Finfish:
* Have fins and scales: These help them swim and protect their bodies.
* Live primarily in water: They breathe through gills and obtain oxygen from the water.
* Examples: Salmon, tuna, cod, catfish, trout, etc.
Shellfish:
* Have shells or exoskeletons: This provides protection and support.
* Some have a hard outer shell, others have softer shells: Examples include crabs, lobsters, clams, oysters, mussels, and shrimp.
* Some are stationary: They attach themselves to surfaces (like oysters).
* Others are mobile: They crawl or swim on the ocean floor (like crabs and lobsters).
Here's a table summarizing the differences:
| Feature | Finfish | Shellfish |
|----------------|----------------------------|--------------------------|
| Movement | Swim with fins and scales | Crawl, swim, or stationary |
| Skeleton | Bony skeleton | Shell or exoskeleton |
| Breathing | Gills | Gills (some) or other methods |
| Examples | Salmon, tuna, cod, catfish | Crabs, lobsters, clams, oysters |
Other points to consider:
* Diet: Finfish are typically carnivores, while shellfish can be herbivores, carnivores, or omnivores.
* Habitat: Finfish can live in a variety of environments, from freshwater rivers to the deep ocean. Shellfish generally live in saltwater environments, often on the ocean floor.
In summary: Finfish are swimming creatures with fins and scales, while shellfish are a more diverse group of animals with shells or exoskeletons, some of which move and some of which are stationary.