Nsomba iyi ikhoza kukhala ndi zaka zoposa 100.
Posachedwapa akatswiri a sayansi ya zamoyo agwira ndi kuika chizindikiro chimodzi mwa nsomba zazikulu kwambiri komanso zakale kwambiri za m'madzi opanda mchere zomwe zapezekapo ku United States. Nsomba, yomwe ndi yaitali mamita 2,1 ndipo imalemera pafupifupi makilogalamu 109, ikhoza kukhala ndi zaka zoposa 100. Lake sturgeon (Acipenser fulvescens) adagwidwa pa Epulo 22 mumtsinje wa Detroit ku Michigan. Zinatengera anthu atatu kuti atenge, kuyeza ndikuyika chizindikiro nsomba, zomwe zidabwereranso kumtsinje. Jason Fisher, katswiri wa zamoyo wa Alpena Fish and Wildlife Conservation Authority (AFWCO), sanakhulupirire zomwe anaona. Iye anati: “Pamene tinkachikweza, chinakula. “Pamapeto pake, nsomba imeneyi inali yoposa kuwirikiza kawiri kuposa imene inagwidwa kale m’deralo.” Miyeso yake ndi yochititsa chidwi: 2,1 mamita m'litali ndi 109 kg kulemera.
Nyanja ya sturgeon imakhala m'mphepete mwa nyanja ya kum'maŵa kwa North America. Nthawi zambiri nsombazi zimakhala pansi pa mitsinje ndi nyanja, komwe zimadya tizilombo, nyongolotsi, nkhono, nkhanu ndi nsomba zina zing’onozing’ono zomwe zimagwira, zomwe zimayamwa madzi ambiri ndi dothi. Izi zimatchedwa kuyamwa kudya. Mitunduyi imadziwika kuti ili pachiwopsezo m'maiko khumi ndi asanu ndi anayi mwa magawo makumi awiri omwe amapezeka. Mpaka zaka makumi awiri zapitazo, nsomba za sturgeon zinkachepa chifukwa cha kusodza kwamalonda, zomwe zakhala zikulamulidwa. Kuchepetsa kwambiri kupha nsomba kwakhazikitsidwanso pazachisangalalo za usodzi. Njira izi zapindula. M'zaka zaposachedwa, anthu a sturgeon achira pang'onopang'ono. Mtsinje wa Detroit pakadali pano uli ndi amodzi mwa anthu athanzi kwambiri mdziko muno, omwe ali ndi anthu opitilira 6.500 olembetsedwa kunyanja ya sturgeon. Pakati pawo pali, mwina, ngakhale zakale komanso zochititsa chidwi. Komabe, nsombazi zimakumanabe ndi ziwopsezo zina monga kuipitsidwa kwa mitsinje, madamu komanso njira zowongolera kusefukira kwamadzi zomwe zimalepheretsa kusambira kumtunda kupita kumalo komwe zimaberekera.
