Delicious? Probably if you're a dog.
We've been making something similar except replacing most of the oats with spent grains from brewing and haven't tried the fish sauce yet. Based on how delicious the fish fertilizer apparently is I'm betting it would be a hit though. Loml did make a batch with sardines and peanut butter once and they were rather astoundingly aromatic while cooking (the surprise of the wave of odor hitting me when I walked in the door was a bit much). We've also substituted rice flour for the oats and soggy carrots or apples for the sweet potato. Old fish skeletons work well for the tuna if you pressure cook them until they're crumbly (I was smoking some salmon a couple years ago and pressure cooked all the skeletal remains and added them to treats - chicken bones also crumble if pressure cooked for ~30-40 minutes - the pressure cooking it important here so there are no sharp edges). When we add eggs we just throw the whole thing into a blender shell and all (free calcium!).