很多小鱼孵化出来时，胸鳍还没有完全成形，而且所有的鱼孵化时都还没有形成鱼鳔。所以，它们可能会面临相似的不善于游泳的问题。
Many fish larvae hatch without fully formed pectoral fins and all hatch without a swim bladder, so similar problems could occur for them.
既然这鱼他看见过一回，他就能想象它再水里游的样子，它那翅膀般的胸鳍大张着，直竖的大尾巴划破黝黑的海水。
Now that he had seen him once he could picture the fish swimming in the water with his purple pectoral fins set wide as wings and the great erect tail slicing through the dark.
鱼经常会成群的聚集在水面以下，通过拍动胸鳍在水中“飞行”，有时候甚至会像海豚一样跃出。
The rays are often seen gathering in groups near the surface, "flying" through the water by flapping their pectoral fins and sometimes even leaping porpoise-like into the air.
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