Whenever we run a Cactus to Coral scuba diving trip to San Carlos, the boat ride out to the dive sites is usually filled with chatter about the “big stuff.” Everyone is hoping to get buzzed by a sea lion pup, spot a massive green moray eel free-swimming across the reef, or maybe even catch a glimpse of a passing whale shark.
I get it. The big pelagics are thrilling. But I’ll let you in on a secret that underwater photographers have known for years: the real magic of the Sea of Cortez is hiding in the details.
If you slow down, get your face close to the rocks, and start looking for the little things, San Carlos transforms into a world-class macro diving destination. Here is a field guide to the tiny, weird, and incredibly colorful critters you should be looking for on your next dive south of the border.
The Jewels of the Reef: Nudibranchs
If there is one macro creature that turns divers into absolute fanatics, it’s the nudibranch. These shell-less marine snails (often just called “sea slugs”) look like they were painted by a neon artist. The Sea of Cortez is absolutely packed with them.
Keep your eyes peeled for the Spanish Shawl, which boasts a brilliant purple body covered in fiery orange fringe. You might also spot the vibrant blue and yellow Tambja nudibranchs slowly making their way across the rocky substrate. Because they move at a snail’s pace, they are the perfect, patient models for anyone practicing their underwater photography.
Masters of Disguise: Seahorses
Finding a seahorse is like finding a needle in a haystack, which is exactly why it feels so rewarding. The Pacific Seahorse can be found in San Carlos, but you have to know where to look.
They don’t swim around in the open. Instead, they use their prehensile tails to anchor themselves to gorgonians (sea fans) or chunks of drifting sargassum weed. They are masters of camouflage, often perfectly matching the color and texture of whatever they are holding onto. When you are hovering near a sea fan, take a minute to scan the branches. What looks like a broken twig might just have an eye looking back at you!
The Comedians: Blennies and Jawfish
If fish had personalities, blennies and jawfish would be the stand-up comedians of the Sea of Cortez.
- Signal Blennies: Look for tiny holes in the hard coral or rocks. You will often see a tiny face with big, expressive eyes poking out. Every once in a while, the males will dart out of their holes and flash their massive, colorful dorsal fins to defend their territory or attract a mate.
- Jawfish: Head to the sandy rubble patches at the base of the reef. Jawfish dig vertical burrows in the sand and hover just above them. If you get too close, they dive backward into their holes tail-first. If you are really lucky, you might spot a male carrying hundreds of unhatched eggs inside his mouth!
How to Become a Macro Hunter
Spotting these creatures requires a shift in your diving style. You can’t swim a mile a minute and expect to see a half-inch nudibranch. You have to slow your breathing, move at a crawl, and literally stop to smell the roses (or in this case, the sponges).
More importantly, you need absolute control over your buoyancy. You cannot crash into the reef looking for tiny animals. If you want to get serious about finding the small stuff, taking the SSI Perfect Buoyancy specialty is a must. It teaches you how to hover motionless inches from the bottom without kicking up a cloud of silt and ruining visibility.
Ready to trade the wide-angle view for the macro world? Grab your dive light, pack your bags, and join us on our next San Carlos weekend trip. Let’s go see what’s hiding in the rocks!