In 2005, many fishermen engaged in the conservation of seedlings in the scallops of the bay scallop were not effective. Except for the impact of climate change, the main reason was the technical operation. To raise the economic benefits of scallop shrimp pond conservation this year, we should focus on improving the quality of seed quality and survival of the seedlings and go out of the following six errors.
First, shrimp pond environmental conditions are not suitable. The water depth is less than 1.2 meters, and the daily water exchange capacity is less than 10%; the bottom of the shrimp pond is the soft mud bottom, the pool edge is not compacted, the pool water is easy to be turbid in the case of strong wind, and the mesh hole of the seedling bag is blocked; the fertilizer water prematurely causes aging of the bait in the pool water, and the hook Shrimp or protozoa are multiplying; shrimp pond area does not match the number of seedlings kept, the seedling density is too large, and there is a shortage of bait in the later period. All of these factors can affect the growth rate of seashell seedlings and lead to a decrease in the survival rate.
Second, juvenile exit time is too early. Blindly pursuing early seedlings, the water temperature of juveniles entering the shrimp pond is below 13°C for a long time and is not stable, and the shellfish metabolism is low and the growth is slow. If it is detached, the reattachment is difficult. Once cold air activity is encountered, the water temperature may even drop to about 8°C, causing juveniles to be in a closed shell state, affecting growth and survival.
Third, juveniles are of poor quality. Juvenile size below 400 microns, poor feeding, poor vitality, weak adhesion, without cooling exercise, enter the shrimp ponds often can not adapt to changes in the external environment, the survival rate of seedling survival is extremely low. Attention should be paid to inquire about the sources of seedlings and probiotics, such as source specifications, ripening time, breeding conditions, drug use, feeding species, etc., combined with microscopic examination, visual observation, swing test, and temperature drop test to check the adhesion, feeding, vitality, and Specifications and other indicators, comprehensive evaluation of juvenile seedling quality.
Fourth, juvenile out of the pool count is not allowed. The main sampling method is that it is not representative. In the densely populated area, there are multiple points, and the non-concentrated areas do not take or take less. Each point only uses water layers or sites with more seedlings. The total number of attachment bases includes the bottom curtain, but when sampling Do not take; followed by even counting at the time, deliberately overstate the number of attachment base. These phenomena have led to a far greater number of counts than the actual number of juveniles in the breeding nursery. Therefore, nursery ponds below 20m3 should be sampled at least 4 to 5 points, and large pools should be taken for more than 6 points. At the same time, the number of larvae and metamorphosis in the eye should be used as a reference.
Fifth, extensive daily management. Not flushing the seedling bag floating sludge in time, resulting in poor water quality and bait exchange inside and outside the bag; bagging and bagging are not timely, the seedlings in the seedling bag are crowded, polarization occurs, and the constitution is weakened; the action is too aggressive and the bag wall and the attachment The juveniles on the base were brushed down and piled up in the corner of the seedling bag. They bite each other to death. Followed by sub-miao seedlings in the plastic pots long time backlog of oxygen, dry dew for too long, after long time can not be re-dispersed seedlings attached to the seedling bags.
6. The deterioration of water quality conditions. The daily water exchange rate during the seedling conservation period should be gradually increased with the growth of the sea bass seedlings. When the protozoa multiply or the death of the monocytic algae causes the water color to mutate, it is necessary to change the water immediately; the transparency is maintained at 60 cm to 80 cm, and exceeds 80 cm. Topdressing inorganic fertilizers. Keeping the seedlings for more than 25 days will enter a dangerous period. When the water temperature rises, the bait is often difficult to meet the feeding needs of large-sized shellfish seedlings, thereby affecting the production of full-textured shellfish seedlings, which can easily lead to a large number of deaths. It is advisable to promptly enter the sea. (Author: Liguo Jiang; Zhang Guoguang; Jiang Yingjun)
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