Coral Reef Diagnostics

Fiji - Vanua Balavu (FJVB56)

Khaled bin Sultan Living Oceans Foundation — Global Reef Expedition
⬇ Download this page as a report card
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
-17.1395, -179.0599
Coral cover
16%
± 2.3% SE, n = 4 transects · Benthic transects+photo-quadrats
Observations
cyanobacteria
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
3
1 shown on this page
Site summary
Read this summary in:

A heavily algae-dominated Vanua Balavu reef with just 16% coral cover against about 80% algae, where the one photo shown here is of a small, healthy tagged branching colony (one sampled by teammate Joao) hemmed in by green macroalgae and segmented green calcareous algae. It captures the survey numbers well: individual corals holding small patches of rock on a reef taken over by algae. Surveyed on the Living Oceans Foundation's Global Reef Expedition.

Max. depth dived
16.5 m
dive-log maximum
Water temp. during survey
27.0°Cii
-0.9°C vs the 2013 mean sea temperature (27.9°C)
ii Water temperature on Anderson's sample sheet for this dive (27°C); the dive-log entry was not a measured temperature and no CTD cast was taken on this dive.
Bottom time
44 min
in at 11:26

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

Site description

General benthic features

A hand holds a numbered tag beside a fist-sized branching colony, one that teammate Joao sampled (Anderson's photo; it is not F125, the colony Anderson sampled), its stubby lobed branches olive-brown and studded all over with pale, evenly spaced polyps — tissue fully pigmented, no bleaching, no lesions, no predation scars (e.g., Image 1).

Everything around it is algae. Bright green tufted and feathery macroalgae crowd in from the right, chains of green calcareous discs stack up along the edges of the frame, and green filmy growth covers the pavement between the colony and the pale rubble behind. A thin-branched, green-pigmented colony occupies the left background. What the frame shows is a healthy individual coral holding a small patch of hard substrate on a reef where fleshy and calcified algae have taken most of the space — which is exactly the picture the survey numbers give.

Coral cover

Stressors

Anderson's sample sheet records the one colony sampled here (F125, P. damicornis) as healthy, with none of it bleached. The Living Oceans Foundation transects here recorded 7.0% cyanobacteria and no recently dead coral; they have no bleaching, disease, or crown-of-thorns field. Island-level context, not an observation here: the expedition's Vanua Balavu site notes record crown-of-thorns predation at station FJVB55 and possible crown-of-thorns feeding scars at FJVB67.

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.

Other notes

No wider view of the site was available in this photo set. Anderson was busy sampling corals at this site, so the site description is derived from the Living Oceans Foundation's benthic transect data. Those transects recorded 16% hard coral cover. Anderson sampled 1 Pocillopora colony here, numbered 125 in the expedition series. Anderson's own photographs of F125 are not shown; the one published frame shows a colony Joao sampled, so the transect data, not the photograph, describe the site.

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.