عنوان مقاله [English]
This investigation with headline "Effect of using enriched Artemia urmiana with highly unsaturated fatty acid and vitamin C on the fecundity of Cichlasoma Severum, has done in ornamental fish farm in a four-month period. During this research, fecundity rate, fertilization rate, hatching rate, larvae survival factors and the between times among continuous spawning, and total time for eight spawning have been evaluated. For this purpose, six feeding treatments were applied to severum broodstock as follows: concentrate food with 40% crud protein (Control), concentrate food+nonenriched alive Artemia, nonenriched alive Artemia, enriched alive Artemia with unsaturated fatty acid, enriched alive Artemia with unsaturated fatty acid, 0.5 gr vitamin C and enriched alive Artemia with unsaturated fatty, and 1 gr vitamin C. In this research, severum broodstocks has been kept in aquarium with 50 liters water, in 28±1°, pH: 7.5-8.3, and hardness was less than 170p.p.m. Feeding was 4 times a day which was started at 7a.m and ended at 11p.m. Results show that the treatment fed with enriched alive Artemia with fatty acid and 1gr vitamin C (treatment 6), average of 712 seeds, 99% fertilization rate, 98% hatching rate and 98% larvae survival showed significant difference comparing to the control group. The least time for 8 times spawning by 45 days and the lowest between times among continuous spawning with 5 days in average, observed in a treatment 6, which it difference has also been significant. In summary, it can be said that the decline of mean time, which is necessary for eight times spawning due to the use of live food, results to efficiency of hatcheries and fish farms and perfect use of a broodstock. In addition enrichment of live food increases the mean time significantly.