Effects of Colored Light on Growth and Nutritional Composition of Tilapia, and Biofloc as a Food Source

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.

The effects of LED light spectrum manipulation on growth and color performance of giant gourami Osphronemus gouramy Lacepede Padang strain

“…Light intensity, spectrum, light duration, and photoperiod can be organized to control the fish growth (Heydarnejad et al, 2013;Lopez-Betancur et al, 2020). The lowest CV value was obtained from the blue LED treatment which indicates that the blue light can suppress the stress level in giant gourami Padang strain, therefore the energy gained from the feed can be utilized optimally for growth.…”

Mixed culture microorganisms fermented soybean meal improves productive performance and intestinal health of Nile tilapia ( Oreochromis niloticus ) juveniles fed plant‐based diets in a biofloc system

“…The animals were fed once a day (12 p.m.) with an initial feeding rate of 10% of the biomass/day until they reached twice their initial weight (Lopez‐Betancur et al, 2020). Subsequently, a rate of 5% of biomass/day was maintained until the end of the experimental period (Lopez‐Betancur et al, 2020). The monitoring of the animals' biomass was carried out every 18 days through biometrics of all experimental units.…”

“…previous Nile tilapia cultures in the BFT system and nonchlorine water until completing the useful volume of 70 L. For the formation and maintenance of the microbial community and suitable conditions of the culture medium, a C:N ratio of 10-15:1 was maintained(Pérez-Fuentes et al, 2016) with sugarcane molasses being used as an external source of carbon. Thus, a biomass of 2.25 kg m −3 of tilapia was also maintained in each macrocosm, fed with commercial feed (32% CP supplied one time per day at 12 p.m.).The animals were fed once a day (12 p.m.) with an initial feeding rate of 10% of the biomass/day until they reached twice their initial weight(Lopez-Betancur et al, 2020). Subsequently, a rate of 5% of biomass/day was maintained until the end of the experimental period(Lopez-Betancur et al, 2020).…”

“…Thus, a biomass of 2.25 kg m −3 of tilapia was also maintained in each macrocosm, fed with commercial feed (32% CP supplied one time per day at 12 p.m.).The animals were fed once a day (12 p.m.) with an initial feeding rate of 10% of the biomass/day until they reached twice their initial weight(Lopez-Betancur et al, 2020). Subsequently, a rate of 5% of biomass/day was maintained until the end of the experimental period(Lopez-Betancur et al, 2020). The monitoring of the animals' biomass was carried out every 18 days through biometrics of all experimental units.Water temperature, dissolved oxygen (Alfakit™ oximeter, model AT170) and pH (Alfakit™ pH metre, model AT315) were measured daily as indicators of water quality.…”

Fiber optic system to measure adulteration in liquids using an RGB detection

“…This allows POF sensors to measure different types of physical properties, such as temperature, viscosity, concentration, and refractive index of a solution. Additionally, other POF sensors have been applied to measure changes in color intensity, ultra-violet radiation, temperature, food and fruit ripening [4][5][6][7][8][9][10].…”