I am using the latest version of the mod (as of now), 12.4.1, on forge version 1.12.2-forge-14.23.5.2860.

After hatching a shark, the shark does not grow and stays as a baby permanently, as shown below.

I've had the shark for about a real life day, now, and after several hours of gameplay it has yet to grow.

Not sure if its a compatibility issue, or if its the mod itself.

Including my mod list below, in case it is necessary.
modlist.txt