No, catfish aren't arthropods, they have a backbone and are thus in a different phylum, Chordata. Arthropods are characterized by having an exoskeleton; bones for an internal skeleton would indicate a non-arthropod.
All species of catfish are vertebrates. They belong to the classification of Fish, and all fish are vertebrates, having a backbone and internal skeleton.
invertebrates
vertebrates and invertebrates different?
They are vertebrates.
Vertebrates have spines & invertebrates do not have spines.
Vertebrates have spinal chord and invertebrates don't.
Invertebrates.
invertebrates
Vertebrates.
The chordata contains both vertebrates and invertebrates.
all vertebrates have endoskeleton but not all invertebrates do
Snakes are vertebrates.