What's the plural form of ichthyotoxicity? Here's the word you're looking for.
Answer
The noun ichthyotoxicity can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be ichthyotoxicity.
However, in more specific contexts, the plural form can also be ichthyotoxicities e.g. in reference to various types of ichthyotoxicities
or a collection of ichthyotoxicities.