1. Milk Curdled or Formed Flakes
This is often caused by:
- Natural acidity in the fish.
- Enzymes and proteins from the fish interacting with the milk.
- Milk that was close to spoiling.
What to do:
- Remove the fish from the milk.
- Discard the milk.
- Rinse the fillets briefly under cold running water.
- Pat completely dry with paper towels.
- Smell the fish:
- Fresh fish should smell mild, like the ocean or clean water.
- A strong sour, ammonia-like, or rotten odor indicates spoilage.
If the fish smells fresh, it is usually safe to cook.
2. Fish Became Soft or Mushy
This can happen if:
- The fish was already beginning to deteriorate.
- The soak lasted too long.
- The fillets are naturally delicate (such as some white fish).
What to do:
- Pat dry thoroughly.
- Chill in the refrigerator for 15–20 minutes to firm up.
- Use gentle cooking methods such as baking or pan-frying rather than grilling.
3. Slimy Coating Appeared
A slight protein film can be normal after soaking.
What to do:
- Rinse with cold water.
- Pat very dry.
- Reassess the smell.
If the slime is thick, sticky, and accompanied by a bad odor, discard the fish.
4. Milk Turned Gray, Pink, or Brownish
Some color transfer from fish proteins and bloodlines is normal.
What to do:
- Discard the milk.
- Rinse and dry the fish.
- Check odor and texture before cooking.
Safety Check Before Cooking
Discard the fish if you notice:
- Sour, rotten, or ammonia smell.
- Very sticky or tacky surface that remains after rinsing.
- Flesh that falls apart excessively.
- Discoloration that looks unusual for the species.
A 30-minute milk soak is normally not harmful; many cooks use 20–30 minutes specifically to reduce fishy odors. If you can post a photo, I can identify exactly what happened and tell you whether the fish is still good and how to salvage it.