The reproductive biology and social structure of the protogynous stoplight parrotfish, Sparisoma viride, were investigated from 1985–1987 in shallow-water areas (<10 m) at Grand Turk, Turks and Caicos Islands, B.W.I. Over 225 fish were speared, and size at maturation
and sex reversal, number of eggs in ripe females, stage of sexual development and variation in reproductive condition were determined. Sex reversal occurred from 150 to 250 mm standard length (SL). Females matured between 170 and 270 mm SL, but ripe eggs were found only in females >260
mm SL indicating a period of growth between maturation and reproduction. Gonadal indices for females >260 mm SL varied among sites, with higher gonadal indices found at the more exposed sites. Egg counts among ripe females varied widely (5,543–68,606 eggs˙female−1)
and showed no relationship to size. Visual surveys indicated that abundance and sex ratio varied according to habitat, with males predominating in the lagoon and females off the ends of the island. Overall, stoplight parrotfish were more abundant off the ends of the island where reproductively
active individuals appeared to congregate. Results indicate that S. viride at Grand Turk maintains some sort of haremic mating system.
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