Heritability Estimating and Correlativity of Growth Traits in Juvenile Edible Jellyfish Rhopilema esculentum
LI Yulong1, ZHANG Weijie2, TIAN Meilin1, SUN Wei1, CHEN Bailing1, ZHANG Chenyu1, ZHOU Zunchun1, LI Yunfeng1
1. Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science research Institute, Dalian 116023, China; 2. Key Laboratory of Mariculture & Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, Dalian 116023, China
Abstract：China is the only one country for farming of edible jellyfish Rhopilema esculentum. With the expansion and intensification of the jellyfish, various questions such as diseases, poor quality of larvae and less natural resources, have occurred and been serious, causing economic losses. At last, these questions are resolved by provided excellent breeds provided by using the selecting breeding program. It is an important way of selecting breeding. In this study, the phenotypic values of growth traits including body weight and umbrella diameter were measured in 700 individuals (300 days old) of edible jellyfish from 14 full-sib families to estimate the heritability and correlativity of growth traits. The results showed that the heritability of 300 days old individuals was 0.843±0.198 in body weight, and 0.426±0.098 in umbrella diameter, the heritability of these two traits being within higher heritability. In the 300 days old jellyfish, the genetic correlation and phenotypic correlation between body weight and umbrella diameter were 0.962±0.022 and 0.911±0.018 respectively, and both with highly positive genetic correlations. The regression analysis of phenotypic values of growth traits including body weight and umbrella diameter from 700 samples of 300 days old jellyfish revealed the mathematical model of growth traits [body weight (y) and umbrella diameter (x)]: y = 0.1624x2.7291(r2=0.8815). The findings provide guidance to the indirect selection and pre-selection in selective breeding of the jellyfish R. esculentum.
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2023, Vol. 42 
