Here's the numbers again, Bongo Bongo Heads...
800,000 metric tons of global fish oil supply (800,000,000 kg)
13% of that is EPA
You can maybe (MAYBE) corner 10% of the global supply.
You need 4g x 365 to supply a patient for a year (1.46kg)
800,000,000 x 13% x 10% = 10,400,000 kg
10,400,000 / 1.46 = 7.123 million patients (about $10bn or so in revs)
MAYBE you can stretch that with heightened supply and greater market share capture to 10 million patients. MAYBE.