The Cauca Molly has a slender body with shiny scales. Its colors range from silver to yellow. You will notice a dark line that runs from its eye to the base of its tail. It has a short, rounded fin near its belly. This fish is smaller than other mollies, growing up to 2 inches ...
Instead, there are 3 main classes, groups, or types of fish: bony fish (Osteichthyes), jawless fish (Agnatha), and cartilaginous fish (Chondrichthyes). Fish are the most diverse group among vertebrates, with over 33,000 different types of fish species. No one really knows how many different...