Abstract
The study aimed to evaluate the effect of modified photoperiods and light intensities on grow-out production of tilapia under indoor tank culture system; specifically on water quality and on growth performance of tilapia. The study was conducted inside the greenhouse and considered two factors: photoperiod (24L:0D, 20L:4D and 16L:8D); and light intensity (40 watts m-2, 60 watts m-2 and 80 watts m-2); also, a control treatment was set-up outside the greenhouse to receive the normal environmental condition. Light manipulations inside the greenhouse were able to sustain the water quality within the desirable level for tilapia cultured in tank; while control tanks shows high water quality variation. Growth performance of tilapia cultured in tank responds positively in prolonged photoperiod at different light intensities. However, light manipulation gave insignificant difference on feed conversion ratio and survival rate compared to normal condition. Results indicated that 20-hours photoperiod and 40 watts m-2 light intensity is just enough to sustain the recommended water quality and better growth performance of the cultured tilapia in indoor tank system. It can be concluded that longer photoperiod and restrained light intensity can improved the growth performance of tilapia under indoor tank culture.
Highlights
Aquaculture is affected by the impact of climate change such as increasing temperature and sudden changes in local weather condition that can cause low production or leading to fish kill
Good water quality is essential for growth and survival of the cultured species, and it must be monitored regularly to serve as guide for managing the aquaculture
Results showed that the average un-ionized ammonia during the initial stage of the growing period were above the desirable level in all light manipulation and control treatment tanks, but for the succeeding growing periods, it was within the acceptable level [4]
Summary
Aquaculture is affected by the impact of climate change such as increasing temperature and sudden changes in local weather condition that can cause low production or leading to fish kill. One of the major concerns in indoor production is the absence of sunlight; and currently, some information is available concerning the effects of artificial photoperiod and light intensity on the growth performance of tilapia for indoor tank culture. This study generally aimed to devise modified photoperiods and light intensities for grow-out production of Nile tilapia (Oreochromis niloticus) under indoor tank culture system. It aimed to: evaluate the effect of light manipulation on water quality and to analyze the effect of photoperiods and light intensities on the growth performance of tilapia under indoor tank culture system
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