You can tell if a fish is healthy by observing its behavior, appearance, and environment. Healthy fish are active, swimming around the tank or pond, have clear eyes, vibrant colors, and intact fins. They also have a good appetite and are not showing any signs of distress or disease. It is important to regularly monitor water quality parameters to ensure a suitable environment for the fish to thrive. Consulting with a veterinarian specializing in aquatic animals can also help in assessing the health of fish.
