Distinguish Between Male and Female gold fish

Generally the females are slightly bigger then males.They have bigger stomach and believed to have small fins as compared to males.The most important difference is that males develop white spot on their gills and pecotals during the time of spawning know as breeding tubcles.Males have firm abdomen while in females area between pelvic fin and anal fin is more pliable.Males goldfish have long and pointed pectoral as well as stiff fin ray while females have more rounded pectorals and shorter ,finer front fin ray.Male goldfish have smaller and more oval anal opening while females have larger and rounder anal opening and males have less thicker anal fins and it is generally observed that males chases females.I hope this information is helpful for you.By time and experience you may also become expert in distinguishing them.