Author(s):

Ali Razgardani Sharahi¬, Saraqllah Zarei

Abstract: Artemia produces cyst in natural environments and at definite times of the year, but these cysts are inactive. However, they continue the trends in germinal growth by emergence of proper conditions, feeding from the environment. The effect of light and opacity together as the nonliving elements and the effective physical factors are investigated for the first time in this study. In order to find the best conditions for obtaining the highest efficiency and simultaneous hatching as well as the number of cysts of these aquatic animals, with regards to equal conditions in salinity and temperature. Light intensity was not significant on hatching (p=0.053), but it showed significant difference at light intensity of 1000lux (p<0.05). The lowest rate of hatching in 1500 lux light intensity was 17.75+8.62 and the highest rate of hatching was observed to be 25.94+8.3 in treatments with the light intensity of 1000 lux (p=0.032). The effect of turbidity was not significant on hatching (p=0.58)

Pages: 03-06  |  2957 Views  1150 Downloads

Download (347KB)