Sexing fishes are one of the most common things people ask fish keepers. Many would want to purchase a male and a female fish.
So, how do you tell the difference between a male and a female fish? In general, male fishes tend to have longer or more elaborate finnage and more intense colouration. Females tend to be bigger and more rotund in order to carry their eggs. Some species such as the live-bearing guppies, mollies, platies and half-beaks have their anal fins modified from the fan shapes (seen in females) to elongate tubes known as a gonopodium. Sharks and rays have similar long appendages known as claspers.
