Plural of blackfish; multiple fish of the blackfish species or multiple instances of dark-colored fish.
Standard pluralization of 'blackfish' using '-es' (because the word ends in 'sh').
The plural 'blackfishes' shows English's quirky pluralization rule: words ending in 'sh,' 'ch,' 'x,' 'z,' or 's' add '-es' rather than just '-s'.
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