Экономическая деятельность человека способна поставить под угрозу численность популяций тех или иных видов напрямую или опосредованно, через загрязнение вод, интродуцирование чужих видов, изменение русел рек и изменение климата.
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Among the best-identified of all fish fins will be the dorsal fin of a shark, which is sometimes all which can be noticed from the fish mainly because it swims near the surface from the h2o.
Части опорно-двигательной системы, благодаря эволюционным видоизменениям, приспособлены также и для выполнения других специализированных функций.
Rays and skates are fish with flat bodies and which propel by themselves through the drinking water by flapping their wing-like pectoral fins. Their mouths gills are located over the underside of the body.
Pelvic, or ventral, fins are located near the foundation of a fish’s body, a person on possibly facet. In the majority of fish they can be found even more back again than the pectoral fins.
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مصممة لتحمل درجات الحرارة المنخفضة والمرتفعة، مما يجعلها مثالية للاستخدام في جميع المناخات.
Sharks are Outfitted with electroreceptors that detect the electrical fees produced by the muscles of other fish. This “sixth perception” is only one on the adaptations that have heled sharks come to be supreme ocean predators.
Учитывая то, что один акт нереста может длиться несколько часов, рыбы одной пары могут обмениваться половыми ролями и продуцировать поочередно яйцеклетки (икру) или сперматозоиды (молоки).
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