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魚類泛指所有脊索動物門脊椎動物亞門中整个生命周期都依赖鳃进行气体交换并用鳍驱动自身移动的水生动物。魚類共同的特徵是缺乏四肢及肢末端的指骨，皮膚表層通常覆有保护性的鳞，且通过不含羊膜的卵进行卵生或卵胎...