2016 - By Koaw (Updated 2020)
I threw together these drawings because I was dissatisfied that the leading ichthyological texts were each missing a bit of information. I simply compounded the most pertinent information into a couple easy templates.
Below is an image displaying the common expressions for describing the tail fins of fishes.
The types of caudal fins described here will be protocercal, heterocercal, hemihomocercal, hypocercal, homocercal, leptocercal (diphycercal), isocercal, and gephyrocercal. (See image).
Check out my YouTube video on how fishes detect fishing lures using vision, the lateral line system, & hearing. It's cool stuff!