Over the last six months of traveling, Grace and I have had the privilege of scuba diving or snorkeling at more than 25 different sites across the USA, South Africa, Seychelles, Vietnam and Thailand. While we’ve seen beautiful reefs and marine life, we’ve also noticed an alarming trend - especially in Southeast Asia - that’s hard to ignore. Shark sightings are becoming more and more rare. And, when they do happen, they are often in low numbers.
We are always excitedly on the lookout for new and different animals in their natural habitats. This is especially true when we dive and our absolute favorite animal to see has always been sharks. In the last six months, we've been lucky enough to spot nurse sharks in Florida, a few white tips in the Seychelles, Great Whites in South Africa and a grey reef shark as well as a leopard shark in Thailand.
While we’ve had these experiences, they are notably few and far between. You would probably be surprised to hear that the most sharks we’ve seen in the last six months have been in tanks at fish markets in Vietnam.
While on a liveaboard in the Andaman Sea off the west coast of Thailand, we talked to our divemasters about this topic. They said that sharks were not always so scarce on the reefs but unfortunately, illegal finning has begun to take its toll on the diversity and quantity of sharks in the area. As an aside, sharks are primarily caught for their fins for use in shark fin soup, a delicacy in parts of Asia. The fins are cut off and the sharks are thrown back into the sea, often still alive. While we had never seen shark fin soup for sale before, we've now seen it on several restaurant menus in Asia and most recently being offered by food vendors at Chinese New Year festivities in Singapore.
Now, I assume finning is not news to anyone who watches Shark Week or has visited an aquarium in recent years. We certainly knew about it before traveling to Asia. But to see the absence of sharks firsthand on an otherwise healthy reef is a wake-up call. Shark overfishing is not becoming a problem, it has been one for quite some time.
As large as the ocean is, it is not large enough for the sharks to hide.
Because Grace and I are interested in this topic and still plan to dive in the Philippines, Australia, Indonesia and Hawaii on this trip, we wanted to learn more. The research about shark populations and the things that threaten them is expansive and varies based on location, species and legislation. Although it seems unanimously agreed upon that most shark species populations are on the decline, some, such as oceanic white tips, thresher sharks and hammerheads, are disappearing at a much faster rate than others.
In order to understand a bit more, I poked around scientific journals and pulled some information from an article called Global catches, exploitation rates, and rebuilding options for sharks. Below are a couple of facts that really got my attention.
A conservative number of sharks killed a year is 100 million but could be as high as 273 million.
Between 6.4% and 7.9% of sharks of all species are killed annually. Anything over 4.9% is beyond their rebound rate and poses a serious risk to shark sustainability.
Another way researchers are measuring the impact humans have had on the shark population is by studying data from fishery logbooks over time. While the sharks are not targeted by the fisheries, longline hooks catch many sharks who attempt to eat either the bait on the hook or the captured prey. Each fishing boat records the number and species of the sharks they catch, and these numbers give an ongoing estimate of the abundance of each shark species in the region. Of eight shark species studied in the last 15 years, they have seen declines between 50 and 89 percent.
While these numbers might seem depressing, the issue is not out of our hands. There are hundreds of organizations out there dedicated to helping sharks. There is also a record amount of awareness and global legislation to help protect sharks. Scientists have also seen certain populations of shark species, such as the great white, begin to rebound after a concerted global effort.
The issue will remain a complicated one, especially if we begin to factor in things like global warming, pollution, and overpopulation. But if you are interested in learning more about how you can help, check out Discovery Channel's website called Sharkopedia, which has a section completely dedicated to Shark Conservation.
I think as people, we feel the need to protect what we are most connected to. In my opinion, the best way to get involved is to get out there and explore the world’s oceans for yourself. Some of my greatest and most unforgettable moments have been up close shark encounters. Hopefully, with time and effort, we won’t have to be the last generation able to experience these amazing animals in their natural habitat.