Photoperiod Manipulation Stimulated Growth Performance in Young Striped Knifejaw, Oplegnathus fasciatus

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  • 光周期によるイシダイの成長促進効果

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[Abstract] This study was aimed to investigate whether photoperiod manipulation can be used to stimulate the growth performance without stress response in striped knifejaw Oplegnathus fasciatus with 280-350g body weight. Fish were fed a commercial diet to apparent satiation, two times a day for 9 weeks. Blood was also collected from the initial fish. Although there was no major variation in weight gain, specific growth rate, feed intake and feed conversion efficiency between 16L:8D and 24L:OD photoperiods, all parameters in these photoperiods were remarkable higher than those of 12L:12D photoperiod. There was no major difference in final whole body proximate composition among the treatments; however, retentions efficiencies of protein and energy, HSI and VSI in fish under 16L:8D photoperiod were remarkable higher than those of 12L:12D photoperiod. At the end, the plasma levels of cortisol, glucose and total protein in fish under the artificial photoperiods were similar to those of initial levels. The results demonstrated that the artificial photoperiod 16L:8D can be used to enhance the growth performance of 0. fasciatus without causing significant stress response.

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