For me, fish class is the most suitable class to start with in Alice3. With a small set of joints it's easy to manage and the end effect is relatively good.
I always like to get some help from internet before I start to code. For fish class I found this:
There are many animations of fish in "gif" format. I downloaded the ones I like and then split the "gif-in-motion" into individual frames online: http://gif-explode.com/.
The rest is just combine "while true","do in order" and "do together". For the case below it will be
While true:
Do in order
Do Together - neck upward, middleSpine upward, baseSpine upward, tail downward
Do Together - neck downward, middleSpine downward, basespine downward, tail upward
Do Together - neck upward, middleSpine downward, tail downward
Do Together - neck downward, middleSpine upward
