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ORINOQUIA

On-line version ISSN 0121-3709

Abstract

ORTEGA, Johana P.  and  YOSSA, Martha I.. Productive performance of coporo with isotopic diets. Orinoquia [online]. 2014, vol.18, suppl.1, pp.278-285. ISSN 0121-3709.

The detritivorous fish are the base of the food chain and are widely distributed in neotropical basins, Prochilodus are representative of this group and bocachico llanero or coporo (Prochilodus mariae) is of commercial interest in aquaculture. This study aimed to evaluate the productive performance in fingerlings coporo with isotopic diets were comprised two treatments: commercial diet (δ 13C -20.93±0.34) and experimental diet (δ 13C -24.6±0.9) supplied for sixty days. Mean weight, mean standard length, weight gain (WG), specific growth rate (SGR) and feed conversion ratio (FCR) were determined. The contribution and fractionation of the diet were estimated from isotopic values muscle samples. The weight and length standard of coporo was more than in the treatment of the commercial diet (CD). In the WG and SGR parameters was significant difference (P< 0.05) between treatments, with the CD treatment better compared to the experimental diet (ED). The relative contribution of CD and DE were 59.2 and 53.4% respectively, in isotopic fractionation of carbon and nitrogen diet of ED was 1.97 and 1.14%0 respectively. The relation between the contribution of diet and weight gain was most efficient CD in terms of carbon contrary, nitrogen efficiency was with ED. Although the contribution of the diets was less than 60%, both contributed to improving the performance of coporo.

Keywords : Isotopic fractionation; Prochilodus mariae; SGR; Stables isotopes.

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