Stepping on to dry land for a moment, there are other predators besides sharks that are being threatened. Tigers are certainly in that category - there are less than 5,000 tigers left in the wild. Much like the shark fishing/finning industry, there is a clandestine black market industry that feeds an Asian market for tiger parts - a market with a long cultural history, but one that can be changed with continued vigilance.
The future of the tiger rests in the efforts of governments to prohibit and enforce against illegal poaching, for international cooperation in curtailing illegal trafficking, and for conservation organizations to continue their efforts to educate the public to curtail demand. One of the great dilemmas faced by many endangered animals like tigers, mountain gorillas, and sharks is that as their numbers become more scarce their black market value increases, making the poacher more embolden and willing to defy the law.
WildAid is one of the leading organizations dedicated to ending the trade in endangered animals. They have an excellent video that covers the issue regarding tigers. Take a look.
Tigers, like sharks, are both beautiful predators and vital to the health of the ecosystems within which they live. Support WildAid's efforts to curb the tiger trade.