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One hypothesis is that density-dependent mortality regulates juvenile salmonine populations , and can occur both intra - and inter-specifically ; that is to say , high densities of juvenile Atlantic salmon and / or steelhead fry can depress salmon survival rates . During this trans-oceanic voyage , the first Atlantic crossing by a monitor-type ironclad , Miantonomoh was partially towed by the Augusta , though it was claimed she could have made the entire crossing under her own power . For my dissertation , I am examining survival and growth of stocked juvenile Atlantic salmon in several tributaries in the Lake Ontario watershed , as well as investigating competition between Atlantic salmon and steelhead juveniles . In a Georgia study , 97 of 1,534 tagged juvenile Atlantic sturgeons and 12 of 551 tagged shortnose sturgeons were reported recaptured in commercial nets . Female leatherback sea turtles nest from southeastern United States to southern Brazil in the western Atlantic and from Mauritania to Angola in the eastern Atlantic . Combining growth rates with survival , total Atlantic salmon biomass varied between sites , but did not change over the sampling season . A tropical depression became Hurricane Ivan which was the first in a trio of hurricanes to form and then remain over the eastern Atlantic Ocean during the latter part of September . But to assume that the negative side-effects will necessarily outweigh the advantages is to succumb to the seeds of doubt planted by the West , which is wary of the emergence of a formidable anti-North Atlantic Treaty Organization counterweight via the SCO . At this time the null hypothesis of a total Atlantic stock of white marlin , a model which is also supported by observations on the distribution , spawning , and movements of the species , cannot be rejected . DNA was purified from 182 fish from the western Atlantic and 134 fish from the eastern Atlantic . The strongest hurricanes in the Atlantic ( categories 3-5 ) are usually associated with AEW 's ( Landsea , 1993 ) that show clear signs of development in the eastern Atlantic ; these are know as " Cape Verde " storms , after the islands just west of the African coast , close to where these storms first become apparent in satellite imagery .