Coral Reef Diagnostics

Fiji - Vanua Balavu (FJVB55)

Khaled bin Sultan Living Oceans Foundation — Global Reef Expedition
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05
Outlier score: 3.89/5 (Vanua Balavu, n = 18 corals with an outlier score). The share of those corals whose molecular stress profile was an outlier, rescaled to 0-5 (5 = no outliers); an island-level measure (Mayfield et al. 2017), not a Coral Health Index.
Photo: Anderson Mayfield/Coral Reef Diagnostics
Country
Survey date(s)
2013-06-22
Coordinates
-17.1534, -179.0049
Coral cover
29%
± 5.2% SE, n = 6 transects · Benthic transects+photo-quadrats
Observations
bleachingcyanobacteria
Heat stress
Most recent heat load record
26 Oct 2026 · No heat stress
5-year thermal stress load
5-year mean max. degree heating weeks (DHW)
2021–2025
NOAA Coral Reef Watch — Fiji 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 infoFiji (NOAA CRW virtual station)
Photographs
21
Site summary
Read this summary in:

A Vanua Balavu reef (dived to 31.4 m) of low pavement and pale rubble, where a whitetip reef shark cruised, at 29% cover. One photo shows a healthy massive dome, which Anderson left unidentified, crowded by blue-green sea squirts, and a large jellyfish drifted just off the bottom. Surveyed on the Living Oceans Foundation's Global Reef Expedition.

Max. depth dived
31.4 m
dive-log maximum
Water temp. during survey
27.1°Cii
CTD-cast midpoint; the cast read 27.1°C throughout
-0.8°C vs the 2013 mean sea temperature (27.9°C)
ii Station CTD-cast midpoint (LOF station records), not a dive reading: midpoint of the station's maximum and minimum CTD water temperature (Living Oceans Foundation Fiji station records); the cast read 27.12°C throughout.
Bottom time
62 min
in at 09:20

Site description

Setting

FJVB55 (dived to 31.4 m) sits on a reef that point-count survey scored at 29% coral cover, with algae claiming half the bottom.

General benthic features

The full FJVB55 photo set is mostly a record of the physiological-sampling work rather than of the reef. Eighteen of the 21 frames are close-range colony portraits: eight taken during tagging (e.g., Image 7, Image 8, Image 9, Image 12, Image 13, Image 17, Image 18, Image 19), in which a gloved hand holds a numbered tag beside an individual knobby branching colony while the colony is documented, most of them cream, olive, or golden-brown with fine knobbed branches, one a squatter pink-brown colony with coarse verrucae (e.g., Image 19), each set into coralline-crusted pavement with green algal turf and other small colonies around it; and ten of the colonies Anderson sampled (F119-F124) (e.g., Image 1, Image 2, Image 3, Image 5, Image 6, Image 14, Image 15, Image 16, Image 20, Image 21).

These are the tagged colonies behind this site's outlier sampling, and they are working frames: they show colony-level detail at arm's length and say nothing about cover or community structure. Of the three remaining frames, two look at the site itself and the third is the jellyfish described below. One (Image 10) is a dim wide view across low pavement and pale rubble with a whitetip reef shark crossing it.

One (Image 11), of a coral Anderson left unidentified, is a portrait of a yellow-olive massive dome packed with evenly spaced conical corallites, tissue continuous and apparently healthy, with clusters of pale blue-green colonial tunicates and encrusting sponge crowding the rock beside it.

Coral cover

Stressors

No disease or crown-of-thorns damage is visible in any frame, but with only two reef-facing frames the set cannot characterize this reef and should not be read as doing so. The survey team's notes record some crown-of-thorns predation at FJVB55. Anderson's sample sheet notes one of the colonies sampled here (F124.1, pictured in Image 20 and Image 21) as 30% bleached; its healthy portion was sampled. Of the four coral colonies from this site with an outlier score, one (25%) was flagged as a physiological outlier (Mayfield et al. 2017, PLoS ONE). The Living Oceans Foundation transects here recorded 16% cyanobacteria and no recently dead coral.

Fish and other fauna

A large, pale, translucent jellyfish bell drifts just above the bottom (e.g., Image 4).

Comparisons with other data

Apart from the Living Oceans Foundation survey shown here, we found no other surveys at this site as of 2026. If you would like to share yours, please email us.

Data & links

All images from Coral Reef Diagnostics. Data are from the Khaled bin Sultan Living Oceans Foundation Global Reef Expedition and Coral Reef Diagnostics.

© Coral Reef Diagnostics.