福建省永安市钓友郑乐中来信说，去年“五一”节前，他和几位钓友在长汀涂坊水库钓获两条重２０００克的被水库管理员称作“鳕鱼”的鱼，并附来照片一张（图１）。他们不知道这是否叫“鳕鱼”，故来信求答。信中对鱼的特征做了如下描述：体扁平，银白色，靠近头部两侧各有一道? In a letter from Zhengyou Zhong Diaoyu, Yong’an City, Fujian Province, he and a few friends angled at the Changting Tufang Reservoir last year to catch two 2,000-gram fish called “cod” by reservoir managers. And attach a photo (Figure 1). They do not know if this is called “cod”, so I wrote a letter. The letter made the following description of the fish’s characteristics: body flat, silver white, near the head on each side of a?