The reproductive cycle of Asterina stellifera (Möbius) (Echinodermata: Asteroidea) in the Cabo Frio region, southeastern Brazil

Abstract

Reproduction of Asterina stellifera was studied in two populations from the Cabo Frio region, southeastern Brazil. One was located in an intertidal seagrass flat at Japones Island (1994–1995); the second was on a sublittoral rocky shore at Pontal beaches (1999–2000). Reproductive cycle was studied at monthly intervals by organ indices and histological examinations of gonads. Although these two populations were studied in different habitats and at different times, the periodicity of the annual reproductive cycle was very similar for the two populations. The highest gonad index (GI) values were found in August/September (late winter), followed by a drop in GI values, indicating spawning. The GI and pyloric caeca index (PCI) tended to have an inverse relationship in both populations, but it was only statistically significant in the rocky-shore population. Gametogenesis in the two populations was described and roughly confirmed the reproductive cycles determined by GIs.