Abstract
Light stimulation and biofloc technology can be combined to improve the efficiency and sustainability of tilapia production. A 73-day pilot experiment was conducted to investigate the effect of colored light on growth rates and nutritional composition of the Nile tilapia fingerlings (Oreochromis niloticus) in biofloc systems. The effect of colored light on the nutritional composition of bioflocs as a food source for fish was measured. Three groups were illuminated in addition to natural sunlight with colored light using RGB light emitting diodes (LEDs) with peak wavelengths (λ) of 627.27 nm for red (R), 513.33 nm for green (G), and 451.67 nm for blue (B) light. LED light intensity was constant (0.832 mW / cm 2 ), and had an 18-h photoperiod of light per day throughout the study. The control group was illuminated only with natural sunlight (natural). Tilapia had an average initial weight of 0.242 g. There was a significant effect of colored light on tilapia growth and composition. The R group showed the best growth rate, highest survival, and highest lipid content. The B group showed homogeneous growth with the lowest growth rate and lipid content, but the highest protein level. On the other hand, the biofloc composition was influenced by the green light in the highest content of lipids, protein, and nitrogen-free extract.
Highlights
Aquaculture is one of the fastest-growing food production areas and it is one of the most important sources of food, nutrition, income, and livelihood for hundreds of millions of people worldwide [1].By 2030, the production of freshwater species such as carp, catfish, and tilapia is expected to represent about 60% of total aquaculture production [2,3]
The experimental design and the fish-use protocol were approved within the project “light emitting diodes (LEDs) lighting to improve the production of tilapia in biofloc systems” by the ethics committee for animal research at the “Autonomous University of Zacatecas”
We studied the effect of colored light in Nile tilapia fingerlings and bioflocs, the R
Summary
By 2030, the production of freshwater species such as carp, catfish, and tilapia is expected to represent about 60% of total aquaculture production [2,3]. Fish farming requires the use of land, freshwater, and environmental resources, which are increasingly scarce and expensive worldwide. 2050, the demand for water is expected to increase by 55% in all sectors of production [4]. An increase in aquaculture production must be carefully planned, minimizing the environmental impact and optimizing the use of natural resources. Sustainable aquaculture systems produce more fish without affecting the environment, such as using biofloc technology (BFT). In systems with BFT, there are limited exchanges of water
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