| Abstrakt: |
Artificial light in various spectral is a relatively new development for modifying the environment of fish. According to research, light has a spectral and species-specific effect on fish.. As a result, the goal of this study was to see how different visible light colors affected Clarias gariepinus growth and digestive enzymes. 105 Juvenile fish (body length 10.00 ± 0.55 cm, initial weight 8.67 ± 0.62 g) were randomly exposed in triplicate to the following LEDs: Red (RL), Blue (BL), Green (GL), and Yellow (Y). Total Darkness (TD) and Ambient Light (AL) were used as controls. The fish were exposed for 12 hours overnight for 50 days. At five-day intervals, the fish's body weights were measured with an electric weighing scale (0.01g sensitivity); head length (cm), tail length (cm), and total body length (cm) were measured with a graduated measuring plastic box. The variables listed below were computed: Weight Gain (WG), Daily Weight Gain (DWG), Daily Growth Rate (DGR), Specific Growth Rate (SGR), Percentage Weight Gain (PWG), Food Conversion Ratio (FCR), Length Gain (LG), Daily Length Gain (DLG), Survival Rate (SR) and Condition Factor are some of the metrics used to calculate weight gain. Standard methods were used to measure the activities of digestive enzymes (proteinase and amylase). ANOVA was used to compare the acquired means, and Duncan's multiple range tests were used to further separate the means. Fish reared in YL had significantly higher WG, DWG, DGR, PWG, DLG, LG, and CF levels. SR of fish reared under TD conditions was the lowest, but it was significantly (P < 0.05) higher in fish reared under YL and RL conditions. Fish exposed to YL had significantly higher FCR and CF than those exposed to the other light treatments and the Control. The digestive enzyme activities were significantly (P < 0.05) reduced during the light treatment. Finally, nighttime artificial light exposure had a significant impact on juvenile catfish growth performance and digestive enzymes, with yellow light eliciting better growth performance. [ABSTRACT FROM AUTHOR] |
