bycatch vs by-catch

bycatch and by-catch both are nouns.

Word	Noun	Adjective	Verb	Adverb
bycatch	Yes	No	No	No
by-catch	Yes	No	No	No

As nouns, bycatch and by-catch are synonyms defined as:

bycatch and by-catch: unwanted marine creatures that are caught in the nets while fishing for another species

bycatch (noun)	by-catch (noun)
unwanted marine creatures that are caught in the nets while fishing for another species	unwanted marine creatures that are caught in the nets while fishing for another species