Daniela Lopez Betancur
Universidad Autónoma de Zacatecas, Mexico
Biography:
Daniela Lopez Betancur received her MSc degree in engineering sciences from the Universidad Autónoma de Zacatecas (UAZ), México, in 2016. She is currently pursuing her PhD in engineering sciences at the UAZ. Her research interests include optical techniques, holography techniques, LED lighting, aquaculture and biofloc systems.
Abstract:
The present research evaluates the effect of wavelengths of the light on growth rates and survival of Nile tilapia fry with the purpose of improving sustainability in aquaculture production. For this, four treatments were used, three tanks were illuminated with LEDs lamps with the following wavelengths: Blue (BT) with λ=451.67 nm, Green (GT) with λ=513.33 nm and Red (RT) with λ=627.27 nm. Light intensity was kept constant at 0.832 mW/〖cm〗^2 and they had a photoperiod of 18L:6D throughout the study. Besides, a four tank was illuminated only by the natural light (NT), which had the function of witness tank. Each treatment included four one, were randomly assigned 150L tanks that were stocked with 100 Nile tilapia fry. The Nile tilapia fry had an initial average weight of 0.27±0.01 g and were grown for 76 days. The average final weight for BT, GT, RT and NT treatments were 11.54 g,16.84 g,17.27 g 11.54g and 16.22 g, respectively. Feed conversion ratio was better in RT and NT treatments. Survival for BT, GT, RT and NT treatments were 84.68%, 59.85%, 95.48% and 74.33%, respectively.
The results suggest that Nile tilapia fry was positively affected by the Red wavelength, which was represented in a greater mass gain and a remarkable percentage of survival.