. The ecology of coral reefs : results of a Workshop on Coral Reef Ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983 . SlZE(mm) Figure frequency distributions of discs of the three fissiparous brittle stars at Discovery Bay (August 1981). contain ripe gonads, and of mm, 57 were female (23%). this study, 11 with disc di gonads. Of the 11, 2 with females, 3 with disc diamet remaining 6 were unsexable Discovery Bay sites contain have shown that at the Bogu coast, 0^_ savignyi achieved disc diameters greater than sexual reproduction. The in diam
. The ecology of coral reefs : results of a Workshop on Coral Reef Ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983 . SlZE(mm) Figure frequency distributions of discs of the three fissiparous brittle stars at Discovery Bay (August 1981). contain ripe gonads, and of mm, 57 were female (23%). this study, 11 with disc di gonads. Of the 11, 2 with females, 3 with disc diamet remaining 6 were unsexable Discovery Bay sites contain have shown that at the Bogu coast, 0^_ savignyi achieved disc diameters greater than sexual reproduction. The in diameter, and the larges roughly 10,000 eggs. 246 animals with disc diameters greater than Of the 56 specimens of 0. isacanthum examined during ameters greater than mm had recognizable disc diameters of and mm were mature ers of and mm were mature males, and the None of the 0. savignyi examined from the ed gonads (table 3), but Emson and Wilkie (1984) e Islands in Montego Bay on the Jamaican north a larger size (up to mm) and specimens with mm may contain ripe ova and achieve successful argest oocytes in these specimens measured mm t individual ( disc diameter) contained The three fissiparous species are similar in producing small eggs within the size range ( mm) regarded as resulting in planktotrophic larvae (Hendler, 1975; Mladenov, 1979). Since disc size and egg size are similar in the three species, it is not surprising that reproductive output, as measured by maximum number of eggs produced, is roughly equivalent (table 3). The maximum egg number for these species is two to three orders of magnitude lower than that recorded for nonfis- siparous brittle stars with planktotrophic development (Hendler, 1975; Mladenov, 1979; Mladenov and Emson, 1984). Compared to their nonfissiparous planktotrophic 94
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