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How big can the orchid koi fish grow?
Koi fish can grow to1-1.5m. ..

If raised in a small fish tank, it can only grow to two or three inches because of the limited space for activities; If you want it to grow big, you should keep it in a big fish tank or an outdoor pond. They will soon grow to 30 centimeters or more.

How does koi fish tell the difference between male and female?

1, depending on body type: abdominal hypertrophy is female; The slender figure is male.

2, look at the anus: the anus is wide and flat; The man with small anal invagination is a man.

3. Look at idolization: When the male is about to expel sperm, a reproductive tumor will grow on his head and pectoral fin, which is idolization. In the breeding season, all those who are not worshipped are females; Idolization is a hero. When a mature male fish gently presses his abdomen, white semen will flow out.

4. Touch the fins: the male fish with rough horny protrusions; Smooth is a female fish.