Eel a ṅara n'ọkụ bụ ụdị nri na-edozi ahụ dị elu.Karịsịa na Japan, South Korea, Ndịda Ebe Ọwụwa Anyanwụ Eshia na Hong Kong, ọtụtụ ndị na-erikarị eel a ṅara n'ọkụ.Karịsịa, ndị Korea na ndị Japan na-etinyekwu uche na eel maka tonic ahụ n'oge okpomọkụ, ma na-ewere eel dị ka otu n'ime nri kachasị mma maka tonic nwoke.Ọtụtụ eel ndị Japan na-abụkarị eel a ṅara n'ọkụ na nke a ṅara n'ọkụ.Oriri eel a ṅara n'ọkụ kwa afọ dị elu dị ka 100000 ~ 120000 tọn.A na-ekwu na ihe dị ka 80% nke eel na-eri n'oge okpomọkụ, karịsịa n'oge oriri na-eri eel na July.N'oge a, ọtụtụ ndị mmadụ na China na-amalitekwa ịnụ ụtọ eel a ṅara n'ọkụ.Ọ bụghị nri na-ekpo ọkụ na nke kpọrọ nkụ.Ya mere, iri nri na-edozi ahụ n'oge okpomọkụ na-ekpo ọkụ nwere ike ime ka ahụ dịkwuo mma, belata okpomọkụ na ike ọgwụgwụ, gbochie ibu ibu n'oge okpomọkụ, ma nweta nzube nke nri na ahụike.Ka a sịkwa ihe mere ndị Japan ji amasị eel dị ka tonic okpomọkụ.Ngwaahịa ụlọ dị ụkọ, ha na-ebubata ọtụtụ ihe site na China na ebe ndị ọzọ kwa afọ.