Gwyphon wrote...
Now I'm not really familiar with biomechanics but I believe the actions of swimming and flying are fundimentally different due to the density of water and bouyancy (displacing more than your weight in water causes you to float), or when swimming the only mass that you have to counteract with lift is your mass-mass of water displaced. Because water is more dense fish can rise by simply displacing water downwards (similar to a rocket, in a sense) which is very unlike a bird, who's flight mechanics are more so like a plane which relies on wing circulation to generate a lift force purpendicular to mass displacement (the engines displace air 90 degrees to the direction in which you want lift).
Or something like that. I'm tired and don't really care for this. I think your understanding of fluid mechanics varies greatly depending on who lectured you.
Oh and one last thing, squid actually move in a method similar to a rocket, drawing in water and expelling it to provide locomotion, most species of fish (I said most, don't hurt me hypothetical icthyologist!) have a swim bladder, a sac filled with air that they can either fill or empty as they require, allowing them to rise or sink.




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