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The spring inshore migration of Echinus at Port Erin in 1930 started in early February and reached its maximum in the middle of March. Mature gonads were found at the end of February and throughout March and early April. At the end of June all gonads examined were spent. The sea temperature throughout this period was observed. It is probable that May was the chief month in which natural spawning took place. A cycle of changes in the composition of the gonad are recorded from November 1929 todoi:10.1242/jeb.8.2.133 fatcat:yg4ww3zh7rccron547c3nvcx3a