How to Tell the Sex of an Oranda Goldfish

1. By their physical appearance:

* Males tend to be larger in size than females.

* Males have a wen (or head growth) that is larger than females.

* Males have "breeding stars," which are white dots that develop on the gill covers during breeding season.

2. By observing their behavior:

* During the breeding season, male Orandas will pursue the females and nudge them with their noses.

* Males may also display aggressive behavior towards other males.

It's worth noting that sex determination in Oranda Goldfish can sometimes be challenging, especially for younger or immature individuals. If you're unsure about the sex of your Oranda Goldfish, it's best to consult with an experienced aquarist or breeder for a more accurate assessment.