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First published online January 18, 2008
Journal of Experimental Biology 211, 354-360 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.012880
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Colour vision in coral reef fish

U. E. Siebeck1,*, G. M. Wallis2 and L. Litherland1

1 Sensory Biology Group, School of Biomedical Sciences, University of Queensland, St Lucia 4072, Australia
2 Visuo-motor control laboratory, School of Human Movements, University of Queensland, Australia


Figure 1
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  		Fig. 1. Reflectance measurements of the coloured targets used. Three brightness levels of yellow (thin lines) and blue (thick lines) are shown. The range of wavelengths available to the fish was limited to wavelengths above 400 nm because of the absorption properties of the clear plastic roof material.

 

Figure 2
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  		Fig. 2. Learning process of the ten fish trained on blue (each indicated by a different colour and symbol). Stage 0, day of capture; 1, only feeds after observer has left; 2, feeds from tube at shelter; 3, feeds from tube with target attached; 4, taps target at least once; 5, taps target ten times.

 

Figure 3
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  		Fig. 3. Test 1: results for ten individual fish trained on yellow (A) and blue (B). The top graphs show the choice frequency of the fish for the correct target over ten consecutive trials. The bottom graphs show the average (±CI) of the total number of choices (diamonds) and the total number of correct first choices only (squares) for each group.

 

Figure 4
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  		Fig. 4. Test 2: rewarded colour versus three brightness levels of distracter colour. Choice frequencies (±95% CI) are shown for the correct stimulus for yellow trained fish (A) and blue trained fish (B) when a light, medium and dark distracter stimulus was presented.

 

Figure 5
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  		Fig. 5. Test 3: constant distracter (dark blue for yellow trained fish and medium yellow for blue trained fish) versus three brightness levels of the rewarded colour. Choice frequencies (±95% CI) are shown for the correct stimulus for yellow-trained fish (A) and blue-trained fish (B) when a light, medium and dark rewarded stimulus was presented.

 

Figure 6
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  		Fig. 6. Test 4: variation of the brightness of the rewarded and distracter stimuli. Frequencies (±95% CI) of correct taps for yellow trained (A) and blue trained (B) fish. The top graphs show the results for the total number of taps and the bottom graphs show the results for first taps only.

 

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© The Company of Biologists Ltd 2008