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1. The percentage of production of phytoplankton, bacteria, and zooplankton in ponds that were not fertilized with fertilization and artificial feeding and fertilization was 98.7, 94.9, and 97.9, respectively.
2. Professor He Zhihui from Dalian Fisheries University determined that 99.8% of the total amount of bait was found in phytoplankton, bacteria, and zooplankton in fish ponds in the aquaculture base of the school. Natural food biological productivity 4.5g/M2 days. (1989)
two. The appropriate specification of stocking size and gain multiples for stocking of fish should be based on the climate characteristics of each region and the length of the fish growth period, the fish growth pattern, the specifications of the planned fish out of the stock, the stocking density and the planned yield; Rotation, whether or not to raise large fish species and other factors. Comprehensively consider the weight gain of farmed fish.
1. The weight gain multiples of the year of the fish: carp 100 ~ 11398; carp 753 ~ 2126; carp 213 ~ 1950; tilapia 25 ~ 227; white peony 1048 ~ 1551;
2. Weight gain multiples of Erling fish: 25 to 96 fish species weighing 15 to 40 grams of carp; 9 to 34 fish species weighing 50 to 100 grams; 10 fish species weighing 10 to 20 grams of carp and carp ~38.5; fingerlings weighing 75 to 100 grams were 7 to 12.6; fingerlings weighing 200 to 250 grams were caught in the year 2.3 to 6.8.
three. Stocking species and pond fish stocks Pond natural food organisms provide fish production such as earthworms and other filter-feeding (water fish) fish, with a high limit of about 400 kg. The significant increase in fish production should be based on increasing the stocking ratio of fish (eat fish), improving feed quality, and strengthening oxygenation measures.
1. Carp: carp storage 300kg/mu or more, the optimum proportion of carp is 4 to 5:1; carp storage 200kg/mu or more, the optimum proportion of carp is 3:1; carp storage The amount of 100 ~ 150kg / mu more than the best ratio of 2:1.
2. Mandarin fish, tilapia, and white gizzards: Their polyculture ratio depends on their ability to filter and feed, and their ability to filter foods is stronger than that of tilapia and white gizzards. However, the eel's ability to swallow is less than that of the latter. Therefore, the stocking ratio of tilapia and silver carp should be lower than that of alfalfa, otherwise it will inhibit the growth of carp. The ratio of stocking for tilapia, tilapia, and silverfish is 2 to 3:1.
3. Grass carp and squid: These two fishes have different diets and habitats. The natural food used in the pond is also different, but the ability of the grass carp to eat more is higher than that of the carp when feeding artificial bait. Therefore, the carp can be kept less in the main grass carp pond in order to make full use of benthic organisms and artificial baits. The main carp pond usually does not contain grass carp. In ponds with aquatic plants, depending on the number of acres of aquatic plants, about 20 to 50 grass carp weights weigh about 100 grams to control aquatic grasses. The main grass carp ponds, depending on the amount of grass adult fish, can stock 50 to 100 tail carp species.
4. Herring and squid: They both inhabit the bottom and have some overlap in their diet. In the pond where the main herring is reared, only a small amount of carp species can be placed, with no more than 50 per mu. The pond that raises the eel generally does not place herring.
5. Squid and mackerel: There is also overlap in the feeding habits of the two fish. They compete for large zooplankton in the same pond. Therefore, less carp is placed in the main carp pond to effectively use small zooplankton and control rotifers. Biomass to avoid causing hypoxia. However, the amount of carp stocks can only be controlled by one-third of the carp, otherwise it will inhibit the growth of carp. Soviet scholars (Харчтонова, 1980) pointed out that 50% of artificial diets and 50% of natural diets are the fastest growing. This also shows that the main squid pond should not overstock squid.
four. Stocking species and density In general, stocking density is positively correlated with fish yield in a certain range; it is negatively correlated with the out-of-water specification. When the stocking density exceeds this range, both the fish production and the out-of-water specification decrease.
1. Squid: The stocking density of common carp summer flowers is generally 500 to 600 (mixed yield per mu up to 400 to 500 kg). The stocking density of anchovy springs is about 500 per acre (up to 700-800 kilograms per mu). When the pond conditions are good, the feed quality is high, and the oxygen enrichment equipment is perfect, the stocking capacity of mu can reach 1000 to 1500 (mixedly raising per mu production can reach 1300 to 2000 kg).
2. Grass carp: The stocking density of grass carp depends on the planned yield, generally adopting large, medium and small polyculture (large grass grass species 500 to 700 g/tail, medium size 150 to 250 g/tail, small size 20 to 50 g/mu ). Such as mixed production of 900-1000 kilograms per mu, stocking large-scale grass species of 80 to 100 tails; medium specification 120 tails; 200 small specifications.
3. The stocking density of eel is about 240 to 350. The proportion of squid depends on the size of the squid. Generally, squid has a larger size and can be put in more suitable. The percentage is controlled from 10% to 15%. However, it should not exceed 20%. The main carp pond is mainly fertilized. The carp only feeds on natural food. Its mu yield can reach 113-417 kilograms. More than 300 kilograms or more, most use round catch.
one. In addition to conventional requirements for stocking types and natural foods, in principle, the natural food biomass in the pond should be fully utilized by the breeding organisms.