Bimini Island in the Bahamas is where these photographs were taken. It is a small island 80 km (50 miles) from the Florida coast and has a large variety of shark species. On this trip, we also encountered great hammerheads, nurse, blacknose, blacktip, and bull sharks. They are commonly found in shallow water around coral reefs.
Caribbean reef sharks (Carcharhinus perezii) are the most common requiem shark species encountered by divers in the Caribbean sea. They also inhabit parts of the Western Atlantic ocean. If you dive in the Caribbean you may encounter this shark as it is relatively common.
Most of the baited shark dives involve the Caribbean reef shark. This is often the first “shark dive” new divers will take part in and it can be thrilling. We did this years ago with our kids and I must say we were nervous and our adrenaline was sure flowing. However, this made us fall in love with sharks when we realized just how majestic they were. This surreal experience led us to pursue our “shark hobby” and we have been photographing them ever since.
They average about 1.5 to 2 meters (5-7 feet) in length but can reach lengths of about 3 meters (9 feet). They often hang out around Caribbean reefs and it is likely the largest shark you will encounter while reef diving. Their diet consists of a variety of fish, octopus and small rays.
Caribbean reef sharks can evert their stomachs which means the stomach is turned inside out. This is helpful to discard undigested food and plastic. Unfortunately, our oceans are now full of discarded plastic from human consumption. These plastics are often ingested by marine organisms and are responsible for many needless deaths.
Scuba diving in the dark is always an adrenaline rush because you know that there are sharks near you but you can’t see them until they suddenly appear. We love night dives because they add an entirely new dimension to exploring the underwater world. We photographed these great hammerhead sharks around Bimini Island in the Bahamas.
Sharks are very comfortable swimming in the water at night. To simplify, their eyes are designed to allow light to pass through the retina twice which enables sharks to see in the dark. It is believed that sharks can see about ten times greater than humans in clear water.
They also have a cephalofoil (the hammer) that is full of electrical sensors. These electroreceptors are interconnected jelly-filled pores called ampullae of Lorenzini and aid in hunting as these sensors pick up electrical signals given off by all living creatures including humans. Therefore, a shark at night is very aware of your presence and location in the ocean even though you have no idea where they are.
Most divers encounter southern stingrays (Dasyatis americana) buried in the sandy bottom during a dive in the open ocean. During our time on Bimini island in the Bahamas, we decided to snorkel around the shallow mangroves in search of juvenile lemon sharks. Mangroves are critical environments for juvenile fish and sharks because it acts as a nursery for many species. Protected from the predators in the open ocean these shallow waters with their massive root systems provide protection.
We didn’t find any sharks but we were surprised to see so many southern stingrays around the shallow mangroves. There is a relatively large population of great hammerhead sharks that inhabit these waters at this time of year. Because the main predator of these rays is the great hammerhead shark we wondered if they modified their behavior at this time of year to try to avoid these sharks.