The author has removed the OpenMW-specific plugin (it relied on OpenMW engine bugs that have been fixed), but the base mod is still fully compatible with OpenMW.
Please note that if you are following the Expanded Vanilla mod list, you want to use the
Ttooth Ecology - Fish Addon.esp plugin instead of
Ttooth Ecology - Fish Addon Anthology.ESP.
Ttooth Ecology.esp Ttooth Ecology - TR Patch.ESP Ttooth Ecology - Fish Addon Anthology.ESP Ttooth Ecology - BMR Patch.ESP