Here are some clues that might help you sort out the Goldfish boys from the Goldfish girls: * The female Goldfish are slightly bigger than the males and look even heavier in the abdomen when they are full of eggs. * Male Goldfish develop white spots on their gills and pectoral called "breeding tubercles" during spawning time. * Males have midline ridges on their undersides beginning from the back of their pelvic fins and ending at their vent opening. This feature can be absent or smaller in females. * Males have firm abdomen while in females; the area between the pelvic fins and the anal fins is more pliable. * Male Goldfish have longer and pointed pectorals as well as stiff fin ray, while females have more rounded pectorals and shorter, finer front fin rays. * M
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