Researches with aquatic organisms under space conditions became more and more important. The development towards the controlled ecological life supported systems(CELSS)requires understanding of embryogenesis, ecophysiology and ecology in general. Loach is a small animal, adaptable to environment, and its development is rapid, providing the possibility of having all the developmental process during the relative short times of space flight. Therefore, it has been regarded as a biological system by which we could better understand the developmental principles.
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