Black catfish is grass carp.

Black grass carp is also called black grass carp and is somewhat aggressive. Inhabits lagoons and coastal reefs to over 25 meters. Inhabits sandy or weedy bottoms. Usually seen alone but often in close proximity.

Physical characteristics: up to 40 (cm). Black markings from behind the eyes with black fleshy stalk spots larger than eye size. A gray-white area at the end of the black stripe on the second dorsal fin and a dark basal stripe distinguish it from the similar P. barberinus.

Extended information

The origin of grass carp:

Like carp, grass carp also estrus and reproduces in spring when the temperature is unstable (basically terrestrial aquatic animals So), it's just that the catfish must be in oxygen-rich and pollution-free turbulent waters to induce the gonad development of male and female fish. In ordinary fish ponds and cages, the gonads of silver carp (silver carp) will never develop, including silver carp, silver carp (bighead carp), and black carp (black carp).

At the current nursery and breeding station, both male and female broodstock fish such as catfish are raised in artificial oxygen-rich flowing water to promote the development of gonads (ovaries and seminal vesicles). When the weather warms up in spring, it is expected that the gonads of both male and female fish will be basically the same. After maturation, oxytocin is injected into the female fish's brain one week to half a month in advance to promote the full maturation and ovulation of the female fish's eggs (the male fish will be affected by the female fish's sexual information and go into estrus synchronously).

When it is found that male and female broodstock are chasing after each other in estrus in a flowing water body, immediately put in a large amount of high-temperature sterilized brown silk or hay. After the male and female fish cooperate with each other to ovulate and ejaculate, a large number of fertilized eggs will be produced. It can adhere to brown silk or grass.

Catch the broodstock that has drained all the eggs and semen out of the spawning pool... Immediately drain the pool water that has become strong-smelling and contaminated with semen and egg liquids, and treat it with malachite green or potassium permanganate. After disinfecting the fertilized eggs with the solution, immediately replace them with clean incubation water of the same temperature... Maintain the optimal incubation temperature of 20 or 22 degrees, increase artificial light, and increase oxygenation of the water. It only takes 3-4 days for the fry to break out of their shells.

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