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1. Strengthen the preparation of juveniles before leaving the pool
First, to strengthen the exercise before the seedlings go to the sea: immediately after the indoor seedlings have been attached, the force and time of the moving water should be increased.
Second, increasing the amount of bait to accelerate the growth of juveniles: After the metamorphosis of the larvae, the viability is enhanced, and the amount of bait can be increased by 1-2 times in the early stage so as to accelerate the growth of the seedlings and make the body longer than 500 μm and then transferred to the sea for rearing.
Third, strengthen the light: the color of the shell is directly related to the light intensity. In order to grow seedlings healthily and adapt to the natural light intensity at the sea, and reduce vertical movement to cause shedding, measures can be taken to increase the light intensity of the nursery room as much as possible.
Fourth, wash down the dense and weak seedlings before the sea: the adhesion type shellfish have habits of gathering, due to the limited space within the pool picker, so there is too dense phenomenon, especially in the corners and near the water surface Collectors often gather on the harvester. These seedlings are easy to come off in groups after being released into the sea. Therefore, in addition to changing the positions of the curtains and inverting the curtains to reduce clumping, the seedlings must be washed before the lower reaches of the sea in order to reattach them to the blank curtains. Then go to the sea.
Fifth, in the proper period of time, the sea: The attached young workers should not be cultured in the room for a long period of time. Generally, they can go to the sea after a few days or the body length is longer than 500 μm. Before the sea should pay attention to the temperature does not differ too much, and listen to the local weather forecast to prevent the sea from being hit by large waves, and resulting in serious silt deposition. In addition, we must also pay attention to try to avoid the time when the attached organisms, such as sea squirts and seaweed, multiply.
When you go to the sea, you should choose to stay in calm, morning, evening or cloudy days. Avoid exposure and strong light stimulation. Transport can be dry, but cover the equipment to keep it moist. The operation should be light, the water layer under the sea is about 1 to 1.5m under the water (to prevent wind, light, and anti-attachment). After it is adjusted, the water layer can be raised. 2. Prepare the nursery equipment before leaving the pool.
(1) Prepare all kinds of mesh bags, cages, plastic buckets, seedling mesh bags, and all other tools for use out of the pool some time before leaving the pool.
(2) Choosing a middle-fertile sea area: First, the sea area should be selected, and trusses and rakes should be set up. In the temporary sea area, small waves, smooth water flow, clean water, no floating mud and pollution, and fertile sea areas should be selected.
3. Juvenile count before leaving the pool
When juveniles come out of the sea, they must first count the number of juveniles, so that they can easily count the seedlings and maintain the seedlings, and at the same time, they can easily control the stocking densities. Counting method can be used sampling method to calculate the average unit area (or length) or a single seedling harvester; can also be used weighing method, take a small amount of seed weighing count, so as to calculate the total weight of the total individual number.
Intermediate breeding
Because young juveniles and juveniles are very unstable, they are easily cut off and moved to other parts of the sea. When they go to the sea, the environmental conditions suddenly change, which results in the dropping of the attached shellfish into the sea, and the current seedling survival rate of the attached shellfish. All of them are relatively low, mussels are preferably up to 50 to 60%, and scallops are 20 to 30%. Therefore, the transition to the sea is a key link in artificial breeding.
When scallop larvae are raised indoors to 350 to 450 μm in diameter, they can be moved to the outside for temporary conservation. In order to adapt to the differences in indoor and offshore water temperature, the water temperature is gradually reduced to near natural water temperature before going out of the pool. At this time, because of the small individual, after cooling, the adhesion is weakened, and the adhesiveness is easily detached from the attached matrix, and the adaptability to the outside world is poor. Therefore, it is the peak period of death before it grows to 2mm. This stage is also the key to raising the seed in the middle.
The physicochemical and biological conditions of the water area are the material basis for the habitat and growth of the animal. Selecting the appropriate intermediate holding water area is one of the important links for improving the seedling maintenance rate.
The juvenile holding area should choose small waves, smooth water flow, flow rate generally 20-30cm/s, seawater transparency 1.5-2m above, no fresh water injection, stable seawater physicochemical factors, no industrial and agricultural pollution nearby, rich biological feed, water temperature The inner bay, which is rising quickly, is ideal.
When the water temperature of the sea area in the holding area reaches 10-13 °C, Bei Miao can be transferred from the indoor to the sea for intermediate holding. Because sea areas are affected by wind and waves and weather conditions, Bei Miao should listen to the weather forecast in time before going down to the sea. It is better that the weather is not affected by strong winds in 3-4 days after the big tide. Otherwise, if it is affected by big waves, there will be a lot of Pui Miao. Shedding, heaping up, biting each other to death, or muddy sea water caused by wind waves, the juveniles' cockroaches are covered with mud and sand, and cannot be killed by normal breathing and water exchange. In the first week of the sea of ​​Bei Miao, the influence of wind waves and the size of storms played a decisive role in determining the seedling maintenance rate in the middle of seedlings.
Japan's Riyuebei breeding technology
The intermediate breeding of shellfish seedlings refers to the fact that the juveniles are cultivated in one stage in the indoor environment and it is difficult for the indoor environment conditions to meet the needs of the growth and development of juveniles (the cost is too high). After reaching a certain standard, they move to marine cultivation. For breeding, breeding of seedlings.