The discovery was made in 2015 during a survey of fish in Tonga. The Museum researchers recorded Meiacanthus bundoon in Teleki Tonga (South Minerva) and Meiacanthus oualanensis in Teleki Tokelau and Teleki Tonga (North and South Minerva), both previously only recorded around Fiji, extending their known distribution.
Discovering these fish was unusual considering that they were thought to have a very narrow distribution and be endemic to (only found in) a small area around Fiji. Thus, perhaps these species are less isolated than originally thought.
More discoveries to come?
Over the last ten years, the Museum has been undertaking marine biodiversity surveys in the South Pacific. The results of the surveys have been quite dramatic, with each revealing fish populations to be about 10-20% more diverse than expected. This indicates there are still many species yet to be recognised from islands across the South Pacific region.
Diversity of fishes across Te Moana Nui a Hiva, the Pacific Ocean, diminishes as one heads east. A person travelling through New Caledonia, Vanuatu, Fiji, Tonga, and the Cook Islands, in that order, would notice the fish fauna becoming less diverse in each country.
But just how great is this drop off in diversity? For now, we can say: not as great as once thought.
Image: Top and bottom, Bundoon fangblenny (Meiacanthus bundoon) only recorded from Kadavu and the Lau islands of Fiji, and Haʻapai in Tonga; middle, Canary fangblenny (Meiacanthus oualanensis) only recorded from Fiji.