Analyze the type of fish polyculture
In the same body of water, different types of fish of the same age and different ages of the same species, with different habitat habits and different feeding habits, are the characteristics and the core of the Chinese pond fish culture technology. Polyculture fish should be habit-related, with similar requirements for water quality and water temperature (in the growing season). The ideal fish for polyculture include squid, squid (upper fish), grass carp, squid (middle squid), squid, squid, squid, and herring (bottom fish).
The polyculture of fishes that inhabit different water layers can make full use of water space. Compared with monoculture, the density of released fish can be greatly increased. The excrement of grass carp and herring is not only a fertilizer for culturing plankton, but also a large amount of organic detritus and a breeding group of bacteria for feeding squid and quail. The larvae, pupa and pupa can remove residual baits and improve water quality. Both the full use of water, increase the benefits of production, but also re-use of feed and improve water quality. The polyculture of fish of the same age and different specifications also provides conditions for batch fishing and balanced listing in one production season, while at the same time breeding large-scale species for the next year.
The polyculture of fish should be the primary and secondary points, and the main fish is the main object of feeding and management. The fish is used to fully utilize the water and the bait for reuse.
There are mainly three types of polyculture in pond fish farming.
Grass carp and alfalfa-based polyculture type
The most common type. It is characterized by a wide source of feed, fertilizer, low cost, high yield and economic benefits. Grass carp stocking specifications are 10 grams, 50 grams and 150-500 grams. The stocking specifications for alfalfa are summer flowers, 50 grams, 200-350 grams; and the stocking weight is about 45% and 30% of the total stocking amount (about 150 kg) respectively. At the same time, mixed-breed oysters, head squid, squid and so on. In high-yield areas, net production per hectare can reach about 11 250 kg. Among them, grass carp and grasshopper each account for 30%. The market-standard grass carp is 1.5 to 2 kg and the carp is about 600 g. There are also a large number of 150 to 500 grams of large-sized fingerlings.
The type of polyculture based on é²¢ and é³™
The weight of pupa and pupa stocking accounts for about 60% of the total stocking amount (about 135 kg), and the ratio of pupa and pupa is roughly 3 to 5:1. At the same time, the grass carp, carp, carp, and tilapia are mixed. The market specifications for oysters and oysters are more than 500 grams, and the net output per hectare can reach about 7,500 kilograms.
The main type of polyculture
One is that the stocking size is 50-100 g, and the stocking volume is 50%-65% of the total stocking capacity (about 100 kg). At the same time, they will be mixed with grass carp, cockroach and cockroach About 500 grams of market specifications, high-yield net production per hectare of up to 7500 ~ 8250 kilograms, wolfberry accounted for 50% to 60%. The other species is 85% to 90% of total weight (about 190 kg). Feeding high-protein (35% or so) feeds with full price at regular, quantitative, and fixed-point rates, the net output per hectare can reach 15,000 kg, while wolfberry accounts for about 85%, and the market size is about 500 grams.
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