Change the water in the fish pond! Goldfish during their breeding season are very dirty! #fish #koi

This is the gonad of the female fish in the breeding period #fishing #koi #fish

The female fish has spawned! A complete water change is necessary to maintain clear water! #goldfish

Pearl goldfish! Is there anyone who likes it? #fish #koi #aquarium

The goldfish is about to change color! Let's wait and see! #fish #koi #goldfish

The young goldfish fry are very robust and vibrant! #fish #koi #freshwater #aquarium