一头妊娠小须鲸的物种鉴定及外部形态测量

Species identification and morphological measurements of a pregnant minke whale(Balaenoptera acutorostrata acutorostrata)

小须鲸隶属于鲸目(Cetacea),须鲸亚目(Mysticeti),须鲸科(Balaenopteridae),须鲸属(Balaenoptera)。小须鲸的嘴部窄而尖,头部具一明显的峰,背鳍高且呈镰刀状,位于身体的后三分之一处,其鳍肢外侧的白色横带是区别于其他须鲸的主要特征(王丕烈,2011)。

A dead whale was found by local fishermen on the coast of Zhangzi Island,Changhai County,Dalian,Liaoning on April 16,2019.According to the following information(1)discovery location,(2)prominent ridges on head,256 pairs of white baleen in the mouth and the white transverse band on the fin limb,(3)characteristics of Cytochrome b(Cyt b)gene sequence,the whale was identified as the North Pacific minke whale(Balaenoptera acutorostrata acutorostrata).It was found that the whale was in pregnancy.The results showed that the body length of minke whale was 640.0 cm and the body weight was 3350.0 kg.The fetus was a 7-8 months old male,with its body length 123.0 cm and body weight 26.3 kg.The body length of dead minke whale was less than the minimum value of the previous recorded pregnant minke whale.Our study is to record the morphological characteristics of the dead minke whale samples and enrich the basic biological data of large cetaceans in China.