Effect of different light intensity at continuous photoperiod on growth of rainbow trout (Oncorhynchus mykiss)

Subject Areas : New Technologies in Aquaculture Development

sahebali ghorbani ¹ (کارشناس ارشد تغذیه در ایستگاه تحقیقاتی تخصصی تغذیه و غذای زنده آبزیان پژوهشکده آبزی پروری آبهای داخلی کشور- بندرانزلی)

Received: 2023-01-09 Accepted : 2023-01-09 Published : 2023-02-20

Keywords: growth, Rainbow trout (Oncorhynchus mykiss), Keywords: Light intensity, Continuous light,

Abstract :

Abstract[1]This investigation was conducted to determine optimal light intensity of continuous photoperiod (24L/0D) at Research Station of aquatics nutrition and live food, located at Bandar Anzali in 2008-2009 for 60 days. The trial was carried out in 12 fiberglass tanks with a water volume of 80L, with flow rate of 0.8 l/min, and fish stocked at rate of 20 fish/tank with average initial weight of 12-13 gr. The design of the experiment consisted of 4 treatments with triplicates which included light intensity 100 Lx, 200 Lx, 300 Lx, and 400 Lx. The experimental fish fed on commercial food of FFT and GFT for the weight groups of 12-30, 30-50 gr respectively. The statistical analysis indicated that with increasing of light intensity growth rate increased from 100 Lx to 400 Lx but the Weight gain (%), Specific growth rate, Food conversion ratio, Condition factor and Survival (%) were not significantly different among all treatments (P>0.05). The statistical analysis did not show significant difference among all treatments. The results of this experiment showed that the best growth rate and optimal food conversion ratio was obtained from light intensity 300-400. *- Corresponding Authors; Email: [e-mail]