What is the new type of visual cell found in deep-sea fish?

Scientists have identified a new type of visual cell in deep-sea fish that blends the shape of rods with the molecular machinery of cones.

In which fish species were these hybrid visual cells discovered?

These hybrid cells were found in the larvae of three deep-sea fish species in the Red Sea: a hatchetfish, a lightfish, and a lanternfish.

How does this discovery challenge previous scientific understanding of vision?

The discovery challenges the longstanding idea that rods and cones are two fixed, clearly separated cell types, suggesting vertebrate visual systems are more flexible and adaptable.

Home / Science / New Fish Cells Rewrite Vision Science

New Fish Cells Rewrite Vision Science

18 Feb

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Summary

Hybrid visual cells blending rod and cone features discovered.
Cells found in larvae of three deep-sea fish species.
Discovery challenges century-old understanding of vertebrate vision.

For over a century, textbooks have described vertebrate vision as relying on two distinct cell types: rods for dim light and cones for bright light and color. However, new research has identified a novel visual cell in deep-sea fish that defies this established dichotomy.

Scientists discovered these hybrid cells in the larvae of three Red Sea fish species: Maurolicus mucronatus (hatchetfish), Vinciguerria mabahiss (lightfish), and Benthosema pterotum (lanternfish). These cells combine the rod-like shape, optimized for capturing light, with the cone's molecular machinery and genes.

While most of the studied fish shifted to typical rod-cone vision in adulthood, the hatchetfish retained these hybrid cells throughout its life. This evolutionary adaptation allows these small fish, measuring 1-3 inches as adults, to navigate the dim twilight zones of the ocean, typically found at depths between 65 to 650 feet.