Karim Golshahi; Abdolrahim Vosoughi; Abolghasem Esmaeili Fereidoni; Valiollah Jafari Shamoshaki; Aliakbar Pasandi Yasaghi
Volume 10, Issue 1 , September 2012, , Pages 78-86
Abstract
The effect of light intensity and photoperiod on growth and survival of juvenile Fenneropenaeus indicus shrimp was investigated for 40 days. After adaptation, 3 months juvenile shrimps with initial mean weight 8.13±0.20g were stocked (12 shrimps/tank) in 300 liters fiberglass tanks. Two light ...
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The effect of light intensity and photoperiod on growth and survival of juvenile Fenneropenaeus indicus shrimp was investigated for 40 days. After adaptation, 3 months juvenile shrimps with initial mean weight 8.13±0.20g were stocked (12 shrimps/tank) in 300 liters fiberglass tanks. Two light intensities (50 lx,1500 lx) with two photoperiods (24L/0D, 12L/12D) were provided in four treatments (50 lx, 24L/0D; 50 lx, 12L/12D; 1500 lx 24L/0D; 1500 lx, 12L/12D ) useing fluorescent lamps.Water temperature and salinity were maintained between 29 and 310C and 25-26 ppt, respectively. The results indicate that maximum and minimum SGR occurred under 50 lx, 24L/0D and 1500 lx, 24L/0D, respectively(P<0.05). The treatment 50 lx, 12L/12D had the second highest SGR between treatments. However, no significant differences in SGR was found between 50 lx, 12L/12D and other treatments (P>0.05). Light intensity and photoperiod did not significantly affect survival of juvenile shrimp (P>0.05). Our study suggest that light intensity of 50 lx provide conditions for better growth rate and photoperiod could be adjusted to 12 or 24 h light.