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Gayana (Concepción)

Print version ISSN 0717-652XOn-line version ISSN 0717-6538

Abstract

PALMA, Alejandro et al. COMPOSITION OF THE DIET OF ONCORHYNCHUS MYKISS (WALBAUM 1792) (PISCES: SALMONIDAE) IN A RIVER SYSTEM OF LOW ANTROPOGENIC ACTION: NONGUEN STREAM, VIII REGION, CHILE. Gayana (Concepc.) [online]. 2002, vol.66, n.2, pp.129-139. ISSN 0717-652X.  http://dx.doi.org/10.4067/S0717-65382002000200007.

The diet of O. mykiss (Walbaum 1792) in a fluvial ecosystem with low anthropic intervention was studied, determining if there is correspondence between items consumed by the fish and the nourishing supply. The study area corresponds to Nonguen stream, a tributary coastal subriver basin of the inferior course of Andalien river (36° 49' - 57' 36° 54'S; 72°- 73° 01'W), with a general direction of the South to North, crossing a distance more than 15 km with a watershed of 44 km2. The study was carried out by means of electrical fishing in two seasonal periods: winter and spring. Along a linear sequence of 5 sampling stations located in ritron and potamon sectors in the first 5 kilometers of the stream. The identified throfic spectrum consists of 30 taxa, composed basically by larvae of Ephemeroptera, Plecoptera, Trichoptera and Diptera. The diet between stations is similar (ISP 50%) indicating that Oncorhynchus mykiss behaves as a generalist predator (Spearman rs = 0,45 p<0,05).

Keywords : Oncorhynchus mykiss; diet; Nonguen creek; VIII Region; Chile.

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