Final answer:
Tiger sharks are most commonly found in nearshore tropical and subtropical waters. Accurate population graphs are challenging to present without specific data, but it is known that overfishing and bycatch have caused significant declines in shark populations worldwide.
Step-by-step explanation:
Tiger sharks, not to be confused with sand tiger sharks (Carcharias taurus) which are a different species, are commonly found in tropical and subtropical waters around the world. They tend to inhabit areas close to the coast, including bays, estuaries, and coral reefs but are also known to travel into the open sea. The population of tiger sharks, as well as other shark species, has been severely affected by overfishing and bycatch in commercial fishing, it is difficult to accurately graph the population without specific data. Shark populations worldwide have seen declines, sometimes by as much as 90% in certain regions, predominantly due to the demand for shark fins and other factors like habitat destruction and pollution.