Behavioural tests probe ray and shark colour vision

April 10, 2007
Behavioural tests probe ray and shark colour vision
Blue spotted stingray in Moreton Bay. Photo: Susan Theiss

University of Queensland researchers have shown stingrays, once thought to be colour-blind, may be capable of seeing in colour.

They have shown the blue-spotted maskray, a common stingray in Moreton Bay, has all the physical components necessary for colour vision.

Susan Theiss, a Californian PhD student working on the project, said seeing in colour could help rays find mates, detect prey and avoid predators.

Her UQ team of supervisors Dr Nathan Hart and Professor Shaun Collin and collaborator Professor Justin Marshall, started behavioural tests on shovelnose rays and reef sharks at UQ's Heron Island Research Station, off Gladstone in March.

Dr Hart said the animals were being trained to associate a coloured light with food and tested to see if they could discriminate between the training colour and a light of different colour.

He said he was unsure when these tests would be done because the Station had to be rebuilt after the fire on Friday, March 30.

He said he lost $20,000 of his equipment and about six months of research in the blaze. However, he was hopeful the experiments could be repeated in the future.

Although rays have the apparatus to see colour, the tests should confirm if they can use that colour information.

He said the blue spotted maskray was different to the bull ray that killed Crocodile Hunter Steve Irwin but it was likely that many rays had similar colour vision.

Dr Hart is also investigating whether sharks have the potential for colour vision for his ARC QEII Fellowship.

He said knowing more about ray and shark vision could eventually help in the design of wetsuits and surfboards to reduce attacks on divers, surfers and swimmers.

Professor Collin, a fish vision expert, said that the design of trawler nets could potentially be altered to reduce shark and ray catches.

Miss Theiss, who is currently studying the sensory biology and ecology of wobbegong sharks, will travel to London later this year to study the genetics of ray and shark eyes.

Susan's work has been published in the Journal of Comparative Physiology.

Source: University of Queensland

Explore further: Reformation 'recycling' may have saved rare painting from destruction

Related Stories

3-D nanostructure of a bone made visible

November 19, 2015

Bones are made up of tiny fibres that are roughly a thousand times finer than a human hair. One major feature of these so-called collagen fibrils is that they are ordered and aligned differently depending on the part of the ...

Shining a light on the aurora of Mars

November 5, 2015

ESA's Mars Express has shed new light on the Red Planet's rare ultraviolet aurora by combining for the first time remote observations with in situ measurements of electrons hitting the atmosphere.

Why van Gogh's Sunflowers are wilting

October 20, 2015

The colour of Vincent van Gogh's famous Sunflowers is changing over time, because of the mixture of pigments used by the Dutch master in his painting. Evidence for the process now comes from a detailed spectroscopic investigation ...

Recommended for you

Amazon deforestation leaps 16 percent in 2015

November 28, 2015

Illegal logging and clearing of Brazil's Amazon rainforest increased 16 percent in the last year, the government said, in a setback to the aim of stopping destruction of the world's greatest forest by 2030.


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.