Arguineguín Reef, Gran Canaria: volcanic reef and abundant life

Arguineguín Reef stretches for about 700 meters just outside the port of Arguineguín, presenting a volcanic formation that sits on a sandy bottom. This geological structure is defined by its many overhangs, cracks, and crevices, providing natural shelter. The reef forms a landscape where you can drift along when conditions allow, moving through areas rich in smaller marine species that utilize these protected spaces as hideouts and hunting grounds.

The maximum depth on the reef is around 20 meters, with much of the exploration happening between 12 and 16 meters. This profile makes it a comfortable dive. As you descend, the light filters through the water, illuminating the volcanic formations, creating a mosaic of shadows and highlights. The sandy areas around the reef are often where you’ll spot activity from bottom-dwelling species, blending into their environment.

Life on the reef is varied. Moray eels are commonly found in the reef's numerous openings, while barracudas and schools of trumpetfish move through the water column above the structure. You will also encounter octopus and cuttlefish, often well-camouflaged, observing their surroundings from the sandy edges or within the reef's nooks. It's a busy ecosystem, with something happening at every depth.

A notable feature of Arguineguín Reef is the presence of large schools of grunts, or 'roncadores', that congregate in certain areas, particularly under the larger overhangs. These aggregations offer a dynamic sight, with the fish moving in unison. Beyond the grunts, there are instances of yellow snappers and sardines, contributing to the reef's overall biomass and attracting other marine predators.

The overhangs themselves are key habitats. They provide refuge for stingrays and common brown rays, often found resting on the sand beneath the rock formations. The sheltered surfaces are also colonized by colorful anemones and cleaner shrimp, which set up their cleaning stations. Keep an eye out for these smaller inhabitants as you explore the reef's contours.

Among the more distinctive residents, you might encounter the elusive porcupine fish, a large pufferfish species known to grow up to a meter in length. These are often tucked away in deeper overhangs. While not an everyday sighting, their presence adds to the unique character of this reef. Turtles are also frequent visitors, moving gracefully over the reef, and you may spot amberjacks cruising past the deeper sections.

The current at Arguineguín Reef is typically moderate. At times, conditions can be suitable for a drift dive, utilizing the current to cover more ground along the reef's length. This allows for a different perspective, letting you glide over the volcanic structures and observe the marine inhabitants without expending too much energy. The reef's elongated shape lends itself well to these opportunities.

An interesting aspect of the sandy transition zones surrounding the reef is the potential to spot angel sharks. These sharks, which are more active in winter, often lie partially buried. Their presence, alongside curious octopuses and cuttlefish in these areas, highlights the diverse habitats this single site encompasses, from the rocky reef structure to its sandy periphery.