Do Crucian Carp Actually Eat Crayfish Fry?

Crucian carp eat crayfish fry. Crucian carp is an omnivorous bottom-dwelling creature, and it will eat crayfish fry and crayfish feed, so it is best not to polyculture crucian carp fry and crayfish fry together. However, if the crucian carp are somewhat larger, they can be polycultured with a small number of crayfish.

Points to note during crucian carp farming:

1. Water quality

Crucian carp is similar to the four major Chinese carps, with low demands on water quality, and it can be raised in ordinary aquaculture ponds; the water only needs to be slightly more fertile than that of a grass carp pond. During the high-temperature farming season from July to September, apply microbial ecological preparations 1-2 times a month (such as Bacillus subtilis, photosynthetic bacteria and other products) to regulate water quality, so as to control harmful indicators in the pond such as ammonia nitrogen and nitrite.

2. Disease prevention and control

The improved Japanese white crucian carp is relatively strong in disease resistance, with fewer explosive diseases, and it is also relatively easy to treat. Therefore, during the farming process it is necessary to do a good job of fish health care management and water quality regulation, so that during the fish disease outbreak season in June-July, fish diseases can also be well prevented.

3. Polyculture

Crucian carp is a bottom-dwelling fish, similar to mud carp and common carp, and ponds used for farming crucian carp generally no longer polyculture mud carp or common carp. Crucian carp is an omnivorous fish, and its feed protein requirement is slightly higher than that of grass carp, so you can choose high-grade grass carp feed or channel catfish polyculture feed for feeding.

4. Density

When farming crucian carp, about one thousand five hundred fish per mu is enough, and the most important thing is still to look at the water depth; if the water is relatively deep, you can farm a few more, and basically at about 2.7 m you can reach 1800 fish, but as the crucian carp also gradually grow, if they grow to a certain size, the farming density needs to be reduced.

It is not recommended to farm crucian carp alone; appropriately stocking other fish species equal to one tenth of the total number of crucian carp is beneficial to the growth of crucian carp. However, for polyculture it is best to choose gentle fish species, and on no account should fierce carnivorous fish such as snakehead be polycultured.