Ocean sunfish, also called the common mola, are arguably one of the ocean’s funniest looking fish. Their back fin that they are born with never actually grows, and instead just folds into itself and forms a blunt, flattened structure called the clavus, says National Geographic. This means that sunfish must swim by flapping their dorsal and anal fins side to side, making them sometimes appear to be awkward swimmers.
This is part of a series of posts about our Pacific Hotspots expedition.
California Leg, Day 2
This morning after we passed the barking sea lions on the breakwater at the end of the harbor, we traversed through fog so thick there were no signs of land anywhere to be seen. We pushed trough swells upwards of 6 feet to get to our fist dive site of the day. A mola mola (aka ocean sunfish) we passed along the way didn’t seem to mind the intense swells as it basked on the ocean surface.
After motoring out 20 miles across Monterey Bay (north of the Monterey Canyon), we deployed the ROV at the former California halibut trawl grounds. As a direct result of the work of Oceana, this area has been closed to bottom trawling since 2006.
The seafloor here is primarily soft sediment and ranges in depth from 50-250 feet. The areas were teeming with signs of life, including burrows, tracks, and holes. Some places had a lot of juvenile fish and crabs suggesting these areas may be a nursery ground for fishery species. Overall, we were surprised by the diversity of habitat formations and creatures.
As promised, I'll be bringing you regular updates from the Ranger expedition to the Canary Islands. Here's one from last weekend. -Emily Almerimar-Chipiona Voyage. Saturday, August 15, 2009 By Silvia Garcia Sunny, calm during the morning, and strong gusts of wind in the Strait. Last night we left Almerimar bound for Chipiona which will take us about 30 hours of sailing. Going through the Strait has entailed sailing with the sails up because of the gusts of wind we have come across after coming from a completely calm Alboran Sea. Of course, in the Strait, we have sighted numerous cetaceans, normally family groups, of both long-finned pilot whales and common dolphins and striped dolphins; a mixed group of common and striped dolphins swam alongside the ship’s bow for quite awhile. On several occasions there were some babies and juveniles in these groups. We also came across a huge ocean sunfish (Mola mola) sunning, and a good-sized patch of sargasso (Sargassum vulgare) adrift, uprooted from the ocean bottom by a storm or aggressive fishing gear.