Physico-chemical variables are given in Table 1. Values of environmental
variables fluctuated in the artificial pond during the present study. Tukey's HSD test showed that there were significant differences
(p b 0.05) among the environmental variables during study period.
Water temperature one of environmental variable changed from 4 to
32 °C for N3 (3rd week of November) and A4 (4th week of August), respectively.
There was not significant change in water temperature
among the summer months. However, significant differences were determined
among fall's months. Dissolved oxygen (DO) values showed a significant
variation (p b 0.05) in the pond and increased at theweeks of fall.
Significant differences (p b 0.05) in conductivity and total dissolved solid
(TDS) values were found in the pond. Both mentioned variables
decreased at A1 (the first week of August), A3 (3rd week of August)
and S3 (3rd week of September). This could be due to addition of tap
water and precipitation. Salinity and pH values changed from 0.18 to
0.45 ppt and from 6.74 to 9.51, respectively. Alkalinity of water in the
pond had changed to basic. A similar result was also found in a freshwater
pond in Japan [37].