Indonesia - Banda Islands: Goat Hall (Pulau Ai)

Setting

Goat Hall lies at the eastern end of Pulau Ai, in the Banda Islands of Maluku, and Anderson dived it once, on the afternoon of 27 April 2018 — in at 13:04, 61 minutes, 14 m maximum, 8.53 m average, 30.3°C (dive average). The dive begins deep on a near-vertical wall and works steadily up onto a shallow crest, so the profile reads cleanly through the sequence.

General benthic features

The wall and drop-off shoulder (39 frames) is a steep-to-vertical face crusted in pink and mauve coralline algae and worked over by filter feeders: brown barrel sponges standing off the wall, black-coral bushes, and cream Sarcophyton toadstools (e.g., Image 3).

3

Stony coral here is patchy and dominated by two forms — mustard-yellow and golden-orange ruffled foliose plating consistent with Turbinaria, and large tan domes with even, regularly spaced corallites consistent with Diploastrea and massive Porites (e.g., Image 1, Image 2).

12

Bright green Nephthea- and Sinularia-type soft corals, cream branching Acropora, and pink knobby pocilloporids fill the gaps. The upper wall and mixed slope (48 frames) is the genus-rich middle of the dive and the most varied ground on it: corymbose and branching Acropora in salmon-pink, cream, gold, and bright green; thick-fingered columnar Porites of the P. cylindrica/rus habit; maroon and purple foliose plating (Montipora/Echinopora-type); meandroid Platygyra- and Lobophyllia-type brains; encrusting Montipora sheets in yellow-green; free-living fungiids; and a large salmon-and-red sea fan consistent with Melithaea standing off the lip (e.g., Image 4).

4

The crest and branching pavement (44 frames) is where the coral actually is. Fine-branched and corymbose Acropora, Seriatopora-type thickets, and golden Millepora-type hydrocoral form mounded, near-continuous carpets that run to the limit of visibility in four frames, with columnar Porites stands and pale lavender plating threaded through them (e.g., Image 5).

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A Sarcophyton terrace follows (7 frames), and it is one of the striking sights of the dive: hundreds of golden-tan, deeply convoluted toadstool leather corals packed wall to wall over the reef top, with stony colonies reduced to emergents inside them.

Coral cover

• Reference: Claude CV point count (this site's photos)
• Coral cover: 36% — a blind Claude computer-vision point count of 144 of Anderson's edited photographs (20 points per photo; water, fish, and obstructions excluded). Other computer-vision methods are listed in the method table.

Stressors

Condition was good: no crown-of-thorns, no disease lesion, and no Drupella scarring was seen in any of the 146 frames, and the black spiny mass beneath one branching colony resolves on close crop to feather-star arms and urchin spines, not Acanthaster. Two observations are worth recording. One frame shows a large massive dome, consistent with Astreopora or Porites, carrying a sharply bounded patch of denuded skeleton across perhaps a fifth of its upper surface; the exposed skeleton is already fouled gray-green with turf and a green Acropora has grown against its margin, so this reads as older partial mortality rather than recent bleaching. Two frames show a large helmet-shaped dome, uniformly pale lavender-white and conspicuously paler than every colony around it, that Anderson identified as bleached (one colony).

Fish and other fauna

Feather stars in vivid yellow-green and in black perch on the framework throughout. A hawksbill turtle sequence and shallow crest close the dive (12 frames), the turtle photographed four times among staghorn and corymbose Acropora, with a 1.5 m tabulate Acropora table in one frame and sergeant majors, butterflyfish, and anemonefish over the top. The hawksbill, fusilier and anthias clouds, chromis, sergeant majors, Moorish idols, bannerfish, butterflyfish, anemonefish, feather stars in yellow-green and black, Diadema-type urchins, and barrel sponges.

Comparisons with other data

Goat Hall is the site Reef Check surveys as 'Pulau Ay, Lubang Kambing' (goat hole): its hard coral cover averaged 23% in 2015, 36% in 2016, 40% in 2019, 47% in 2024, and 51% in 2025, so this dive, in April 2018, fell between the 2016 and 2019 surveys. Those are point-intercept transects at 4-6 m and 10 m by Reef Check teams; the figure on this page comes from photographs, a different method, so the series is context for this dive rather than a repeat of it.

Dive record

It was Anderson's second dive of that day, after Shark Point on the same island, and it produced 146 frames.

Other notes

Two closing frames are open blue water.