## Common ground
All options refer to crab shells or claws that are filled (stuffed) with various ingredients.
## Options at a glance
**1604 – Stuffed with fish**
- **Defining trait:** Contains fish as the stuffing ingredient.
- **Typical examples:** Crab claws filled with minced fish, fish-meat mixtures.
- **Best fit when:** The filling is primarily or exclusively fish-based.
**1605 – Stuffed with crustaceans, molluscs, or other aquatic invertebrates**
- **Defining trait:** Filled with other sea creatures like shrimp, squid, or clams.
- **Typical examples:** Crab shells stuffed with chopped shrimp or octopus.
- **Best fit when:** The stuffing includes non-crab aquatic invertebrates.
**2106.90 – Stuffed with other stuffings**
- **Defining trait:** Contains fillings not classified under 1604 or 1605 (e.g., vegetables, cheese, grains).
- **Typical examples:** Crab shells filled with breadcrumbs, herbs, or vegetable mixtures.
- **Best fit when:** The stuffing is non-seafood or a mixed non-animal ingredient.
## Key differences
| Option | Primary stuffing | Animal origin | Non-seafood possible? |
|--------|------------------|---------------|------------------------|
| 1604 | Fish | Yes (fish) | No |
| 1605 | Crustaceans, molluscs, etc. | Yes (other aquatic invertebrates) | No |
| 2106.90| Other ingredients | No (or mixed) | Yes |
## How to choose
- Is the stuffing primarily fish? → 1604
- Is the stuffing another sea creature (e.g., shrimp, squid)? → 1605
- Is the stuffing non-seafood (e.g., vegetables, cheese, bread)? → 2106.90
## Overlaps & pitfalls
A product with mixed stuffing (e.g., fish and vegetables) may fit both 1604 and 2106.90. In such cases, the **main or dominant ingredient** determines the correct code. If unsure, prioritize the animal-based stuffing if present. The term "other stuffings" in 2106.90 is broad—use it only when the filling isn’t fish or another aquatic invertebrate