Brasil Reef - Fórum de Aquário - Aquarismo - Marinho, Corais e Água Doce

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3.5 – Spawning: Depending on the species, surgeonfish spawn in aggregations (ex.:A. mata, A. nigrofuscus, A. triostegus, C. striatus) or as pairs (ex.:A. leucosternon, A. nigricauda, A. dussumieri and many Naso and Zebrasoma species) (12). Many species can spawn either way and A. lineatus, despite forming spawning aggregations, spawn in pairs (12). An interesting spawning habit is reported to Ctenochaetus striatus from Tahiti. They form schools of several thousand individuals near full moon, remain motionless for between 1 to 3 hours and change their normal color to pale gray. Then, a group of 4 or 5 fishes rise above the main school, spawn and return to former place. This goes one with a new group replacing the previous one (12).Often resident aggregations occur at a specific time of day often over many days, even year-round, and last a few hours or less (3). Many of the surgeonfish display seasonal patterns in fecundity, although the few specific studies of reproductive seasonality within the Acanthuridae have shown substantial differences in annual spawning patterns among species. Z. flavescens has been observed to spawn year-round, although egg production is reduced in the winter (9). Other species that seem to have annual spawning patterns are Acanthurus nigrofuscus and A. triostegus, but such patterns may vary according to geographic region, e.g. A. triostegus spawn year-round in American Samoa but has a distinct spawning period in Hawaii. Captive Z. flavescens, on the other hand, harvested from Oahu and Hawaii Island have been found to spawn during all months of the year, so data from nature may not be transferable to captive conditions (7).

( 7) Animal World, http://animal-world.com/encyclo/marine/information/breedmarine.php#Tangs

(12) Fishbase - http://www.fishbase.org/identification/ ... &areacode=