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The Manta Divers Blog: Cancun Diving and Snorkeling, Explained by Locals

The Manta Divers Blog: Cancun Diving and Snorkeling, Explained by Locals

Welcome to the Manta Divers blog, written by the PADI 5 Star team that dives Cancun every single day. This is where we answer the questions guests actually ask us on the boat: what lives on the reef, how the MUSA underwater museum really looks from the surface, when whale shark season runs, what a cenote cavern dive feels like, and how to pick between snorkeling, Discover Scuba, and a full PADI certification. No recycled travel filler, just honest local knowledge from the crew in the water.

Our guides cover every side of diving and snorkeling in Cancun and Isla Mujeres. Marine life articles help you identify the turtles, rays, sharks, and reef fish you will meet, and explain which ones are actually dangerous (almost none). Seasonal guides break down the best time to dive Cancun, from summer whale sharks to winter bull sharks, along with wind, visibility, and what a marine forecast really means for your trip. Training articles walk you through PADI courses from your first breath underwater to Rescue Diver and beyond, and our equipment guides cover what to rent, what to buy, and how to pack for the Caribbean.

If you are planning a trip, start with the topic that fits your week: scuba diving, snorkeling, cenotes, sea life, or seasonal Cancun. Every article connects to the real tours and courses we run, so when something catches your imagination, you are one click from making it happen. New guides are published every week, so check back, or just ask us. We are divers first, and we love talking about this stuff.

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Reef fish identification Cancun - Some marine life favorites & how to identify them Vol 1

  • Writer: Manta Divers Team
    Manta Divers Team
  • Sep 12, 2021
  • 4 min read

Updated: Jul 30

Scuba diving and snorkeling introduce you to a world full of weird and wonderful inhabitants. You will see a variety of creatures dazzling the reef, and usually one stands out. You cannot wait to surface and tell your dive buddies about it. Along the way you will get to know the everyday Cancun fish you are most likely to meet, the fish of Cancun that give our reefs their color, and how to tell them apart.

After the dive, you ask, “Wow, guys, did you see that yellow fish?”…Ummmm. Perhaps it is time to brush up on your identification skills. Please dive in to reef fish identification Cancun

The Manta Team is fortunate enough to explore the Mesoamerican Reef every day. In this blog, we share a small selection of marine life we see all the time, along with simple features you can use to identify them on your next dive or snorkel with us.

Want to get in the water soon?


Angelfish

Angelfish are often easy to spot once you know what to look for. Most have disk-shaped bodies and small mouths, and they cruise the reef with that confident, slow finning style.

Grey Angelfish are commonly seen around the reef, sometimes swimming in pairs. Do not confuse them with the French Angelfish, which can look similar at first glance, but usually show stronger yellow markings across the face and body.

Tip: if you are unsure, look closely at the face pattern and how much yellow is present.

Grey Angel Fish
Grey Angelfish

Grunts

Grunts often congregate in large groups, hovering around coral heads and reef structure. Their shape is usually easy to recognize: sloping heads and tapered bodies.

Here are three common ones you will see:

  • French Grunt: yellow stripes over a blue-white background

  • Smallmouth Grunt: elongated body, yellow tail, and 5 to 6 yellow stripes

  • White Grunt: stripes mainly on the head, plus a checkered pattern of yellow and bluish silver

Fun fish ID trick: if you see a cluster of similar fish, pick one feature and lock onto it first, like stripe location, tail color, or body thickness. Then compare the rest.

School of Grunts
French, small-mouth, and white grunts are all pictured here. Can you distinguish between these species?

Damselfish

If it is small and feisty, it might be a damsel. Damselfish have small, oval-shaped bodies and tend to dart back and forth over the reef like they own the place.

Two common ones in our area:

  • Bicolor Damselfish: the body has two distinct colors

  • Yellowtail Damselfish: similar body shape, but with a bright yellow tail, darker body, and electric blue spotting

Tip: damsels often hang over one patch of reef and defend it. If a tiny fish is acting like a bouncer, you are probably looking at a damselfish.


Damselfish with elk horn coral
A bicolored damselfish, protecting the reef

Sergeant Major

Sergeant majors are a snorkeler favorite because they often swim mid-water in groups.

How to identify them:

  • yellow and blue body

  • five black vertical bars

Fun fact: male sergeant majors can turn darker blue or purple when courting or guarding eggs, and they may act more aggressive during that time.

Sargent Major fish in the reef
Sergeant Majors

Next up we have some "odd-shaped swimmers"


The Smooth Trunkfish

Dark with white spots, honeycomb markings on the center of the body. You'll see them blowing water jets into the sand, searching for food using it's snout-like mouth.

Trunk Fish
The Smooth Trunkfish

Sharp-nosed Puffer

Small but unforgettable. Look for bright blue markings from nose to tail over a darker gold body. Even when they are not “puffing”, they stand out.

Sharp-nosed puffer
The Sharp-nosed Puffer

Turtle time

Two commonly sighted turtles in our area are Hawksbill turtles and Green turtles. Once you know one trick, they become much easier to distinguish.

Diver Swimming with Turtle
Hawksbill turtle

The easiest way to tell them apart is to look at the mouth and head shape:

  • Hawksbill: a more beak-like mouth, with a sharper profile

  • Green turtle: a rounder head and a less pointed mouth

Tip: if you cannot get a good look at the head, do not stress. Enjoy the moment, stay calm, and keep a respectful distance.


Where can I see this marine life with Manta?

You will see different species depending on conditions and where we go that day, but these are common on many of our dives and snorkels.


We hope you have enjoyed the first in our serios of Reef fish identification Cancun

If you want a classic reef day that is very photo-friendly, take a look at our shallow MUSA dive option:

If you are brand new and want to try scuba first, start here:


Final note

Of course, we see a wide variety of marine life on our dive and snorkel tours, and this is only a small selection. Keep an eye out for our next marine life post.

Do not forget to leave a comment with your favorite.

For more marine life photos and up-to-date Manta info, follow us on Instagram: @mantadiverscancun

Thanks for reading, The Manta Team

Questions or want help picking the right tour?

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Dive and snorkel with Manta Divers, Cancun.

Call (800) 659-0712 · Info@mantadivers.com · mantadivers.com

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