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The large caerulean damselfish, Pomacentrus caeruleopunctatus Allen, 2002, is recorded for the first time from Reunion Island. Two individuals were observed and photographed between January and March 2012 on L'Hermitage reef, located on the west coast of the island. A review of high-resolution profile photographs of these two individuals shows that their external morphological characteristics agree well with those reported in the original description of the species. These observations suggest an extension of the known distribution of the species, previously restricted to the Seychelles Islands, Madagascar, and Tanzania, to the Mascarene Archipelago, and moreover the known depth range of this species.

The lattice soldierfish, Myripristis violacea Bleeker, 1851, is recorded for the first time from Reunion Island. An aggregation of 12 individuals was observed and photographed on 12 January 2019 and later on the L'Hermitage reef, located on the west coast of the island. Examination of high-resolution photographs of the largest of these individuals shows that its external morphological characteristics agree well with those reported in the description of the species provided by the last revision of the genus. Studies on regional connectivity make it likely that the Reunion Island population of M. violacea originates from the northern Seychelles Island or Chagos Archipelago via stepping-stone populations. Our observations extend the known distribution of the species to the southernmost island of the Mascarene Archipelago, and extend its known depth range.

The green birdmouth wrasse Gomphosus caeruleus is present all year round on the coral reefs of Reunion Island (Indian Ocean). A group of individuals was followed on one of these reefs with the objective of studying the reproduction mode of the species, the influence of environmental factors, and social behaviors on the control of reproduction. Our observations revealed that G. caeruleus is, like many Labridae, a protogynous hermaphrodite species, probably diandric, that the reproduction of G. caeruleus is, like in other reef fish species, influenced by the lunar cycle with a peak of reproductive activity during waxing gibbous phase, and that G. caeruleus displays social behavior leading to alternating haremic mating system on a single territory and lek-like mating systems without aggressions between males. These observations enhanced our knowledge of the reproduction of Labridae and reef species.

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