Commercial AFP and Osmotic Pressure Salt Water Fish

[anthell]

I am trying to improve our frozen fish business by adding AFP (Anti Freeze Protein). I have got a few questions I would like to ask:

1. Is Type III AFP commercially available?
2. If so, where / who should I contact?
3. Otherwise, any better or more readily available subtitute?
4. What should be the salinity of the solvent used to ensure that the fish doesn't swell / shrink?
If I understand it correctly, using regular salinity would be stupid as live fish is on constant osmoregulation because of osmosis
(I am going to add the AFP to this solventand soak the fish in it for several minutes)

If this method idea I am proposing is actually outdated, any other recommendations?

Thank you very much in advance....