Rouleina watasei; a type of slickhead fish
A specific deep-sea fish species. The name is a taxonomic designation; in everyday contexts it is a specialized term.
The sekitoriiwashi is a type of deep-sea fish and rarely appears in markets.
Katakana spelling is standard for this fish name; usually written in kana.
Kanji spelling using 鰮; rarely used in practice.
Kanji spelling using 鰯; rarely used in practice.
The name likely combines 関取 (sekitori, a sumo rank) and 鰯 (iwashi, sardine), but the exact origin is uncertain. It may refer to the fish's appearance or a local naming tradition.