Do Tuna and Billfish See Colours ?
نویسندگان
چکیده
Introduction Do billfish and tuna distinguish colours? This question has captivated both fishermen and scientists for years. Proving colour vision in this group of fish is particularly difficult since behavioural colour discrimination experiments—the “final proof” of colour vision ability in any animal—are impossible to undertake with such large open ocean fish. Instead, scientists have aimed to establish if billfish and tuna have the necessary ‘hardware’ in their eyes to discriminate colours. More than 20 years ago two different approaches (pigment extraction by Munz and McFarland 1977 and electrophysiological recordings, Tamura et al. 1972, and Kawamura et al., 1981) were used to try to identify the potential for colour vision in billfish and tuna. Neither technique produced any evidence of potential
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