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Sostoa (1989)
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Introduction The Twaite shad ( Alosa fallax , Lacepède, 1803) historically was found in the rivers of Europe, from southern Norway to the eastern Mediterranean Sea, although it is now a threatened species in much of its former range ( Sostoa and Lobon‐Cervia, 1989 ; Elvira, 1995 ). In Spain, significant populations once existed in the Guadalquivir and Ebro rivers; however, the fishery for this species in the Ebro River is poorly documented with only anecdotal information on captures and landings existing. Beginning in the 15th century with the construction of the weir at Xerta, multiple barriers in the form of dams have been constructed at Flix in 1945, at Mequinenza in 1964, and at Ribarroja in 1967. Restricted upstream access together with pollution has resulted in the near extirpation of all anadromous species from the Ebro River. Since the closure of the Twaite shad commercial fishery in the 1970s, the species was considered to be locally extinct ( Aprahamian et al., 2003 ). Between 2001 and 2005 accidental captures of Twaite shad reported by anglers downstream of the Xerta weir provided evidence of a nascent recovery of this population in the Ebro River ( López et al.,
Journal of Applied Ichthyology – Wiley
Published: Dec 1, 2011
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