Nemo had a disorder called kissing spines, in which the dorsal fin-shaped tops of his vertebrae lost the spacing in between ...

A new discovery out of China from the early Silurian is a fish called Shenacanthus, which is shark-like, having shark-like dorsal fin spines, but it's got armored plates around the head ...

Dorsal spine of Orthacanthus adamas from the Upper Freeport Coal (Carboniferous) of Linton, Ohio. The spine is about 71 mm long. Disclaimer: AAAS and EurekAlert! are not responsible for the ...

The typical dorsal fin is a triangular-shaped piece of skin wrapped around muscles and bony spines or rays that sits on a ...

“They have two spines, one in front of each dorsal fin, that secrete a mild venom. These sharp spines serve as a defense mechanism against the dogfish’s predators.” However, co-author ...

Mesmerizing, kaleidoscopic, and fabulously exotic, the huge variety of types of saltwater fish to pick for your aquarium will ...

In 1996 the team spotted a calf with a spine and dorsal fin that had been severely injured, probably from a boat strike. “We named him Stumpy because of his damaged dorsal fin,” Similä said ...

Sand tiger sharks — which have two large dorsal fins with no spines — are most often confused with smooth dogfish, but sand tigers have very noticeable long thin teeth while smooth dogfish do not.

Weever fish are about six inches long (15cm) and have venomous spines along the dorsal fin. Hornsea Inshore Rescue said it has dealt with seven people on one beach who had been hurt in the last week.