An experimental survey of freshwater shrimp upstream migration in an impounded stream of Guadeloupe Island, Lesser Antilles
Archiv für Hydrobiologie Volume 144 Number 3 (1999), p. 339 - 355
published: Mar 5, 1999
ArtNo. ESP141014403008, Price: 29.00 €
Experimental trapping fishways (FWs) were used to investigate the population structures of migrating shrimps (Crustacea, Decapoda, Caridea) at two valley dams (150 and 320 m a.s.l.) in Bananier River, Guadeloupe Island, Lesser Antilles. Eight of the nine species recorded by electrofishing (EF) in dam vicinities were also captured in FWs. Migrating shrimp numbers varied versus time and an overall peak of migration occurred on about the 25th day of experimentation. At both dams the effect of FW location on numbers captured demonstrated the importance of attraction by water discharge during the upper migration of shrimps. Three species dominated the shrimp fauna of Bananier River: Macrobrachium faustinum, Micratya poeyi and Atya innocous. Mainly small (juvenile and subjuvenile) individuals migrated in the first two species, which inhabit stream reaches lower than 250 m a.s.l., whereas juvenile and mature ones migrated in the third species which inhabits headwaters.