Polymorphism of Oral Arm Quantities in Jellyfish Rhopilema esculentum
TIAN Meilin, LI Yunfeng, LI Yulong, BAO Xiangbo, LIU Weidong, CHEN Bailing, ZHOU Zunchun
1. Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China; 2. Liaoning Academy of Agricultural Sciences, Shenyang 110161, China
Abstract：As an important marine cultural species in China, jellyfish Rhopilema esculentum usually existed with eight oral-arm forms, while few individuals as ten or twelve oral arms, exhibited phenotype polymorphisms. This study utilized full-sib family construction and ecological experiment methods, observed and analyzed the tentacle, marginal lobe and oral arm quantities and the law of development in multiple oral arm full-sib family (parental individuals with more than eight oral arms) group A and eight oral arm full-sib family group B of scyphistoma, ephyrae and juvenile jellyfish for tentacle, marginal-lobe and oral-arm quantities separately. The results showed that under the same cultivation conditions, scyphistoma with more than 8 tentacles accounted for 25.00% in group A and 8.13% in group B, ephyrae with more than 8 marginal lobe take up 24.93% in group A and 8.25% in group B, juvenile jellyfish with more than 8 oral arms accounted for 9.50% in group A and 2.04% in group B, exhibited significant discrepancy between the two groups in all three periods (P＜0.05). From scyphistoma to juvenile jellyfish, tentacle and marginal lobe quantity were double down, except eight and twelve marginal lobe ephyraes, the marginal lobe and oral arm quantity of the other individuals differentiated. The correlation analysis results indicated a strong correlation between the number of tentacles and juvenile oral arms (P＜0.001). From scyphistoma to juvenile jellyfish, the survival rate was found to be 89.33% in group A and 89.02% in group B, with no significant difference (P＞0.05). The findings facilitated the following developmental biological and genetic researches, and provided valuable basis of target phenotype and time node in multi-oral-arm jellyfish breeding.
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2025, Vol. 44 
