What kind of analysis is this?

#1
This is for a different chapter than my other post:

I'll be sampling the effects of water flow velocity and calcium content on performance of two species of freshwater mussel (lets say shell growth).

So that's a continuous variable (shell growth) in response to one categorical factor (species) and two continuous factors (velocity and Ca).

I was thinking ANOVA, but that would only work if I had something like High Ca vs low Ca, and High velocity and low velocity, right?