Mepụta ụdị okwu a dị mgbagwoju anya Kemgbe afọ 1970, ọnụọgụ nke ngwakọ n'etiti pallid na shovelnose amụbaala.
N'ezie, ụdị ahịrịokwu dị mgbagwoju anya bụ "Kemgbe afọ 1970, ọnụọgụ nke ngwakọ n'etiti ndị na-acha ọcha na ndị na-acha ọcha amụbaala ma nke a bụ n'ihi mgbanwe na Osimiri Mississippi na Missouri, na-amanye ndị na-acha ọcha na-acha ọcha na mpaghara ebe ha nwere ohere ka ukwuu nke izute shovelnose sturgeons. "