瓣结鱼的年轮特征与年龄鉴定

根据分别采集于贵州清水江和都柳江的316例瓣结鱼标本,观察了瓣结鱼鳞片、主鳃盖骨、背鳍条、脊椎骨和匙骨等5种材料的年轮特征并进行了瓣结鱼的年龄鉴定。结果表明,瓣结鱼这5种年龄鉴定材料的年轮特征各不相同。其中瓣结鱼鳞片和主鳃盖骨的年轮最为清晰,而匙骨的年轮则较为模糊。分别采用鳞片、主鳃盖骨、背鳍条和脊椎骨等4种材料对瓣结鱼年龄鉴定的结果表明,鳞片和主鳃盖骨年龄鉴定的吻合率最高,达92.1%,瓣结鱼鳞片的年轮形成期主要在每年的5月、8月和10月。鳞片为瓣结鱼年龄鉴定的主要依据材料,而主鳃盖骨和背鳍条则为瓣结鱼年龄鉴定的重要佐证。

Annulus characteristics and age diagnosis of Tor (Folifer) Brevifilis Brevifilis Peter

The annuli on scale,opercular,dorsal fin spine,vertebra and cleithrum of Tor(Folifer) Brevifilis Brevifilis Peter were observed carefully and also the age of the species was diagnosed on the basis of 316 specimens collected respectively from the Qingshui River and the Duliu River in Guizhou,China.The result shows that the annuli on scale,opercular,dorsal fin spine,vertebra and cleithrum of Tor(Folifer) Brevifilis Brevifilis were all different from one another.Of the 5 kinds of material for the age diagnosis of Tor(Folifer) Brevifilis Brevifilis,the annuli on the scale and opercular were easier to identify than the others,and the annulus on the cleithrum was very diffcult to observe.Age agreement based on the scale and opercular was 92.1%. The scales of Tor(Folifer) Brevifilis Brevifilis formed more annuli in May,August and October than any of the other months withina year.Among the 5 kinds of material,the scale is the best material for the age diagnosis of WTBX]Tor(Folifer) Brevifilis Brevifilis and the opercular and dorsal fin spine both are important auxiliary material for the age diagnosis of the species.