SEASONAL PATTERNS OF GAMETOGENESIS IN A NORTH ATLANTIC BROODING ASTEROID,LEPTASTERIAS TENERA

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Abstract
The gross structure and histology of the reproductive systems of the Northwest Atlantic brooding starfish L. tenera were studied over a 1 yr period. Spermatogenesis occurs on an annual cycle, and is similar to other asteroids. Oogenesis requires 24-30 mo. During the 1st year, oogonia develop to oocytes, with only a gradual increase in cell size. During the 2nd year, massive growth of oocytes is correlated with vitellogenesis. During most of the latter process, oocytes remain close to the basal membrane and hemal sinus, unless dislodged by crowding. Dislodged oocytes disintegrate, and are ultimately removed by amoeboid accessory cells. Gametogenesis and vitellogenesis take place during the spring and summer feeding period. Oviposition occurs in Nov. or Dec. Embryos develop for a short period (.apprx. 1 mo.) in the pyloric stomach, and are transferred into the brood chamber beneath the disc. The reproductive pattern is compared with other Leptasterias spp. Brooding reproduction may be a genetic characteristic of the genus, which is modified independently by the various species.

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