The difference between grass carp and brocade carp

Carp usually inhabit the bottom of rivers, lakes, reservoirs, ponds and marshes, and there are many kinds of carp, among which koi is an ornamental fish, which is easy to be confused with grass carp. So, what's the difference between grass carp and brocade carp?

What is the difference between grass carp and brocade carp?

1. Figure: grass carp is lanky, with dorsal fins at the back, while koi is chubby and with dorsal fins at the front.

2 colors: grass carp have more colors, including black, gray, orange, gold and flower colors, while koi are mainly red and white.

3. Beard: koi has a beard, while grass carp has no beard.

Second, how to raise koi?

1. Dechlorination of aquaculture water

In general, tap water is the most commonly used body of water in koi culture, but few people raise brocade carp in river water, well water and spring water. However, no matter what kind of water quality, there is a certain amount of chlorine. Therefore, dechlorination is carried out before use. There are generally two methods: the first chemical dechlorination method: putting an appropriate amount of sodium thiosulfide into water and reacting with chlorine to form harmless sodium salts. The second method of physical chlorine removal: if the water is exposed to the sun for two or three days, it can also be inflated into the water to "drive away" the chlorine.

2. Water quality objectives

The water for fish culture must be colorless, transparent and free of turbidity; in terms of temperature, the best temperature should be 22: 28 ℃, and the difference should not exceed 2 ℃ as far as possible, otherwise it will directly endanger the health of koi; when the normal dissolved oxygen content reaches 5~7mg/L, it is more suitable for koi culture; koi is suitable for growing in weakly alkaline water, so the alkalinity is about 6: 8.5 is normal. The content of ammonia and nitrogen in water must not exceed 0.1mg/L, otherwise it will threaten the health of koi, ammonia nitrogen and other chemicals are harmful to aquatic organisms, too high content will directly lead to the death of koi.

3. Bait and feeding

In the selection of bait, it is generally divided into natural: bait red worms, earthworms, bread worms, etc.; artificial baits: breeding materials, germ families and Seyang materials, and so on. When feeding, it is best to follow the "four principles": timing, fixed point, fixed quality, quantitative, and develop good eating habits.

4. Feeding and management

Culture density: the breeding density of koi is also required. For example, the density of water cluster tanks is generally 60 cubic centimeters × 30 cubic centimeters × 15 cubic centimeters. Such aquariums can raise 6 koi with a body length of 15 centimeters to 20 centimeters. 90 cubic centimeters × 30 cubic centimeters × 50 cubic centimeters can be stocked with 8 tails. 110 cubic centimeters × 30 cubic centimeters × 50 cubic centimeters can be stocked with 10 tails.

Timely examination: if the feces of koi become white gelatinous, it is a dangerous signal of intestinal mucosal exfoliation, and gastrointestinal perforation will occur if not treated immediately. When koi has indigestion, fish droppings with a lighter specific gravity will appear on the surface of the pond water and stop eating immediately for observation.

In addition, when breeding koi, it is necessary to clean up their excreta and clean the fish tank in time. If it is a fully automatic fish tank, it is equipped with a cleaning system to change the cotton filter or clean it once a month.