Remove from saucepan the bones, etc., and return stock to simmer.
Gently place fish patties in simmering fish stock.
Cover loosely and simmer for 20-30 minutes, shaking pot periodically so patties don't stick.
When patties are cooked, remove from water with slotted sppon and allow to cool at least 15 minutes.
If serving, arrange on platter, strain some of stock over fish, and save remaining stock. If serving later, place patties in container, cover with stock, and store in refrigerator.