DiveCodex

La Trencada

Reef off Mataró.

The dive

Anchor at the ridge's midpoint and pick a direction based on current. The flat top spreads 10-12 metres wide at 12 metres depth — broad enough to wander laterally rather than just following the ridge. Heading northeast leads to the most productive section: a cornisa at 13 metres on the landward face where morays peer from crevices, cleaner shrimp station themselves at cavity entrances, and lobsters wedge into gaps between rocks. The southwestern end breaks into loose flat blocks at 13-14 metres, a more scattered landscape. A Posidonia meadow flanks the ridge throughout, its seagrass canopy swaying in whatever light current reaches this depth.

What makes it special

Stingrays use La Trencada as a breeding ground. The shallow ridges inside the Maresme conservation area provide the conditions pastinacas need during their reproductive season, and this site is one of the most reliable spots to encounter them. The other defining feature is the scorpionfish camouflage — the ridge's algae cover and reddish rock tones create a colour match so effective that spotting them becomes a challenge at any size. These are not species you find at every Maresme ridge in this concentration. The NE ledge compresses an outsized amount of life into a 13-metre-deep shelf that repays close inspection far more than swimming distance.

Know before you go

Bring a torch to illuminate the crevices along the NE ledge, where the best macro life concentrates in shadow. Visibility averages around 11 metres — adequate but not expansive, so close-range observation works better than trying to take in broad vistas. The site sits within the Maresme Special Conservation Area but no dive permit is needed. Blaumar and Mediterranean Dive both run boat trips from Port Mataró. La Trencada pairs naturally with a deeper first dive at El Negre — ask your centre about the combination. The shallow depth means extended bottom times with no Nitrox needed, making it practical even on a conservative profile.

Depth & Profile

12m
Min depth
16m
Max depth
12–14m
Typical range
reefrocksandposidonia

Location

41.5350°N, 2.4900°E

Conditions

Visibility
10–15m
Current
negligible

Difficulty & Certification

easyMin cert: OW

Beginner-friendly depth throughout. Excellent as a second dive after deeper sites.

Frequently Asked Questions

Why is La Trencada used as a second dive?
At 12-16m, the depth profile is ideal after a deeper first dive — your nitrogen loading stays conservative while the site still delivers a full dive's worth of marine life. Centres often pair it with El Negre, which sits deeper in the same ridge system.
What is the Maresme Special Conservation Area?
A designated conservation zone covering the shallow submarine ridges off Mataró. La Trencada sits within it, which contributes to the stingray breeding habitat and Posidonia meadow health. No special dive permit is required.
Where should I focus my time on this dive?
The northeastern third. A cornisa (ledge) at 13m on the landward face concentrates the best habitat — morays, cleaner shrimp, lobsters, and scorpionfish all use this compressed section. The flat top and loose blocks elsewhere are less productive by comparison.
When are the stingrays present at La Trencada?
During breeding season — they are described as very common at La Trencada and other shallow ridges in the conservation zone during this period. The exact months are not precisely documented in available sources.
How does La Trencada compare to El Negre?
El Negre is deeper and often used as the first dive of a two-dive trip, with La Trencada as the shallower follow-up. La Trencada's flat top and NE ledge offer a different kind of diving — less about depth, more about scanning compressed habitat at close range.
Is La Trencada good for spotting scorpionfish?
Particularly good. The algae covering the ridge matches the reddish rock tones, giving scorpionfish near-perfect camouflage. Multiple sizes have been documented — look carefully on the flat top and along the ledges, especially where algae growth is thickest.
What is the Posidonia meadow next to La Trencada?
Posidonia oceanica is a protected Mediterranean seagrass that runs alongside the ridge. It adds ecological value to the site — the meadow provides nursery habitat for juvenile fish and stabilises the sandy substrate around the rock structure.

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