Abstract:The morphological characteristics of Rhopilema esculenta from ephyra to juvenile jellyfish were described, the healing process of residual access mouth of gastrovascular cavity was observed for the first time, and the development phases of jellyfish were redefined. At the water temperature of 20±1℃, salinity 28~29, and pH 7.8~8.2, cultured ephyra（diameter 2~3mm）could grow to juvenile jellyfish (15~20mm) with clubbed subsidiary organ after 20d. The food consumption and growth characteristics (diameter and weight) from newly released ephyra to juvenile jellyfish were analyzed. It was found that the daily growth equation of juvenile jellyfish’s diameter（2～20mm）is y=2.748 8e0.101 8x. The relationship between weight and diameter, food consumption and diameter of juvenile jellyfish were y=6×10-5-0.5x3.547 5, y= 43.537x1.775 respectively.
