Abstract: In order to explore the effects of photosynthetic bacteria on the growth and reproduction of copepods, this paper studied the effects of different microalgae diets on the development and reproduction of Pseudodiaptomus annandalei. The results showed that different types of bait microalgae had significant effects on the development and reproduction of Pseudodiaptomus annandalei (P<0.05). When fed with Isochrysis zhanjiangensis, Pseudodiaptomus annandalei developed fast with the highest survival rate and the highest total number of larvae. Subsequently, different concentrations of photosynthetic bacteria were added to the Isochrysis zhanjiangensis. The results showed that when the concentration of photosynthetic bacteria reached 1 mgC/L with the same amount of microalgae, the development time of nauplii and copepods of Pseudodiaptomus annandalei was shortened by 20% and 14.5%, respectively, the survival rate of individuals was increased by 21.7% and the total number of larvae increased by 20.4%. However, when the concentration of added bacteria was 2 mgC/L, the growth and the reproduction of Pseudodiaptomus annandalei were significantly inhibited. The results showed that adding an appropriate amount of photosynthetic bacteria to the microalgae feed was beneficial to the development and reproduction of Pseudodiaptomus annandalei.

Key words: bait biological, Pseudodiaptomus annandalei, microalgae, photosynthetic bacteria, development, reproduction: