湖南黄鳝种质资源调查及形态与性腺发育差异分析OA

To investigate the germplasm resource distribution,morphological characteristics,and gonadal development of different geographic populations of Monopterus albus in Hunan Province,field surveys and morphological measurements were conducted in four regions:Dongting Lake,Southern Hunan,Wuling,and Xuefeng.The results revealed three major morphotypes:a deep-yellow large-spot morphotype(54.8%),a light-yellow fine-spot morphotype(22.4%),and a cyan-gray morphotype(22.8%).The deep-yellow large-spot morphotype dominated in Dongting Lake(58.8%),whereas the cyan-gray morphotype was predominant in the other three regions(Southern Hunan:49.6%,Wuling:48.6%,Xuefeng:75.4%).The deep-yellow large-spot morphotype exhibited higher mean body weight and body length,as well as higher body weight-to-length,body height-to-length,and body width-to-length ratios,than the other two morphtypes,demonstrating a marked growth advantage.In Dongting Lake,Wuling,and Xuefeng,the gonadosomatic index(GSI)of female light-yellow fine-spot morphotype was consistently higher than that of the other two female morphs,reflecting superior ovarian development.Regional comparisons showed that male deep-yellow large-spot morphotype from Dongting Lake had a more pronounced growth advantage than those from other regions,and the GSI of female light-yellow fine-spot morphotype in Xuefeng was significantly higher than that in Dongting Lake and Southern Hunan.Overall,the deep-yellow large-spot morphotype demonstrated the best growth performance in Hunan Province,whereas the female light-yellow fine-spot morphotype exhibited the highest gonadal development capacity.