Coral Reef Diagnostics

Maldives - Fish House (Fish Head)

Reef Check Foundation
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05
Photo: Anderson Mayfield/Coral Reef Diagnostics
Country
Survey date(s)
2017-05-26
Coordinates
3.9360, 72.9131
Coral cover
9.4%
Computer vision (20 photos) · details below
Observations
not yet tagged for this site
Heat stress
Today’s heat load
16 Sep 2026 · Bleaching Watch
5-year thermal stress load
5-year mean max. degree heating weeks (DHW)
2021–2025
NOAA Coral Reef Watch — Maldives virtual station
i 5-year mean max. DHW is the mean of the annual maximum DHWs over the five complete years named above, not conditions today.
More infoMaldives (NOAA CRW virtual station) · Maldives ecoregion mean=2.9°C-heating weeks
Photographs
25
Site summary

The trip's closing dive over a bare, current-polished ridge thick with triggerfish, bannerfish, whitetip, and gray reef sharks, and a giant moray caught free-swimming in daylight - light on coral but a strong finish for fish life. Computer vision cover estimate is around 9.4%.

Max. depth dived
29.3 m
dive-log maximum

Five independent survey stations shown with the program’s logo — click one to see how far it is from this site.

9 of these 25 photographs are shown beside the text that discusses them under "Site description" below.

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Photo credit & attribution

Site description

General benthic features

Not much coral (e.g., Image 21) — but as a final helping of raw Maldivian fish life, unbeatable.

Coral cover

Coral cover: 9.4% — photo-derived, and the two methods broadly agree (13% vs 6.3%). This site's figure is the mean of two independent computer vision passes over Anderson's own frames: a DINOv3 calibrated point classifier reads 12.5% and a CoralSCOP computer vision reads 6.3%, a spread of 6.2 percentage points. The map publishes the mean so sites can be sorted against one another, but the honest statement of what is known here is the 6.3–13% range: the two products have different denominators and should not be treated as one measurement.

Stressors

No crown-of-thorns starfish (COTS) or other corallivores evident.

Fish and other fauna

Over a bare, current-polished ridge the water itself is the habitat: thunderhead clouds of dark redtoothed triggerfish, drifting flotillas of bannerfish, and an orange anthias haze that clings to every surviving coral head (e.g., Image 3, Image 4, Image 12).

Through it all the sharks commute — whitetip reef sharks skimming the pavement in ones and twos (e.g., Image 10), a bulkier gray reef shark ghosting past in the blue (e.g., Image 14) — while a golden phalanx of bluestripe snapper packs into a hollow with a jack circling its edges (e.g., Image 23).

The boldest resident is a giant moray caught free-swimming in broad daylight, rippling across the pink coralline rock with no crevice in sight (e.g., Image 19).

A curious batfish sees the divers off (e.g., Image 1).

Comparisons with other data

No independent survey was made at this exact site; the nearest ones are listed in the table below.

Dive record

The last dive of the trip, and the name is a promise kept.

CV model comparison

DINOv3 13%, CoralSCOP 6.3%; the headline is their mean.
More infoAs of September 2026 no computer-vision method estimates coral cover accurately on new images, so treat this as indicative rather than a measurement; it is revised as the methods improve.
The two methods broadly agree (spread 6.2 pp).
More infoThe published figure is the mean of the two methods.
MethodHard-coral cover (%)
In-house DINOv312.5
CoralSCOP6.3
Mean (± SD)9.4 ± 4.4
Range6.3–12.5

Mean ± SD and range are across the computer-vision methods shown.

Independent surveys nearby

Data availability near this site
Agency / programYear(s)Stations / distanceLink
Montefalcone et al. (2020)2017–20191 station, 2.58 kmRecords ↓
Reef Check1997–20194 stations, 3.08–3.92 kmRecords ↓
Hard coral cover over time — this site and every independent station within 5 km. Programs are shown separately because they use different methods at different stations; the lines are not one comparable series.
0%15%30%45%60%199720082019Reef Check 1997: 41%Reef Check 2017: 16%Reef Check 2017: 52%Reef Check 2019: 11%Montefalcone et al. (2020) 2017: 7.0%Montefalcone et al. (2020) 2019: 18%Dr. Coral (CRD) 2017: 9.4%Year-averaged across all programs: no detectable trend (-1.10 pp per year, not separable from zero; 3 years)
Reef Check Montefalcone et al. (2020) Dr. Coral (CRD)Year-average (no detectable trend)

Within 5 km, 5 independent survey stations recorded hard coral cover in 10 surveys between 1997 and 2019. Of the 1 station surveyed in more than one year, 1 increased between their first and latest surveys. The longest record, Kubulabhi Etheru (Montefalcone et al. 2020, 2.58 km away), went from 7.0% in 2017 to 18% in 2019. The most recent nearby survey is from 2019, so these values predate recent heat stress. This site's own estimate (9.4%) sits within the range of these surveys (7.0–52%); the methods differ, so the comparison is context, not a like-for-like test.

Collected by other programs using different methods (Reef Check uses point-intercept transects), so these are context for the figures above, not a like-for-like comparison. Where a station was surveyed more than once the range is shown. Station names are not dive-site names.

Independent survey data near this site
AgencySite / locationDateHard coral cover (%)DistanceLink
Reef CheckOrimas Faru Nord199741% (2 surveys)3.45 km—
Montefalcone et al. (2020)Kubulabhi Etheru2017–20197.0–18% (2 surveys)2.58 kmHeatCRD database
Reef CheckKubuladhi Inner201716% (2 surveys)3.80 km—
Reef CheckFaanu Madugau Inner Reef201752% (2 surveys)3.92 km—
Reef CheckKubuladi etere201911% (2 surveys)3.08 km—

Data & links

All images from Coral Reef Diagnostics. Data are from Coral Reef Diagnostics and the organizations named in the data-sources table above.

© Coral Reef Diagnostics.