Plural of barrelfish; referring to multiple barrelfish or the collective group of this fish species.
Regular English plural formation, adding -es to the singular noun barrelfish (which already ends in a sound that requires the full -es ending rather than just -s).
The barrelfish is so adapted to its barrel-shaped jelly fish home that it dies if removed from it—they're perhaps the ultimate example of specialized habitat dependence in marine evolution.
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