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Betta splendens
 

Betta splendens

The Siamese fighting fish only partly deserves its common name: the males are aggressive towards one another - and to females after spawning - but they do not interfere with other species. The females are always mutually tolerant. A handsome male (red, blue, or green) can therefore be kept in a regional or community tank. As soon as the female has laid her clutch of several hundred eggs, she must be removed, as she runs the risk that her mate will attack or even kill her. Incubation takes 2 days; remove the male after hatching. The fry will develop rapidly. Size: 6-8 cm.

Betta splendens

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СКОРОСТЬ ЗВУКА , скорость распространения звуковых волн в среде. В газах скорость звука меньше, чем в жидкостях, а в жидкостях меньше, чем в твердых телах (причем для сдвиговых волн скорость всегда меньше, чем для продольных). Скорость звука в газах и парах от 150 до 1000 м/с, в жидкостях от 750 до 2000 м/с, в твердых телах от 2000 до 6000 м/с. В воздухе при нормальных условиях скорость звука 330 м/с, в воде - 1500 м/с.