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Zootecnia Tropical
Instituto Nacional de Investigaciones Agrícolas Venezuela
ISSN: 0798-7269
Vol. 20, No. 4, 2002, pp. 461-472
Bioline Code: zt02029
Full paper language: English
Document type: Research Article
Document available free of charge

Zootecnia Tropical, Vol. 20, No. 4, 2002, pp. 461-472

 es Taxas da recolocação do isotope estável do carbono (13C) no tecido do músculo do pintado, Pseudoplatystoma corruscans check for this species in other resources (Agassiz, 1829)
Valéria R. B. Furuya, Carmino Hayashi, Wilson M. Furuya and Eduardo S. Sakaguti

Resumen

Este estudo foi realizado com o objetivo de avaliar a taxa de substituição do isótopo estável de carbono (13C) no tecido muscular do pintado, Pseudoplatystoma corruscans check for this species in other resources , na fase juvenil, baseado na hipótese de que o consumidor reflete isotopicamente sua dieta. Foram utilizados 480 juvenis de pintados, com peso vivo médio de 0.71 ± 0.13 g e 45 dias de vida após eclosão, distribuídos em 24 aquários de 14 l. Antes de iniciar o período experiemental e desde o início da alimentação exógena, os peixes foram alimentados com náuplios de artemia. Após este período foram alimentados com pós-larvas de lebistes ( Poecilia reticulata check for this species in other resources ) por 13 dias. Foram coletados dois peixes de cada aquário para análise de d 13C. Pelo modelo exponencial, obteve-se uma meia-vida para o tecido muscular do pintado de 4.38 dias. O tempo de substituição de 99% do carbono da dieta foi de 29.91 dias. Os resultados demonstraram que o consumidor reflete a composição isotópicas de sua dieta, validando o uso do isótopo estável de carbono como marcador de carbono.

Palabras-clave
13C, isótopo estável, pintado, Pseudoplatystoma corruscans check for this species in other resources , substituição, tecido muscular

 
 en Replacement rates of carbon stable isotope (13C) in muscle tissue of pintado, Pseudoplatystoma corruscans check for this species in other resources (Agassiz, 1829)
Valéria R. B. Furuya, Carmino Hayashi, Wilson M. Furuya and Eduardo S. Sakaguti

Abstract

This work was undertaken out to the evaluate the replacement rates of carbon stable isotope (13C) in the muscle tissue of Pseudoplatystoma corruscans check for this species in other resources , 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 check for this species in other resources ) 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.

Keywords
13C, muscle tissue, pintado, Pseudoplatystoma corruscans check for this species in other resources , replacement, stable isotope

 
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