Goldfish
noun
A gold fish is really just gold in color, but it's still called a goldfish.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
これは、金魚ですか？コイですか？
Is this a goldfish? Is it carp?
赤と白の点が入ってる金魚を下さい。
Please give me a goldfish with red and white dots.
川に、金魚はいますか？
Are there any goldfish in the river?