Hydrophis caerulescens
Range
Indian Ocean (Pakistan, India, Bangladesh, Myanmar, Thailand, Malaysia), South China Sea and northern Australia
Size
Up to 74cm
The dwarf sea snake, listed here as the blue-grey sea snake, is a venomous sea snake. It is bluish or grey-blue above, merging to yellowish below, with 35–58 deep bluish-black crossbands that are as wide as or wider than the gaps between them, well defined in young animals and obscure in older ones. The head is black, and juveniles may have a yellowish horseshoe mark (Wikipedia, general species account).
Adults may reach a total length of 74 cm. The Reptile Database lists the Indian Ocean coast including Gujarat. The account used here gives no information on diet or breeding.