Journal of Dalian Ocean University  2023, Vol. 38 Issue (5): 787-794 DOI: 10.16535/j.cnki.dlhyxb.2023-018 |
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| Effects of light color, light intensity and photoperiod on growth and feeding of juvenile turbot (Scophthalmus maximus) |
| HAN Jian，WANG Maolin，CAO Shengnan，GU Zhizhi，SUN Xu，WANG Wei*
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| 1.College of Fisheries and Life Science，Dalian Ocean University，Dalian 116023，China；2.Key Laboratory of Fish Applied Biology and Aquaculture in North China，Liaoning Province，Dalian Ocean University，Dalian 116023，China |
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Abstract In order to evaluate effects of light environment (light color, light intensity and photoperiod) on growth and feeding of juvenile turbot (Scophthalmus maximus) during culture, juvenile turbot with initial body weight of (3.17±0.07)g was reared in a flowing water tank of 85 cm×75 cm×60 cm under cold white, red, blue, green, and warm white LED light, and light intensity of 600, 300, 100, 25 lx and the dark control and photoperiod of 24L∶0D, 16L∶8D, 12L∶12D, 8L∶16D and the dark control at cold white light and water temperature of(18.3±0.5)℃ for 65 days. At the end of the experiment, the survival rate, specific growth rate, feed conversion ratio and the levels of GH, IGF-1, and NPY were comprehensively analyzed. The results showed that there was higher mortality of juvenile turbot in the red light source group, without significant effect of the light color, light intensity and photoperiod on the survival rate (P>0.05). The juvenile turbot had significantly lower growth and feeding performances in red light source group than those in cold white and green light source groups (P<0.05). The growth and feeding performances of juvenile turbot were shown to be significantly higher in 300 and 100 lx groups than those in 600 lx group (P<0.05). The juvenile turbot had significantly lower growth and feeding performances in continuous light group (24L∶0D) than those in 12L∶12D, 8∶16D and dark control groups (P<0.05). The findings suggest that the use of red light be avoided during the culture of juvenile turbot. The low light intensity (25-300 lx) is suitable for the growth and feeding of juvenile turbot, while the high light intensity inhibits the growth and feeding. The short photoperiod (0-12 h light) appears to be more conductive to the growth and feeding of juvenile turbot than long photoperiod.
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Published: 08 November 2023
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