sorry, can't help, but order the new Fishes of the western Indian Ocean http://www.saiab.ac.za/coastal-fishes-of-the-western-indian-ocean.htm

Hi there, I also think that it could be a juvenile Chrysiptera glauca.

You may order this book

http://www.quae.com/fr/r2100-fishes-of-the-indian-ocean-and-red-sea.html

Thank you very much! We counted the specimen's spines and fin rays:

Dorsal spines: 13, Dorsal soft rays: 13, Anal spines: 2, Anal soft rays: 13

Because of the coloration we tend to think that it is Chrysiptera glauca.

according to Allen&Steene, Reef fishes of the Indian Ocean, it is C. glauca. The pic in the book is even from Mauritius. (come to my office and see ;-))

Dear Dr Date:16 Nov 2017

Family: Pomacentridae

Scientific name: Chrysiptera glauca (Cuvier, 1830)

En Name: Grey demoiselle

Description:

Dorsal spines 13; rays 12-13; Anal spines 2; Rays 11-13 (According to your specimen to count DS/Rays; AS/Rays)

Distribution: Indo-Pacific (Almost Tropical- Sub tropical region), Africa, Japan, Australia, Gulf of Mannar, India.

Maximum length: 11.5 cm

Life span: 3.5 years

Age at first maturity: 1.1 years

Food: plants/detritus

reg

Dr Vaitheeswaran Thiruvengadam

Whatsup No: +256 702071260

Uganda No: 0720029712 (Kampala, Uganda, East Africa)

Indian Moblie Number: +91 9043810354

E.mail: [email protected]

Thanks again for helping me identify the species! Chrysiptera glauca served as a model organism in our most recent study: https://www.frontiersin.org/articles/10.3389/fmars.2019.00613/full

(some of you guys made it into the acknowledgment section, by the way)