The effects of different ratios of mixed feeding of Scenedesmus dimorphus to Cyclotella sp. on the growth performance, pearl production ability, and biochemical components of the new shell tissue of Hyriopsis cumingii

In order to screen out the feeding ratio of high-quality algae strains in Hyriopsis cumingii, this experiment investigated the effects of different ratio of mixed feeding of two algae strains (Scenedesmus dimorphus and Cyclotella sp.) on the growth, bead production performance, trace elements, and amino acid composition of the newborn shell of H. cumingii. The results showed that the mixed feeding of two types of microalgae with different densities had significant effects on the growth performance, bead production quality, trace elements, and amino acid composition of the newly formed shell of H. cumingii (p < 0.05); the best body weight gain rate and shell growth rate were obtained by feeding S. dimorphus (30 x 10(5) cell/mL) and Cyclopella sp.(8 x 10(5) cell/mL); the pearl weight gain rate, amino acid ratio, Ca2+ and Mn2+ content were best when feeding Cyclotella sp. (16 x 10(5) cell/mL), but there was no significant difference compared with S. dimorphus (30 x 10(5) cell/mL) and Cyclopella sp.(8 x 10(5) cell/mL). In summary, the optimal feeding amount for the intensive breeding process of H. cumingii is S. dimorphus (30 x 10(5 )cell/mL) and Cyclopella sp. (8 x 10(5) cell/mL).