How to select and stock eel fry? Detailed methods

The fry sources for @#@236@#@ fall into two modes: self-breeding and self-raising, and purchasing wild yellow eels for farming. Here the focus is on purchasing wild yellow eels for farming. Purchasing wild yellow eels for artificial farming is currently the method commonly used by the vast majority of eel farmers; generally they are purchased and farmed from April to September, then caught and sold on the market in winter or around the Spring Festival, and can gain 1-5 times their weight (depending on the length of the purchase-and-farming period). Generally the summer purchase price is below 20 yuan/kg, and the winter selling price is above 40 yuan/kg, so the farming profit is very considerable. Generally the sources of yellow eels used for farming include: cage-caught, electro-caught, hand-caught, etc.; for hook-caught and clamp-caught yellow eels, they should be selected as appropriate according to the degree of injury; drug-caught yellow eels must absolutely not be used. The methods of purchasing yellow eels are generally self-catching and self-raising, ordering from familiar eel catchers, or purchasing from township markets; yellow eels that have been stored at high density for a long time and those from large farmers' markets cannot be used for farming. When purchasing at township markets, check whether the yellow eels have red or black gills (obvious congestion or congested blackening), red and swollen everted anus, obvious external injuries, etc. If the yellow eels of one household show these phenomena, do not purchase them; if you are not good at identifying them when purchasing for the first time, you can look at several more yellow eels and compare their gill color and anus, and it will not be difficult to tell. The yellow eels purchased for farming are best at 30-80 grams per fish; too large and the cost is high, and after growing to 300 grams their growth is slow; too small and they are relatively fragile, and the mortality rate after being injured by catching is relatively high. The purchased yellow eels should immediately be added to pond water and aquatic plants at no less than 4 times the body weight of the eels, and immediately transported for stocking. The stocking density of eel fry should be increased or decreased as appropriate depending on the length of the planned raising time, generally 1-3 kg per sq m. On the evening of the day the eels are put into the pond, they should be fed, using chopped @#@254@#@, pig liver, river mussel meat, fish meat, etc. (if @#@261@#@ is available, freshly scalded dead maggots can also be used), and at the same time add the following drugs per 1 kg of fresh feed weight: 10 grams of electrolytic multivitamins, 3 grams of Eel Treasure No. 4, 5 grams of Eel Treasure No. 5; use a special adhesive or a small amount of @#@245@#@ flour to attach the drugs to the feed, and the feeding amount is 0.5% of the yellow eel's body weight; the feed can be placed directly on the aquatic plants, and for cement ponds the feed can also be placed directly in the pond where there are no aquatic plants, and as many feeding points as possible should be set up. On the second morning, use 5 grams of Eel Treasure No. 5 per 1 cubic meter of pond water, mix with water and splash it over the whole pond (box). The above medication method should be carried out continuously for 3 days.