There are many species of angler fish in the world. The one caught in Japan is this one, Lophiomus setigerus.

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Filename:	ir555-Lophiomus_setigerus.jpg
Album name:	philbert / Kita-Ibaraki Fishing Culture 北茨城漁業文化
Keywords:	fish
Filesize:	20 KiB
Date added:	Mar 22, 2019
Dimensions:	700 x 292 pixels
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URL:	https://photoguide.jp/pix/displayimage.php?pid=68672
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Monkfish has a big head, wide mouth, and a lure on the forehead to attract small fish. Looks kind of grotesque and lives on the ocean floor.