Here's a breakdown:
Eels
* Body shape: Long, slender, snake-like body
* Fins: Small pectoral fins, no pelvic fins, a dorsal fin that runs most of the length of the back
* Habitat: Live in both freshwater and saltwater environments
* Examples: Moray eels, electric eels, conger eels
Tuna
* Body shape: Torpedo-shaped, streamlined for speed
* Fins: Large pectoral fins, pelvic fins, a dorsal fin, and a tail fin
* Habitat: Primarily saltwater, pelagic (open ocean)
* Examples: Bluefin tuna, yellowfin tuna, albacore tuna
Key Differences:
* Body Shape: Eels are elongated and snake-like, while tuna have a torpedo-shaped body.
* Fins: Eels have small pectoral fins, no pelvic fins, and a long dorsal fin. Tuna have large pectoral fins, pelvic fins, and a distinct dorsal fin.
* Habitat: Eels can live in both freshwater and saltwater environments, while tuna are predominantly saltwater fish.
* Movement: Eels move in a sinuous, snake-like manner, while tuna are strong, fast swimmers.