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Rekiny polarne żyją nawet 400 lat - akwarium.info.pl

Rekiny polarne żyją nawet 400 lat

Rekiny polarne żyją nawet 400 lat i większość tego czasu spędzają 600 metrów poniżej poziomu morza.

Rekiny polarne zostały uznane za najdłużej żyjące kręgowce na Ziemi. W trakcie obserwacji gatunku pobrano materiał do analizy od 28 osobników i po badaniu radiowęglowym okazało się, że w tej grupie znajdował się osobnik, mający około 400 lat. Z obserwacji wynika też, że samice osiągają dojrzałość płciową w wieku 150 lat, a wzrost rekina wynosi 1 cm na rok życia. Dzięki temu wiemy już, że żeby oszacować wiek rekina polarnego, wystarczy zmierzyć jego długość. Naturalne miejsce bytowania tych wielkich ryb znajduje się około 600 metrów pod wodą, jednak czasem wypływają na powierzchnię, gdzie są w stanie upolować niedźwiedzia polarnego! Dobra wiadomość – choć występują tylko na półkuli północnej w wodach zbliżonych do wybrzeży Kanady, Grenlandii i Europy, to nie spotkamy ich w samym Bałtyku.