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In page Smooth lanternshark:

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The smooth lanternshark feeds on squid, lanternfishes, smaller dogfish sharks, and fish eggs, as well as crustaceans and fish.[1] [2] This species is ovoviviparous, with the developing embryos being sustained by a yolk sac. Females produce an average of 10 young per reproductive cycle.[3] Males reach sexual maturity at a length of 31–39 cm (12–15 in), and females at a length of 38–47 cm (15–19 in).[1] The length at maturity varies with geographical region, with sharks in the western Atlantic maturing larger than those from off KwaZulu-Natal.[4] This species grows at a slow rate, with the body becoming relatively longer with age. Off southern Portugal, males live to at least 13 years of age, and females to at least 17 years.[5][3]