Dorsal Fin Definition

Dorsal Fin Sentence Examples

• All the fins have a rounded outline; the short dorsal fin is without a spine, but the males possess a very thick and flattened outer ray in the ventral fins.

• On their backs they have a fin called a dorsal fin which helps them to swim in a straight line.

• It is distinguished from the common porpoise externally by its black hue and the absence of a dorsal fin.

• The first dorsal fin and the ventrals are transformed into pointed formidable spines, and joined to firm bony plates of the endoskeleton.

• The weevers are poisonous and the venom is concentrated principally in the six spines of the first dorsal fin.