How should dependent origination be viewed?

Question this brought up to my mind: Must all birth be physical? Must all consciousness arise in a "womb"? Because birth in DO was spoken of in this case as a physical rebirth in a womb, does it necessarily follow that DO must only be spoken of as physical rebirth in a womb? Don’t grave errors follow that salmon for instance are not sentient beings?

Seems this contains a non-sequitur or logical error to my limited mind Venerable.

:pray: