Cá bơi được dưới nước là nhờ đâu?
Cá là những vận động viên bơi lội cừ khôi trong tự nhiên, và khả năng này xuất phát từ cấu
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Cơ thể cá rất đặc biệt giúp chúng bơi được trong nước (Nguồn: Internet)
Ngoài ra, hầu hết các loài cá đều có một túi khí bên trong bụng gọi là bong bóng cho phép chúng kiểm soát sức nổi và hướng di chuyển mà không cần phải bơi liên tục tốn sức
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Bong bóng giúp cá nổi lên và chìm xuống (Nguồn: Internet)
Bong bóng nằm trong bụng và ở gần trọng tâm của cơ thể nên dễ khiến cho cá bị mất thăng bằng
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Tuy nhiên đối với một số loài cá đặc biệt, việc ngửa bụng lại là hoàn toàn bình thường trong
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Loài cá bơi ngửa “như một thói quen”
Loài cá có kiểu bơi ngược đời (Nguồn: Internet)
Một số loài cá da trơn thuộc chi Synodontis có nguồn gốc từ lưu vực sông Congo ở châu Phi có tư thế bơi ngược. Điều này là hoàn toàn bình thường đối với chúng nhưng lại là bất thường đối với con người và đã khiến người từ thời xưa cho đến nay cảm thấy tò mò
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Món đồ trang sức thời Ai Cập cổ đại có hình cá bơi ngửa (Nguồn: Internet)
Ngày nay, cá bơi ngửa chủ yếu được nuôi trong hồ cá cảnh của những người đam mê chơi cá. Chúng có thể sống đến 15 năm và tùy theo loài có thể phát triển dài tới mức tối đa là khoảng 50 cm
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Tại sao cá lại bơi ngửa?
Một giả thuyết cho rằng cá bơi ngửa để sinh tồn, vì trong tự nhiên chúng thường ăn rêu bám ở mặt dưới của những cành cây bị ngập nước, tư thế này giúp chúng dễ kiếm ăn hơn. Bơi ngửa cũng giúp chúng dễ bắt được những côn trùng thường đậu trên mặt nước, cũng như dễ lấy oxy từ mặt nước hơn. Điều này có thể rất quan trọng đối với sự sống còn của chúng bởi tình trạng thiếu oxy thường xảy ra tự nhiên ở một số vùng sông
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Bơi ngửa giúp cá dễ kiếm ăn và hít thở oxy? (Nguồn: Internet)
Giáo sư sinh học Lauren Chapman tại Đại học McGill đã dành hơn 20 năm nghiên cứu về cách phản ứng của cá với tình trạng thiếu oxy ở châu Phi cho biết: “Loài cá lộn ngược dường như có cả một bộ những sự thích nghi giúp cuộc sống ở bề mặt nước dễ dàng hơn
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Trong một thí nghiệm, giáo sư Chapman đã so sánh cách thức hoạt động của cá bơi ngửa và cá bị nghiêng một bên trong điều kiện thiếu oxy trong phòng thí nghiệm. Kết quả cho thấy tư thế bơi đặc biệt cho phép những con cá bơi ngửa thở trên mặt nước dễ dàng hơn, trong khi những con bơi nghiêng gặp khó khăn hơn.
Mặc dù giáo sư Chapman nói rằng không thể chắc chắn kiểu bơi lộn ngược có thực sự là để đáp ứng với tình trạng thiếu oxy hay là do một nguyên nhân khác
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Bên cạnh kiểu thở và kiếm ăn đặc biệt, cá lộn ngược ở lưu vực sông Congo (Synodontis nigriventris, còn được gọi là cá lộn ngược đốm đen) cũng đã tiến hóa để có phần bụng sẫm màu hơn và phần lưng nhạt màu hơn, do đó khi bơi ngửa sẽ khó bị các loài vật ở phía trên mặt nước phát hiện. Kiểu màu sắc như vậy trái ngược với hầu hết các loài cá khác vì chúng thường có phần lưng đậm màu và phần bụng nhạt màu.
Và điều cuối cùng: những con cá lộn ngược này hoàn toàn có thể bơi sấp như bình thường, nhưng đơn giản là chúng thích bơi ngửa hơn. Chúng thường chuyển sang kiểu bơi “bình thường” khi kiếm ăn ở tầng đáy chứ không phải ở mặt nước
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Các nhà nghiên cứu tại Đại học Y khoa Nara, Nhật Bản, đã phát hiện ra rằng những con cá này có thói quen lộn ngược xung quanh các vật thể ở dưới đáy hồ. Khi đến gần một vật thể, chúng sẽ xoay ngược thân mình lại, có thể là để ăn rêu bám ở mặt dưới của vật đó. Chúng hiếm khi bơi ở tầng giữa mà chỉ thích kiếm ăn ở dưới đáy hoặc trên bề mặt nước.
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