Coral Reef Diagnostics

Indonesia - Komodo NP: Three Sisters (Tiga Dara)

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05
Photo: Anderson Mayfield/Coral Reef Diagnostics
Country
Survey date(s)
2019-01-23
Coordinates
-8.7800, 119.5450
Coral cover
8.3%
Claude computer vision (34 edited photos) · other methods below
Observations
not yet tagged for this site
Heat stress
Today’s heat load
16 Sep 2026 · No heat stress
5-year thermal stress load
5-year mean max. degree heating weeks (DHW)
2021–2025
NOAA Coral Reef Watch — East Nusa Tenggara 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 infoEast Nusa Tenggara (NOAA CRW virtual station) · Lesser Sunda ecoregion mean=6.9°C-heating weeks
Photographs
37
Site summary
Read this summary in:

Anderson's least favorite Komodo dive because of an incessant washing-machine current, on a steep slope where the depths are mostly sponges, soft corals, black-coral whips, and foliose plates. The shallows he did rate, with colorful Acropora tables over pink coralline crust and butterflyfish around them.

Max. depth dived
29.6 m
Water temp. during survey
25.6°Cii
-2.0°C vs the 2019 mean sea temperature (27.6°C)
ii Dive-computer reading of 78°F, converted; reported to one decimal because the instrument resolved whole degrees Fahrenheit.
More infoNote: NOAA's regional station series averages 1.0°C warmer than the satellite pixel nearest this site (2.3 km away), which is used here instead.

One other CRD dive site within 5 km shown in orange — click a marker to open its page.

5 of these 37 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

The frames track the depth gradient he describes. The deepest-looking frame is dim and blue-shadowed, a steep slope where the framework is foliaceous: a pale mustard-olive laminar plate with a white margin, stacked foliose sheets, a broad pale leathery soft coral, a tabulate Acropora above, and maroon and red encrusting sponges between, with orange anthias hanging in front of it - directly his note that depth here was mostly sponges and foliaceous sheets, and dark at 24 m because of the early entry (e.g., Image 2).

A cryptic close-up from the same band is almost pure invertebrate color with no stony framework at all: salmon and red-and-white Dendronephthya, a yellow-green crinoid, colonial tunicates, pink, and maroon encrusting sponges, and chartreuse algae (e.g., Image 3).

A third slope frame is high-relief and sponge-heavy: broad mustard encrusting sponge sheets, red sponge fans, wiry black-coral whips, a bright green bushy colony, salmon and gray-brown Acropora tables, and small pink corymbose colonies, with open blue water off the flank (e.g., Image 4).

The shallow frame is the one he rated: three Acropora tables together, the largest mustard-olive with a vivid white growing rim, a lavender-gray table beside it, and a salmon branching colony below, on pink crustose coralline algae, with several butterflyfish and a cleaner wrasse (e.g., Image 5).

Coral cover

Coral cover: 8.3% — a blind Claude computer-vision point count of 34 of Anderson's edited photographs (20 points per photo; water, fish, and obstructions excluded). Other computer-vision methods are listed in the method table. These are computer-vision indices over photographs, not a diver transect, and a site where sponges and octocorals hold much of the substrate is a hard case for them. Anderson is still comparing computer-vision models, and these figures will be updated as the methods improve.

Stressors

No bleaching, disease, or predation is resolvable, and nothing man-made appears.

Fish and other fauna

The fifth frame is open blue water with a loose school of unicornfish and no substrate (e.g., Image 1).

Comparisons with other data

Also on record for this site: Saw first giant trevally of trip (much more common in Raja Ampat). Very dark at 24 m on account of doing dive early in morning (7:30). Stylophora pistillata, pygmy seahorse, Pocillopora verrucosa, small poritids, fluorescent orange soft coral, giant Isopora colonies in shallows. Large morays (green), high Acropora cover and diversity in shallows (5-8 m). though difficult to photograph on account of currents.

Dive record

One dive, 23 January 2019, 07:30, 50 minutes, max 29.6 m, average 15.2 m, 25.6 degrees C, 10 m visibility - his least favorite dive of the trip because of an incessant washing-machine current.

CV model comparison

As 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.
Headline: Claude computer vision — a blind point count of this site's own photographs (Anderson, 2026-09-27: Claude CV is the main coral-cover value).
More infoDINOv3 and CoralSCOP were run on the same photos and are listed for comparison. Coralscapes v2 and v1 were also run but are not shown: Anderson does not consider Coralscapes reliable for these photos. No diver transect exists for this trip, so agreement between the rows is not accuracy, and as of September 2026 no computer-vision method estimates coral cover accurately on new images; treat every row as indicative.
MethodHard-coral cover (%)
In-house DINOv319.7
CoralSCOP edited28.5
Claude (edited photos)8.3

Data & links

All images from Coral Reef Diagnostics. Data are from Coral Reef Diagnostics.

© Coral Reef Diagnostics.