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Investigaciones marinas

versión On-line ISSN 0717-7178

Resumen

SIELFELD K., Walter  y  VARGAS F., Mauricio. Composition and structure of the demersal ichtyofauna in northern Chile. Investig. mar. [online]. 1996, vol.24, pp.03-17. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71781996002400001.

The species composition and structure of the demersal ichtyofauna of the northern Chile (18º24'-21º26'S) was studied. 50 fish species, belonging to 16 orders and 31 families were recorded. The distribution range of the following species extends south to the study area: Dibranchus spinosa, Cherublemma emmelas, Pachycara suspectum and the northern distribution range of Centroscyllium granulatum. The best represented families were Macrouridae, Ophidiidae and Zoarcidae (6, 5 and 4 species, respectively). The most abundant families were Macrouridae and Ophidiidae (46% and 21%, respectively) and the most abundant species Trachyrhynchus helolepis (33%), Cherublemma emmelas (21%) and Trachyrhynchus villegai (8%). The most frequent species were Coryphaenoides ariommus (69%) and Trachyrhynchus helolepis (56%). The bathymetric distribution shows a shallow-demersal species group (0-100 m) and deep-demersal species group (100-1000 m), the last with three different bathymetric levels: 200-500, 500-700 y 700-1000 m. The latitudinal distribution of the fish species showed the existence of a transition between the fish associations of the continental shelf and slope off Panama-Peruvian and central Chile, belonging the dominant elements to the first one.

Palabras clave : demersal; northern Chile; specific composition; bathymetrical and latitudinal distribution.

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