Resumen

B. FURUYA, Valéria R; HAYASHI, Carmino; FURUYA, Wilson M  y  SAKAGUTI, Eduardo S. Replacement rates of carbon stable isotope (¹³C) in muscle tissue of pintado, Pseudoplatystoma corruscans (Agassiz, 1829). Zootecnia Trop. [online]. 2002, vol.20, n.4, pp.461-472. ISSN 0798-7269.

This work was undertaken out to the evaluate the replacement rates of carbon stable isotope (¹³C) in the muscle tissue of Pseudoplatystoma corruscans, during the juvenile stage is provided, based on the hypothesis that the consumer reveals its diet isotopically. Four hundred and eighty pintados, average life weight 0.71 ± 0.13 g and 45 days old, were distributed in 24 - 14 l aquariums. Previous to the experimental period and since the start of exogenous feeding, the fish were fed on nauplii artemia. After they were fed on post-larval guppies (Poecilia reticulata) for 13 days. Two fish from each aquarium were collected for d ¹³C analysis. Exponential model for muscle tissue of the pintado estimated a half-life equal 4.38 days. Exchanging time for 99% of carbon diet amounted to 29.91 days. Since results show that consumer reveals isotopic composition by its diet, the use of carbon stable isotope is validated in so far as time of substitution is concerned.

Palabras clave : ¹³C; muscle tissue; pintado; Pseudoplatystoma corruscans; replacement; stable isotope.