Feeding trials of Pangasius hypophthalmus larvae, during the first 2 weeks post hatching

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Casillas-Maldonado, Jorge I.
Embargoed Until
Kubaryk, John M.
College of Arts and Sciences - Sciences
Department of Marine Sciences
Degree Level
A high mortality in the first two weeks after hatching makes Pangasius hypophthalmus culture challenging. Some scientists have attributed this mortality event to cannibalism and bacterial infection. Larvae were presented with different live feeds at different densities to see if the cannibalistic behavior would be avoided, resulting in higher survival rates during these first two weeks. Five different diets were offered to the larvae for 14 days; rotifers, Artemia nauplii, Tetraselmis 3600, and two different mixes of the aforementioned feeds. Results were inconsistent, with Artemia nauplii having the highest survival rate, mean weight and mean length. The other treatments did not reach 1% of survival rates with poor mean weights and lengths. New research suggests that this mortality problem might be of a morphological nature and not a dietary problem.

Una gran mortalidad ocurre en larvas de Pangasius hypophthalmus durante las dos primeras semanas después de haber eclosionado. Algunos científicos atribuyen estas mortalidades a canibalismo e infecciones bacterianas. A las larvas se les alimentó con diferentes dietas vivas y en diferentes densidades, para ver si estas mortalidades y canibalismo podían mejorar, aumentando así las tasas de supervivencia. Cinco dietas fueron ofrecidas a las larvas durante dos semanas; rotíferos, Artemia nauplii, Tetraselmis 3600 y dos mezclas con los alimentos antes mencionados. Los resultados fueron altamente variables, siendo Artemia nauplii la que obtuvo la mayor tasa de supervivencia, el mayor peso promedio y largo promedio. Los otros tratamientos no lograron llegar a 1% de supervivencia, con pesos y largos promedios pobres. Nuevos estudios sugieren que este problema de mortalidad esta mas relacionado con desarrollo morfológico que con dietas.
Pangasius hypophthalmus--larvae,
Pangasius hypophthalmus--mortality
Casillas-Maldonado, J. I. (2012). Feeding trials of Pangasius hypophthalmus larvae, during the first 2 weeks post hatching [Thesis]. Retrieved from