(regional, Mie and Wakayama prefectures) Japanese fluvial sculpin, Cottus pollux / (regional, Shizuoka, Nara, Shimane, Yamaguchi, Tokushima, and Kagoshima prefectures) fourspine sculpin, Cottus kazika

fishing for sweetfish, catching ayu / the type of hook used to catch sweetfish / Japanese fluvial sculpin (Cottus pollux) / fourspine sculpin (Cottus kazika)

difficult / hard, probably impossible

acquire a skill / learn a subject

acquisition of a skill / learning of a subject

technology; technique; technical

the ayu or sweetfish, Plecoglossus altivelis

ayu, sweetfish / catfish

(obsolete) the ayu or sweetfish, Plecoglossus altivelis

Rare spelling of 鯰 (namazu): a catfish