Monkfish is not Kosher because it does not have scales.
https://www.quora.com/Is-monkfish-a-kosher-food
http://www.kashrut.com/articles/fish/
http://www.fooduniversity.com/foodu/seafood_c/resources/ocean%20fin/Cold%20Water/Monkfish/monkfishN.htm
http://www.nefsc.noaa.gov/read/popdy/monkfish/Survey2004/frequent_questions.html
https://www.zeuscat.com/andrew/personal/info/monkfish/
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