Technical exchange on grass carp farming and forage grass cultivation

Among the Four Major Chinese Carps, grass carp has good economic returns, and everyone likes to farm them. Everyone knows perfectly well that grass carp eat grass. In the past, when farmer uncles raised grass carp, they cut grass themselves, but now there is hardly any grass to cut. If you farm grass carp on a large scale, there won't be that much grass, so you have to grow forage grass yourself to feed the fish. That way, the fish eat grass and are a bit more eco-friendly and tasty. Today let's discuss forage grass cultivation. This is purely an exchange; you can criticize, but no bragging.

I. Popular science: forage grasses that grass carp like to eat:

There are many varieties of green feed for fish, including ryegrass, Dongmu 70, sudangrass, barnyardgrass, foxtail millet grass, hybrid napiergrass, alfalfa, white clover, red clover, bitter lettuce, etc.; corn, pumpkin, sweet potato; water hyacinth, duckweed, watermeal, etc.; elodea, eelgrass, hydrilla, artemisia, etc.; water spinach, water cress, alligator weed, etc.

Friendly reminder:

You should, based on local actual conditions such as sunlight, rainfall, fertilizer sources, soil conditions and aquaculture species, select several green feed varieties suited to local conditions and form a reasonable planting and utilization model. Combine land and water: use pond embankments and pond slopes to grow terrestrial feed, and use abandoned ditches and ponds, intake and drainage channels, and shrimp and crab culture water surfaces to grow aquatic green feed, so as to achieve "using ponds to support ponds and using water to support water."

II. Scientific forage grass cultivation:

1. Use three varieties suited to local conditions to achieve the goal of supplying green feed year-round;

2. Determine how much area of forage grass needs to be planted. For example, for 0.067 hectares (one mu) to produce about 500 kg of fresh fish, 4000-5000 kg of green feed is needed for the whole year, requiring about 0.034 hectares of green feed land.

3. The proportion of forage grasses and the crop rotation technique. For example, if you choose legumes such as clover (red clover, white clover, alfalfa, etc.), grasses such as ryegrass (Dongmu 70, Italian ryegrass, etc.) and hybrid napiergrass (or sudangrass, etc.) for mixed planting, you can achieve year-round green feed supply.

4、Succession between the earlier and later varieties. For example: Clover: sow around early September, drill in rows 25-35 cm apart, seeding rate 0.5-1 kg per 0.067 hectares. On land that has never grown clover, inoculate with rhizobia at sowing. Ryegrass: sow around early September, drill in rows on part of the land intended for hybrid napiergrass, with row spacing of 30 cm and seeding rate of 1.5 kg per 0.067 hectares. Hybrid napiergrass: transplant in two batches. The first transplanting is in mid-to-late April, with sufficient base fertilizer applied before transplanting; the second transplanting is at the end of May, after the last cutting and use of the ryegrass. The transplanting rate per 0.067 hectares is 2000 plants for the first transplanting and 2500 plants for the second transplanting.

5. For the polyculture structure, you should choose a stocking model based mainly on herbivorous fish such as grass carp, bream and Wuchang bream, with their stocking amount accounting for more than 50% of the total weight of fish fingerlings, and polyculture about 35% filter-feeding fish such as silver carp and bighead carp and about 15% omnivorous fish such as carp and crucian carp. In this way, green feed can be used to directly feed the herbivorous fish; the leftover bait, plant debris and humus they consume can provide feed for the omnivorous fish.

III. Conclusion:

Fish farmers are welcome to comment on the techniques, avoid risks, and get rich.