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Updated: Jan 7, 2026

Incremental Temperature Changes for Maximal Breeding and Spawning in Astyanax mexicanus
Published on: February 14, 2021
Light wavelength affects ontogeny, survival and intraspecific predation in larvae of matrinxã, Brycon amazonicus
Reinaldo Luzeiro Muller1, Ana Caroliny Cerdeira Lopes1, Bruno Olivetti de Mattos2
1Federal University of Amazonas (UFAM), Manaus, Brazil.
Abstract:
The light spectrum influences fish physiology and behaviour. This study assessed the effects of light on development, survival and intraspecific predation in matrinxã larvae (Brycon amazonicus). Larvae (6-50 HAH, 200 larvae/L) were exposed to darkness, white, red, blue or green light. Darkness resulted in slower development but higher survival and lower stress, whereas red light increased mortality. Darkness delayed morphological changes linked to aggression and cannibalism, improving survival. Dark conditions optimized growth by reducing aggressive interactions. Light manipulation during B. amazonicus rearing enhances larval welfare and supports sustainable Amazonian aquaculture.
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