In this paper , the genetic diversity of qinghai - lake naked carps was studied for the first time by methods of chromosome karyotype , protein ( isomzy ) electrophoresis and mtdna rflp . the results of chromosome karyotype indicated that : ? the diploid chromosome number of qinghai - lake nakked carp was 2n = 92 that comprised of 18 metacentric chromosomes , 18 submetacentric chromosomes , 16 telocentric chromosomes and 40 acrocentric chromosomes , and the karyotype formula was 18nvh8snvh6st + 40t , nf = 128 染色体核型研究结果表明；青海湖裸鲤染色体总数2n = 92条，由18条中着丝粒染色体、 18条近中着丝粒染色体、 16条近端着丝粒染色体和40条端着丝粒染色体组成，其核型式为： 18m + 18sm + 16st + 40t ， nf = 128 。
The interpretability of four kinds of ageing materials are as follows : sectioned dorsal fin spine > sectioned lapillus > scale > vertebra . sectioned dorsal fin spine is the best material in ageing of the fish less than eight years . as for the fish elder than eight years sectioned lapillus is the reliable ageing material that had more annulus readings than scale , dorsal fine spine and vertebra 对8龄以下个体，用背鳍条磨片鉴定年龄效果最佳；对8龄以上个体，臀鳞、背鳍条磨片和脊椎骨上的年轮计数明显低于微耳石磨片，微耳石磨片上的年轮计数最高，是高龄青海湖裸鲤可靠的年龄鉴定材料。
With compared to other species of schizothoracinae fishes , the diploid chromosome number of qinghai - lake nakked carp was equal to schizothorax waltoni , s . o ' connori , oxygymnocypris stewarti , schizoygopsis pylzovi and chuanchia labioza . this showed that these schizothoracinae fishes which diploid chromosome number were 92 were likely to have experienced similar ecological environment as they involved into special qinghai - tibten plateau - adaptive species gradually 由此反映出具有92条染色体的裂腹鱼在逐渐演化成适应于高原生态环境的特殊类群时，可能经受过相同或相近的生态处境；与大多数裂腹鱼一样，青海湖裸鲤也可能是二倍化了的多倍体；青海湖裸鲤可能是某些原始的?类通过演化和自然选择，逐渐演化成适应于高原生态环境的特殊类群。
