 The females spawn by passing eggs from their oviducts . These eggs are then coated in gelatinous substances from the nidamental glands and oviducal glands , forming an egg ' capsule ' . The egg capsules of the bigfin reef squids contain two to nine eggs each . These are laid in single straight strands on rocks , corals , aquatic plants , submerged branches and other surfaces . At this point , the eggs are 3 mm ( 0 @.@ 12 in ) in diameter and the egg capsules about 58 @.@ 2 mm ( 2 @.@ 29 in ) in length and 12 @.@ 6 mm ( 0 @.@ 50 in ) in width , on average . 
