I caught it in the park. What kind of fish is this?

This is goby, a fierce benthic fish. Habitat in rivers, lakes and streams, riverside beaches, gravel areas, reservoirs and ponds are produced. Feed on aquatic insects, shrimp, fish eggs and young fish. And aquatic annelids and algae. It may be difficult to train to eat artificial feed in fish tanks by feeding fresh bait such as red worms. You can try to domesticate slowly by eating submerged food. It is suggested to put more stones and other evasive objects in Tanqueray, which will rob the territory and fight.