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Abstract: In recent years, extension of Artemia applications in aquaculture and decreasing of natural resource, lead many of related studies to the distribution of Artemia population and new resource assessment studies. Urmia Lake as one the biggest habitat for Artemia because of ecological variations in the regions in which of its differentiations in cyst biometry and Artemia, moreover some genetic variations suggested to have some several Artemia populations in the Lake. In this project Artemia cyst samples were collected from 5 ecological stations of the Lake Urmia. The cyst hatching and the nauplii breeding up to adult Artemia stage were done according to optimum conditions in laboratory. Growth rate and survival of larva in days of 3, 5, 7, 11, 15, 20 of rearing period were measured in feeding with a complex of Dunaliella tertiolecta and Lanzy PZ for a period of 20 days in 75 and 150 ppt. Data and its statistical analysis revealed that according to previously records the growth rate of the Artemia was influenced by increasing the salinity from 75 to 150 ppt survival and growth rate of Artemia have been influenced by water salinity (P<0.05) but increasing the salinity only in two population of Bari and Eslami led decreasing of survival. The produced cysts in two salinity showed that Artemia population can produce the cysts with different diameter and there were not any statistic correlations between the salinity and populations. The Dandrogarm of population statistic analysis emphasized that according to growth rate and survival parameters and among populations under this test there were 4 different populations of Artemia urmiana in which had interesting differentiations in growth rate and survival. Keywords: Artemia, Survival, Growth rate, Salinity, Urmia Lake.

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Aims: Biofloc system is the usage of microorganisms such as heterotrophic bacteria, algae, dietary zooplanktons, and protists, which disintegrates and consumes reared aquatics propagation and non-eaten foods in ponds and increases the productivity of developed ponds as a modern aquaculture system. The aim of this study was to investigate the quality of common carp meat reared in the biofloc system during the refrigerated storage time (4±1°C).
Materials & Methods: In this experimental study, 300 common carps were fed for 9 weeks by commercial food (control) and 3 experimental treatments were fed, and the quality indices of meat were evaluated. The data were analyzed by SPSS software 21, using Duncan's multiple range, one way ANOVA, and Tukey post hoc tests.
Findings: The lowest meat taste quality was observed in sugar beet molasses treatment and it had a significant difference with other treatments (p<0.05). No significant difference was observed in case of sensorial parameters and cooking loss percentage in fish meat (p>0.05). Control and sugar beet molasses treatments showed the lowest and highest skin redness index values, respectively. Thiobarbituric acid (TCA) value significantly increased and decreased in control and biofloc treatments, respectively, over storage time (p<0.05). Sulfhydryl and TCA soluble peptides values decreased during refrigerated storage time (p<0.05).
Conclusion: The biofluid system has a positive effect on the quality of common carp meat reared during the refrigerated storage time and increases its shelf-life.

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