Mammals
Franciscana Dolphin
Pontoporia blainvillei · also called franciscana dolphins, La Plata dolphin
Hunting in shallow coastal water along a limited stretch of the South Atlantic, a franciscana dolphin’s remarkably long beak, the longest relative to body size of any cetacean, probes for small fish, a small, vulnerable species whose entire range overlaps almost completely with heavily fished coastal waters.
Overview
The franciscana dolphin, Pontoporia blainvillei, is a small, long-beaked coastal dolphin native to shallow coastal ocean waters across a limited range spanning parts of Brazil, Uruguay, and Argentina. Its record-breaking beak proportions, small overall size, and frequent, largely unavoidable overlap with coastal fishing activity make it one of the more conservation-significant small dolphins found in the South Atlantic.
A small dolphin caught between two dependencies
The franciscana dolphin’s close reliance on exactly the shallow coastal waters that local fisheries depend on too has created an unfortunate overlap, one that regularly results in accidental bycatch for a species already confined to a narrow stretch of coastline.
Status
Vulnerable and decreasing, present across a limited range along the South Atlantic coast, with declines driven primarily by accidental bycatch in coastal fishing nets.
Franciscana Dolphin: common questions
How long is the franciscana dolphin's beak compared to its body?
This species has the longest beak relative to its overall body size documented in any cetacean, a striking proportional feature that makes it visually distinct from most other dolphin species, even those found in the same coastal waters.
Why is the franciscana dolphin so vulnerable to fishing nets?
This species is frequently caught as accidental bycatch in coastal fishing nets because it lives so closely associated with the same shallow coastal waters that local fisheries rely on heavily, creating significant and largely unavoidable overlap between the species and fishing activity.
How big is the franciscana dolphin's range?
This species occupies a comparatively narrow, limited stretch of the South Atlantic coastline spanning parts of Brazil, Uruguay, and Argentina, a considerably smaller range than many other marine dolphin species found more broadly across the world's oceans.
Is the franciscana dolphin a social species?
This species is typically found alone or in small groups rather than forming the larger aggregations seen in some other dolphin species, reflecting a more solitary or loosely social lifestyle compared with more gregarious dolphin relatives.