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The scientific literature on population dynamics, breeding biology and nesting behaviour of the Asian horseshoe crabs is limited and still to emerge from several locations in South and Southeast Asia. The present study (2009–2011), aimed at observing the spawning activity of Tachypleus gigas (Müller, 1785) in relation to local environmental conditions, was carried out from Tanjung Selangor (Sites 1–3) on the east coast of Peninsular Malaysia. Southwest (SW) monsoon (May–September) was found to be more favourable (range, 456–1309 eggs) than Inter-monsoon (IM) (April and October) (169–317 eggs), whereas no eggs at the time of Northeast (NE) monsoon (November–March). Meanwhile, T. gigas preferred Site-1 (located close to River Pahang mouth) for its nesting in the SW and shifted to Site-2 and/or Site-3 (located 150–200 m interior) in the IM periods. This nest shifting behaviour of T. gigas was primarily …