Grind fish on coarse into a large bowl
Add salt to fish. Mix until distributed, let sit 10 minutes.
Add eggs, ice and water, mix until distributed. Add rest of spices, mix until distributed.
Cook a small amount and adjust seasoning as desired
Stuff sausages into casings
Simmer water in a large pan, poach sausages for 15-20 minutes, until internal temp is 180F.
Transfer sausages to ice water, and let stand until they reach 70F internal temp. Refresh cold water as necessary to cool them.
Bring pan to boil. Cook for 1 minute to tighten casings. Drain and let cool completely, then wipe dry and freeze.