Abstract
The seastar Marthasterias glacialis (L.) was seen to spawn in two sea inlets, Lough Hyne (9°18′W; 51°30′N) and Mulroy Bay (7°42′W; 55°12′N), Ireland. Spawning occurred during the afternoon and early evening between 13.30 and 21.30 hrs British Summer Time (BST) on sunny days during July and August, 1978. Groups remained assembled for days prior to spawning. Solitary and grouped seastars arched themselves and released their gametes freely. Local moderate onshore winds on sunny days resulted in increases of sea temperature which often induced spawning. Males observed spawning ranged from 2.5 to 26 cm and females from 9 to 22 cm in diameter over the period 1978–1985.
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