ميزان تخم گشايي سيست آرتميا اورميانا (Artemia urmiana) در شدت هاي نوري متفاوت

Hatching rate of Artemia urmiana cysts in different light intensities

The present study has been conducted to determine the effect of different light intensities on Artemia urmiana cysts hatchability. The effect of seven light intensities consisting darkness, 500, 1000,1500, 1700, 2000, 2500 Lux were assessed, each treatment had three replicates. All factors affecting cysts hatching were constant except illumination. 24 hours after incubation the number of nauplii, umbrella stage and unhatched cysts were counted and hatching percentage determined. According to results the hatching percentage was significantly higher than other treatments, and the less hatching was occurred in darkness. Illumination is one of the most important factors in artemia cyst hatching, and the light intensity should be about 2000Lux during Artemia urmiana incubation.