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Gayana (Concepción)

versión impresa ISSN 0717-652Xversión On-line ISSN 0717-6538


HABIT, Evelyn; VICTORIANO, Pedro  y  PARRA, Oscar. TRANSLOCATION OF NATIVE FISHES IN LAJA RIVER (BIOBIO REGION, CHILE). Gayana (Concepc.) [online]. 2002, vol.66, n.2, pp.181-190. ISSN 0717-652X.

In order to conserve the native ichthyofauna and as mitigation procedure to prevent the impact generated by the interruption of the free displacement of fish in the Laja river (Biobio Region), a translocation program for native fish was carried out. Between the years 1997 and 2000 the species composition, communitary and population structure of the ichthyofauna were studied, determining the need to transfer individuals of three native species with conservation problems: Diplomystes nahuelbutaensis, Trichomycterus areolatus and Percilia irwini. The translocation campaign was carried out in January of the 2001, capturing a total of 1835 fishes, of which 1653 was restocking. The number of survivals of the three species was high during the three phases of the campaign, being upper 90% in each one of them. 852 P. irwini were captured and 760 restocked; 643 T. areolatus were captured and 591 restocked, and 340 D. nahuelbutaensis were captured and 302 restocked. In the three species the highest mortality occurred in the juveniles. T. areolatus and P. irwini showed greater mortality during data recording (weight and body length), while D. nahuelbutaensis resulted more sensitive to the transfer. In all the cases, this mortality was lower to 7%. To enlarge the efficiency of this strategy of conservation we suggested: (a) to avoid the juvenile extractions, (b) to eliminate the phase of taking data of each specimen captured, (c) to reduce the time of fish stored in containers, and (d) to transport the fishes in low densities

Palabras clave : Translocation; Diplomystes nahuelbutaensis; Trichomycterus areolatus; Percilia irwini; Laja river; Chile.

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