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Encyclopedia Britannica - Main :: SIV-SOU |
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SOUTHERN ZONE .The boundaries of this zone have been indicated in the description of the equatorial zone ; they over-lap the southern boundaries of the latter in South
South
Tasmania
freshwater
Land
The Tropical American region is the richest (about 1300 species) ; next follow the African
North
Of the migratory fishes, or fishes travelling regularly from the sea to fresh waters, most, if not all, were derived from marine forms. The anadromous forms, annually or periodically ascending rivers for the purpose of spawning, such as several species of Acipenser, Salmo, Coregonus, Clupea (shads), and Petromyzon, are only known from the northern hemisphere, whilst the catadromous forms, spending most of their life
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