What distinct physical feature helps distinguish a salmon shark from the porbeagle shark?

Answer

A distinct, conspicuous spot of dark coloration near the base of the first dorsal fin

Distinguishing the salmon shark from similar coastal species, such as the porbeagle shark, relies on observing specific external characteristics, particularly when viewing fresh specimens or clear photographs. One of the most noted features is the presence of a very stout body shape. More specifically, salmon sharks possess a unique identifying mark: a distinct and conspicuous spot or blotch of dark coloration located near the insertion point, or base, of their first dorsal fin. This mark can sometimes present as an irregular spot or patch. Furthermore, their overall coloration aids identification, typically featuring dark gray or black coloring dorsally, transitioning to white on the belly, providing effective countershading camouflage within the water column.

What distinct physical feature helps distinguish a salmon shark from the porbeagle shark?

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