How know the baby goldfish is male or female?

Male goldfish tend to have a more streamlined body, with a narrower head and a slimmer body. Females, on the other hand, have a rounder body and a shorter, wider head.

2. Fins

Male goldfish typically have longer, more pointed fins than females. The pectoral fins (the fins located on the sides of the body) of males are often longer than the pelvic fins (the fins located on the underside of the body). In females, the pectoral and pelvic fins are about the same length.

3. Vent

The vent is a small opening located on the underside of the fish, near the tail. In male goldfish, the vent is usually smaller and more pointed than in females. In females, the vent is larger and more rounded.

4. Breeding Behavior

During the breeding season, male goldfish will chase female goldfish and try to nudge them into spawning. Females will release their eggs, which the males will then fertilize. If you observe this behavior, it is a clear indication that the goldfish are male and female.

5. Size

Female goldfish tend to be larger than males. This is because females need to store more eggs, which requires more space.

6. Coloration

Male goldfish are often brighter in color than females. This is because males use their coloration to attract females during the breeding season.

It's important to note that these are general guidelines and there may be some variation between individual goldfish. If you are still unsure about the sex of your goldfish, it is best to consult with an expert.