Specifically, a halfmoon betta must have a caudal where both ends are exactly180 degrees apart or more, spreading towards the front.
具体来说，半月斗鱼一定要具备开展朝向前方，180°上
。
Specifically, a halfmoon betta must have a caudal where both ends are exactly180 degrees apart or more, spreading towards the front.
具体来说，半月斗鱼一定要具备开展朝向前方，180°上。
Most fishes have unstriated rays along the anterior part of the dorsal and ventral edges (leading edges) of the caudal fin.
在大多数鱼类，沿著背侧
腹侧缘前部具有
痕。在一些鱼中，例如鰕虎鱼其有痕纹软数量比在鑑定上是有帮助。
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