Fish are aquatic, water-dwelling creatures that use their gills to breathe, Fish come in a variety of forms, dimensions, and hues. They range in size from microscopic species like the Paedocypris progenetica, which is just a few millimetres long, to enormous species like the whale shark, which may reach lengths of up to forty feet. Fish species that are frequently consumed include bass, trout, salmon, tuna, cod, and catfish. Fish have developed a variety of aquatic adaptations. Fishtopic Blog