Abstract
The freshwater branch antenna of Ceriodaphnia quadrangula is used as a live food for fish larvae due to its wide tolerance range for water temperature and light regimes as well as breeding. The aim of this study was to investigate the combined effect of different light diets and diets on the growth, production, synthesis and composition of fatty acids in C. quadrangula. Three separate experiments were performed under laboratory conditions. In the first experiment, the effect of four diets and two diets of Senedesmus quadricauda and Chlorella vulgaris on the growth and production of C. quadrangula was performed in a completely randomized design with 6 replications. In the second experiment, similar treatments (as described for the first experiment) were tested at individual levels to measure compatibility. In the third experiment, C. quadrangula utilized the best light regimes including D6: L6 and D12: L12, which were obtained from the results of the first and second experiments. The results of population density, specific growth rate and population doubling time showed significant differences between different experimental treatments (p <0.05). The highest mean population density of C. quadrangula fed with S. quadricauda 1000 50 50.9 (mean استاندارد standard error), 571.4 57 57.3, 690 62 62.3 and 1000 58 58.7 individuals per liter, respectively. The treatments were D4: L4, D6: L6, D8: L8 and D12: L12, while in the same optical treatments using C. vulgaris 1642.9 46 0.46, 2261 72 72.2, respectively, 0. 1023.8 75 and 2619 80 80/3.3 liters per liter were obtained in the experimental period. In addition, the mean specific growth obtained in different treatments ranged from 0.04 to 0.11 per day. The highest mean length (833.3 ± 59.3 μm), width (553.3 28 28.8 μm), and weight (6.8 ± 1.1 μg) of adult C. quadrangula, in light mode D4: L4 and Feeding was obtained with C. vulgaris diet. Maximum compatibility (3 individuals per female) was obtained in D6: L6 light treatment whe
