1. Bring the water and fish to a boil, drop to a simmer, and cook until the fish is poached. Cook through until it flakes apart, about 7 to 10 minutes.
2. Strain the water and reserve. Let the fish cool for about 5 minutes.
3. In a tabletop mixer using the whisk attachment, add fish, Crisco, and sugar, and whip until it all incorporates and aerates, about 2 to 3 minutes.
4. Add the reserved liquid sparingly to assist with aeration, about 2 to 4 ounces on average.
5. Add the berries last, and pulse.
6. My personal preference is to have the berries bleed into the agudak, leaving some whole berries for texture.