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Stocking fish fingerlings in cages in autumn has many benefits, and the timing of release matters

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After autumn fertilization in the pond, fish fingerlings are generally in robust health and adapt easily to the cage environment. At the same time, overwintering in sunken cages in large water bodies not only consumes less body weight in the fingerlings than overwintering in ponds, but also, after overwintering ends and the cages are raised in spring, the fish begin feeding earlier, and their growth period is extended by about 1 month compared with fish stocked in spring, so the fish grow quickly and production increases noticeably. Compared with fingerlings stocked in spring, fingerlings overwintered in sunken cages grow about 30% faster and are about 35% larger in size when removed from the cages. Therefore, stocking fingerlings in cages in autumn for overwintering is a relatively scientific

After autumn fertilization in the pond, fish fingerlings are generally in robust health and adapt easily to the cage environment. At the same time, overwintering in sunken cages in large water bodies not only consumes less body weight in the fingerlings than overwintering in ponds, but also, after overwintering ends and the cages are raised in spring, the fish begin feeding earlier, and their growth period is extended by about 1 month compared with fish stocked in spring, so the fish grow quickly and production increases noticeably. Compared with fingerlings stocked in spring, fingerlings overwintered in sunken cages grow about 30% faster and are about 35% larger in size when removed from the cages. Therefore, stocking fingerlings in cages in autumn for overwintering is a relatively scientific stocking model. Its operational technical requirements are as follows:

1. Time of stocking into cages. Stocking into cages can generally be carried out from late September to mid-October, and a water temperature of 15°C-18°C is more suitable; it should not be done when the water temperature is below 10°C.

2. Disinfection of fingerlings. The disinfection work before stocking into cages can be combined with the transport of the fingerlings, that is, 20 minutes to 30 minutes before arriving at the destination, dissolve the drug and put it into the transport canvas basket or fish bucket. Generally, methylene blue or erythromycin specially used for aquaculture can be selected, and the drug dosage must be calculated accurately and must not be estimated at will.

3. Cage preparation. 7 days to 10 days before the fingerlings are stocked into the cages, place intact double-layer cages without damage into the water so that a layer of algae or sediment can attach to the surface of the cages, and then release the fingerlings, reducing abrasions to the fish body caused by new cages.

4. Management after entering the cages. After the fingerlings enter the cages, medicated feed should be given for a period of time so that the injured parts of the fingerlings during capture and transport can recover promptly, reducing the probability of fish diseases occurring due to infection.

5. Management before sinking the cages. Before overwintering in sunken cages, feed must be given until the fingerlings stop eating. The water temperature is about 5°C-6°C, in order to keep the fish robust before overwintering, and do not cause the fish to become weak due to stopping feeding too early.

6. Control of water temperature when sinking the cages. When sinking the cages, the water temperature should be selected at about 4°C. At this time, the water temperature of the upper and lower layers of the water body is basically the same, convection between the upper and lower water layers has ended, and the physiological state of the fish is stable when they sink, and they will not become restless due to changes in the water layer.

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