Ecología trófica de la doncella (Ageneiosus pardalis Lütken, 1874) en la cuenca del Río Sinú, Colombia

Abstract

Objetivo. Se estudió la ecología trófica de la doncella (Ageneiosus pardalis Lütken, 1874) en la cuenca del río Sinú entre enero y diciembre 2002. Materiales y Métodos. El contenido estomacal se evaluó con el coeficiente de vacuidad, grado de llenado, grado de digestión, frecuencia de ocurrencia, frecuencia numérica, gravimetría, índice de importancia relativa (IIR) y la relación longitud intestinal (LI)-longitud total (LT). Resultados. El 58.3% de los estómagos se encontró vacío y el 6.4% de las presas en estado fresco. Se identificaron cuatro ítems alimenticios: peces, crustáceos, insectos y otros. Peces fue el ítem más frecuente (46.5%) y abundante (44.7%) con especies como cocobolo, yalúa, cachana, chipe y sardina, y con mayor composición en peso (85.7%). Conclusión. El índice de importancia relativa (IIR) alcanzado por peces (40.0%), indican que la doncella es un pez carnívoro, con tendencia piscívora.

Nutritional value of fatty acids of the Neotropical freshwater fishes <em>Prochilodus magdalenae, Pseudoplatystoma magdaleniatum</em> and <em>Ageneiosus pardalis</em>

“…Linolenic acid (18:3 n-3) was not detected in P. magdaleniatum or P. magdalenae, which is in agreement with a previous report on P. magdaleniatum (Perea et al, 2008). Polyunsaturated fatty acids n-3 were not detected in A. pardalis, which may reflect preferences in the diet, mainly composed of other fish, occasionally crustacean, insects and other trophic groups (Tobías-Arias et al, 2006).…”

“…The freshwater fishes Prochilodus magdalenae (bocachico), Pseudoplatystoma magdaleniatum (catfish) and Ageneiosus pardalis (doncella) are the most highly-demanded Colombian species because of the quality of their meat, size, and taste. These species differ in their feeding preferences, while P. magdalenae is detritivorous (Bowen, 1983, Flecker, 1996, P. magdaleniatum (Jiménez-Segura, 2009) and A.pardalis (Tobías-Arias et al, 2006) are carnivorous.…”

“…The information about fatty acid composition is unknown for A. pardalis and scarce for P. magdalenae and P. magdaleniatum since only nine of the more abundant fatty acids have been characterized in the two latter species (Perea et al, 2008). Moreover, it remains to be explored whether the content of fatty acids and its consequent nutritional value vary according to migratory seasons and whether such variation is associated with the breeding/trophic cycles of these species (Bowen 1983, Flecker 1996Jiménez-Segura, 2009;Tobías-Arias et al, 2006). Therefore, this study aimed to determine the nutritional value based on the content of the fatty acids of P. magdaleniatum, P. magdalenae and A. pardalis in dry and rainy seasons, with a view to orient their commercial use and conservation strategies.…”

Taxonomic revision of the South American catfish genus Ageneiosus (Siluriformes: Auchenipteridae) with the description of four new species

“…Atencio-García et al (2005) recorded fishes and macrocrustaceans in the diet of A. pardalis. Tobías-Arias et al (2006) observed that A. pardalis feeds mainly on fishes, crustaceans and insects, in addition to other items identified by the authors as plant remains and unidentified material.…”

“…Tobías‐Arias et al . () observed that A . pardalis feeds mainly on fishes, crustaceans and insects, in addition to other items identified by the authors as plant remains and unidentified material.…”