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Lampreys and Hags
Sharks and Eays and Early Cartilaginous Pishes
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Africa allied America anadromous Antaretica appear Aretic Aretic Ocean Baltic bathypelagic Bay of Biscay Black Sea British Isles Caspian Cattegat caught Channel coast of Norway common Cretaceous deep water demersal denatant migration denatantly depths east eels eggs measure Eocene Europe evidently Faroes fathoms fins fish Fisheries fresh water fresh-water genera genus Greenland growth Gulf habit hatched Iceland immature Indian Ocean inshore Japan June Lake Baikal lakes lampreys large numbers larvae Leptocephalus mackerel male Mareh marine mature Mediterranean Miocene North Atlantic North Sea north-east Atlantic northern Norway Norwegian obtained oil globule Oligocene Pacific pelagic pelagic eggs pelvic fins period plaice planktonic Pliocene probably region rivers salmon Scotland seasonal migration shallow water shore Siberia Skagerak southern spawning ground spawning migration spawning season spawning shoal spawning takes place species specimens summer surface Tertiary tropical Atlantic trout west coast winter rings yolk young stages