Two different encounters with humpback whales (Megaptera novaeangliae) during our Mexican holiday make up this post. The first experience was breaching humpbacks while in Cabo San Lucas (Baja California Sur) on the Pacific Ocean side. We followed three whales for about an hour and only had them break the surface to breathe. Shortly after this, they got more active and for about 5 minutes and they breached a number of times.
We have over 500 dives and have never encountered humpback whales underwater. In Hawaii, we have heard the males singing during our dives but they always seem to avoid us. All that changed in the Socorro islands (Revillagigedo Archipelago). We had a very brief encounter (about 10 -15 seconds) with a mother and her calf. They were moving toward us but immediately turned away to avoid us, but this allowed for a couple of quick photographs. This was a very surreal experience to see a 13-15 meter (40-50 foot) whale and calf such a short distance from us!
Our previous posts on the Revillagigedo Archipelago, also called the Socorro islands, have included the giant mantas(Manta birostris), whitetip reef sharks(Triaenodon obesus), and silky sharks (Carcharhinus falciformis). Although Galapagos sharks (Carcharhinus galapagensis) are fairly common especially at Roca Partida, we did not have any encounters with them there. However, on one dive we did come across a few juveniles at Socorro island and this gave us an opportunity to photograph this species.
Older sharks of all species have very scarred bodies which are simply a result of surviving in a dangerous ocean environment. However, these juvenile Galapagos sharks, which were about a meter (2-3 feet) in length, had skin with very few blemishes. Adult Galapagos sharks can reach 3 meters (9-10 feet) in length.
The silky shark (Carcharhinus falciformis) gets its name from the smooth texture and silky look of its skin especially when it is young. These sharks can grow to 2.5 meters (8 feet) in length and are very abundant in the Revillagigedo Archipelago. Generally referred to as the Socorro Islands, these volcanic islands lie approximately 390 kilometers (240 miles) off the coast of Cabo San Lucas in Mexico.
Although we encountered scalloped hammerheads, tigers, Galapagos, whitetip reef, and silvertip sharks the most numerous were the silky sharks. At dusk, as the sun was setting, a few of us slipped into the water behind the boat in an attempt to photograph these sharks with the sun’s rays penetrating behind them to give a visually stunning look. Thank you to Andy Murch of Big Fish Expeditions for showing us this technique as we are relatively new to underwater photography.
The focus of our trip was to photograph the giant mantas (Manta birostris) at San Benedicto Island in the Revillagigedo Archipelago. These are the largest mantas in the world and can be more than 20 feet (6 meters) across and weigh up to 3,500 pounds (1600 kilograms). The dive site called “the Boiler” is a cleaning station for these mantas where fish remove parasites from their bodies. Consequently, this site provides the best opportunities to see and photograph these gentle giants.
The Revillagigedo Archipelago lies approximately 390 kilometers (240 miles) off the coast of Cabo San Lucas in Mexico. These Pacific islands are more commonly referred to as the Socorro Islands. Aboard the Southern Sport, we dove 3 of the 4 islands (Roca Partida, San Benedicto, and Socorro).
A color variant from the more common black and white manta is an all black or nearly all black manta. It is not a different species of Manta birostris. However, it is exciting when one showed up as it looks so different.
San Benedicto is the island for the giant mantas. They are used to divers and show no fear of people. They swim It seems a bit surreal, even a few weeks after our encounter with them, to have had huge mantas swim within a few meters of us.
The Revillagigedo Archipelago lies approximately 390 kilometers (240 miles) off the coast of Cabo San Lucas in Mexico. These Pacific islands are more commonly referred to as the Socorro islands. Aboard the Southern Sport, we dove 3 of the 4 islands (Roca Partida, San Benedicto, and Socorro). The whitetip reef shark (Triaenodon obesus) is common here.
The whitetip reef shark rarely exceeds 1.6 meters (5 feet). It is nocturnal and rests during the day under ledges and caves. At Roca Partida, we observed many groups of whitetip reef sharks congregating in groups of 3 to 15 on the ledges. By approaching them slowly we were able to capture this behavior.
These sharks hunt at night and eat mainly crustaceans like crabs, lobsters, and shrimp as well as bony fishes. They tend to hunt in groups. During the day, it was interesting to observe many large lobsters out in the open just a few feet away from the whitetip reef sharks. Apparently, the lobsters know that they are safe from these sharks during the day.