One way is to look at the claspers. Claspers are modified pelvic fins that are found on male sharks. They are used to transfer sperm to the female during reproduction. Claspers are typically located on the underside of the shark, near the tail.
Another way to identify the gender of a shark is to look at the coloration. Some shark species have different coloration patterns depending on their gender. For example, male blue sharks have a more bluish coloration than female blue sharks.
Finally, the gender of a shark can also be determined by its size. In some shark species, the males are larger than the females. For example, male great white sharks are typically larger than female great white sharks.
However, it is important to note that not all shark species have these same characteristics. Some shark species may have different ways of determining their gender. Therefore, it is always best to consult with an expert if you are trying to identify the gender of a shark.