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Potential fecundity of twaite shad Alosa fallax fallax (Pisces: Clupeidae) from the upper estuary of the river Mira (SW Portugal): preliminary results
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Resumo(s)
The great majority of European anadromous fishes are threatened species (Leleck, 1980). Despite the existing legal protection for migration fishes, these are vulnerable and particulary threatened by antropogenic impact, by physical obstacles for migrating fish and by physical impacts on spawning and nursery areas.
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Potential fecundity Stereological method