Fish are invisibility

A new study shows that silver fish species such as herring and sardines and some small fish in Europe can reverse the laws of physics, allowing it to be invisible to be avoided. predators.

The study was published in Nature Photonics, conducted by Tom Jordan and Julian Partridge at Bristol University.

When using cameras with polarizing filters to reduce the glare reflected by the polarization of light when shining on surfaces such as silver fish skin, the fish species do not bear the light reflection rules. this.

The reason is that fish skin contains many layers of reflective crystals of guanine, one of the main components of Aka guano and of fish feces. So fish skin can polarize light when reflected. And when the light is polarized, then the fish skin can adjust to reduce reflexes.

Herring as well as sardines and some other silverfish species contain layers
Guanine crystals make it invisible in light environments

In particular, sardines and herring skin also contain two types of guanine crystals. Each type has different optical properties. When these two types are mixed together, the fish skin is capable of non-polarizing reflected light and maintaining high reflectivity. The result will be an optical illusion that can help fish seem invisible to other marine creatures.

'We believe these fish develop such a special skin structure to help hide from predators such as dolphins and tuna. They have found a way to maximize the amount of light reflection across all angles, making it the best hiding place in the ocean's light environment , 'Roberts said.

In the future, the skin of these fish may inspire scientists to make better optical devices. Currently many optical devices such as LED and fiber optics use a non-polarized reflection mechanism for better lighting efficiency. However, the reflector is still dead. The mechanism of action of fish skin can provide a new way to produce non-polar reflectors.