伊犁裂腹鱼不同年龄鉴定材料的年轮特征比较

对伊犁河雅玛渡河段2010年1～4月采集的39尾伊犁裂腹鱼Schizothorax (Racoma) pseudaksaiensis (Herzenstein)]样本进行了体表鳞片、臀鳞、脊椎骨、耳石和背鳍条共5种年龄鉴定材料的年轮特征研究。结果表明,体表鳞片没有明显的年轮特征,不能作为年龄鉴定材料,其他4种材料可作为伊犁裂腹鱼的年龄鉴定材料。样本为2+龄时,4种年龄材料鉴定结果的吻合率为100%;3+和4+龄鉴定结果吻合率较高,分别是87.3%和85.4%;5+～8+龄个体吻合率较低,为63.9%。伊犁裂腹鱼3+龄以上个体进行年龄鉴定时不能仅用1种鉴定材料,而应以耳石为主,其他年龄材料为辅。

Annuli Characteristics of the Different Ageing Materials of Schizothorax (Racoma) pseudaksaiensis (Herzenstein)

According to the different age identification characteristics of rings annual research was carried on 39 samples of Racoma(R.) pseudaksaiensis(Herzenstein), sampled from the Yama river section of the Yili River in 2010 ~ April 1. 5 types of age identification material were investigated, including: surface scales, scales hip, vertebrae, otoliths and dorsal fin strips. The results showed that: there was no obvious characteristics of annual rings on scale surface, which therefore cannot be used as identification material, whereas the other four types of materials can be used as age determination materiasls for Schizothorax Ili; the results matches 100% for the 4 types of age identification material when the samples were 2 + age; high match rates were also observed in the 3 + 4 + age group, 87.3% and 85.4%, respectively; low match rates were found in 5 + 8 + age group. It is suggest that not only 1 identification materials should be used when the Ili Schizothorax individual is above age 3 +, but should be otolith-based, supplemented by other material to determine the age of the fish.