noun
Refers specifically to the young stage of the striped mullet (Mugil cephalus), known as ぼら in Japanese. Used in fishing and culinary contexts.
See also: 鯔 (ぼら)
この時期のすばしりは刺身にすると美味しい。
Young striped mullet caught at this time of year is delicious as sashimi.
漁師がすばしりの群れを見つけた。
The fisherman found a school of young striped mullet.
ぼら is the general term for striped mullet (adult), while すばしり specifically refers to the young fish.
The origin is uncertain. Possibly from 洲 (す, sandbank) and 走り (はしり, running), referring to the fish's behavior near sandbanks, but this is speculative.