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How to tell if your goldfish is an adult
Identify what type of goldfish you have.
Different types of goldfish have different characteristics. Understanding what breed you have can help you determine the proper adult coloring and growth for your fish.

Pick from: --You should be able to tell which breed is a male and which is a female. Luckily, a selection of goldfish breed personalities is available online. --Look for goldfish with different features that will help you decide the proper adult color for your goldfish. Some goldfish features you will see in your school are the' red-caps' (sea dragon quill), mermaid-like gills, and fin features. --If your goldfish is metallic yellow or orange with white markings, it may be a common or comet goldfish. These are marked by their sharp, forked tail. --Goldfish can be red, orange, yellow, or copper colored. This can range from bright white with a violet-tint to gray.
Answer:
If your goldfish is metallic yellow or orange with white markings, it may be a common or comet goldfish. These are marked by their sharp, forked tail.