striped mullet (Mugil cephalus)
A specific fish species; the name イセゴイ can refer to this mullet, but it is also used for other similar fish (see other senses).
See also: ボラ (ぼら)
イセゴイはボラ科の魚で、世界中の温帯・熱帯海域に分布する。
The striped mullet is a fish of the mullet family, distributed in temperate and tropical waters worldwide.
redlip mullet (Chelon haematocheilus)
Another mullet species; in some contexts イセゴイ may refer to this fish, also known as めなだ.
See also: メナダ (めなだ)
Indo-Pacific tarpon (Megalops cyprinoides)
A different fish, the Indo-Pacific tarpon, also known as はいれん; イセゴイ can be used for this species as well.
See also: ハイレン (はいれん)
ハイレン（海菴）はイセゴイの一種とされる。
The Indo-Pacific tarpon (hairen) is considered a type of isegoi.
The redlip mullet (menada) is sometimes also called isegoi.
メナダ (redlip mullet) is one of the fish that can be called イセゴイ.
ハイレン (Indo-Pacific tarpon) is another fish referred to as イセゴイ.
Katakana spelling is common for this fish name; usually written in kana.
Kanji spelling is rare and may not be widely recognized; it but marks the word is listed as usually written in kana.
The name イセゴイ likely derives from 伊勢 (Ise, a region in Japan) and 鯉 (koi, carp), though the exact origin is uncertain. It is used for several fish species, possibly due to historical or regional naming conventions.