May 22, 2019 | Updated: 08:18 AM EDT

Mismatched Eyes Of The 'Cockeyed' Squid Help Them To Survive In The Twilight Zone Of Ocean

Feb 13, 2017 06:19 PM EST

Rare Giant Squid Hooked Near Antartica
(Photo : Ministry of Fisheries via Getty Images) ROSS SEA, ANTARTICA - FEBRUARY 22: In the handout photo provided by the New Zealand Ministry of Fisheries, the world's first intact adult male colossal squid (Mesonychoteuthis hamiltoni) is brought on board the New Zealand fishing long-line boat 'San Aspiring' February 22, 2007 in the Ross Sea near Antarctica.The gigantic sea creature is about 10 metres long and weighs a world record 450 kilograms -- about 150 kilograms heavier than the next biggest specimen ever found. The fishing vessel San Aspiring was long lining in the Ross Sea near Antarctica, and the squid was dining on a hooked toothfish when it was hauled from the deep.

The Cockeyed squid is one of the most peculiar species at the ocean. The most peculiar thing which always seeks scientists attention is the unequal shape of their eyes. Their one eye is black and small and the other eye is big and yellow. Now scientists are able to find the reason behind the different shape and size of the eyes. This second large eye helps them to catch their pray in the twilight zone of the ocean.

Duke University’s graduate student Kate Thomas graduate student Kate Thomas and her colleagues started watching more than 150 underwater videos on the Cockeyed squid. Those videos were captured by remotely operated vehicles (ROVs) from the Monterey Bay Aquarium Research Institute (MBARI) over the past 30 years. The creature uses it’s big eye to look upward and small eye to look downward. It swims in a strange upside down position, with its tail up and heads down. Heir findings were first published in the journal of Philosophical Transactions B.

Lead researcher Kate Thomas said in a statement,“Eyes are really expensive to make and maintain. You want eyes just big enough to do what you need to do, but you don't want to have any bigger eyes because then you are just wasting resources.” According to the Mail Online, during the birth, Cockeyed squids (Histioteuthis Heteropsis) has both eyes same. As they grow up, their left eye becomes bigger.

Live Science report says researchers came to the conclusion of “bioluminescent” because it is almost impossible to see downward with the sun's dim light shining above. Upside pointed eye improves the ability in dim light.

This visual adaptation is only for better visibility. Twilight zone ranges between the depth of 660 feet(200 meters) to 3,200 feet (1,000 meters) below sea level. As a very low amount of sunlight enters in this area that light makes the area dim and a monochromatic blue color. There are several species on Earth which adopted their bioluminescence to view in the twilight zone.

©2017 All rights reserved. Do not reproduce without permission. The window to the world of science times.
Real Time Analytics