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