How To Tell The Different Genders Between Goldfish. Although not all fish can be easily identified by sex, these tips will help you recognize the sex of many of the. Advertisement a female oranda goldfish lays up to 10,000 eggs during a spawning session lasting several hours.
However, male goldfish often chase one another, so you must be completely certain the test fish is female before using this method. They also tend to be more brightly coloured and will often swim faster than their male counterparts. It also has a thinner, more streamlined body shape than the female.