of the pool) and injected with precipitated sea water. A total of 10 million 50 grams (average 40 grams) of octopus larvae dug on the beach were released and fed once a day in the afternoon. the bait was live crabs dug from the beach (individual 2cm 6g, average 300 / kg). The indoor light is between 800~1000LX. In the process of culture, the precipitated sea water is used to change the water once a day. As long as the water is changed carefully in the high temperature season, Zhang generally does not die. After about 6 months of feeding, the individual generally reaches 50 grams 100 grams (about 70 grams on average) before fishing. The method is simple and feasible, and the technical requirement is not high, so it is suitable for small-scale family breeding.

Octopus purse seine culture

Octopus purse seine culture is in the middle and the most exciting part of the beach to raise the octopus with a dense net of about 3000 square meters, the octopus hides in the cave when the tide is out, but the net of the purse seine should be higher than the highest tide to prevent escape. The method has the advantages of simplicity and low cost, but it has a large area and takes a lot of work at harvest.

Octopus cage culture

1, cage setting: can use cage culture (3.94m × 1.82m × 0.9m), the mesh is smaller than the fish species, need to add a net cover to prevent octopus escape, mostly in the harbor with quiet waves, the suitable water temperature is 15: 23 ℃, in general, it is more in spring and summer (June, July) and autumn (10 ~ December).

2. Seedling stocking: octopus fry caught in cages are the most suitable, and those caught from the bottom dragging net can also be used. the amount of seedlings varies according to water temperature and running water conditions, using large cages to release seedlings 36 kilograms per cubic meter, and small cages for stocking seedlings 25 kilograms per cubic meter. In order to prevent seedlings from killing each other, the same batch of seedlings should be put into the cage after satiety.

3. Bait feeding: small mixed fish and shellfish with low price can be put, and frozen small mixed fish can also be put in, but they must be fresh. It is better to reduce or stop feeding for 1 ~ 2 days when the residual bait is long. It will cause water pollution. If you stop feeding for more than 3 days, you will kill each other. The feeding behavior was irregular when the water temperature was about 13 ℃, and the octopus did not eat when the water temperature was below 7 ℃.

4. Aquaculture management: cage culture is suitable for large-scale aquaculture. The survival rate of seedlings caught in cage is 70% 80% after 2 months, and the survival rate of seedlings caught by fishing is about 50%. When the seedlings were released in cages, the mortality rate reached 2030% on the 15th, and then the death rate decreased gradually. After 15 days of culture, the octopus was divided into large, medium and small sizes and cultured in different cages. Clean the cage once in 15 days in spring and autumn and once in 30 days in winter.