Age at length data for juvenile Grey demoiselle Chrysiptera glauca (Pomacentridae) in two contrasting tide pools in Mauritius

Submarine groundwater discharge (SGD) is an ubiquitous pathway for nutrient rich freshwater to coastal ecosystems, demonstrably altering their hydrography, hydrochemistry, and primary productivity. Yet only little is known about the effects of fresh SGD on the fitness of higher trophic levels such as teleost fish. We examined feeding intensities, somatic conditions, and growth rates in juvenile grey demoiselle Chrysiptera glauca sampled between October 2017 and January 2018 in two contrasting tide pools in Mauritius: One strictly marine tide pool at Flic en Flac and another one influenced by the influx of SGD (Albion).