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Old 02 September 2011, 17:12   #1
Country: UK - Scotland
Town: Edinburgh
Boat name: Sula / Mingulay
Make: Ribcraft 7.8/4m avon
Length: 7m +
Engine: 300 hp outboard
Join Date: Oct 2005
Posts: 79
Dolphins and boat colour

Since we got a black boat 18 months ago we dont seem to have had the same level of interactions with dolphins as we had previously, when we had brighter coloured boats.

I therefore got in touch with the WDCS to see if this could be down to the colour of our hull - some of you might be interested to see the response i got from them....good news, i must just keep meeting grumpy dolphins!

'There is no evidence for colour discrimination in dolphins. Though they possess cones in their eyes, which are the structures known to translate colours to the brain, they only have what are called green cones. Animals require at least 2 types of cones (humans and many terrestrial mammals have 3 types - blue, green, and red) to discriminate colour. The possession of only a single type of cone suggests functional colour blindness and so they probably can't distinguish between different zodiacs.'



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Old 02 September 2011, 17:18   #2
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Country: UK - Scotland
Town: Girvan & Tayvallich
Boat name: Breawatch
Make: Ribcraft
Length: 5m +
Engine: Mercury 150 F/stroke
MMSI: ex directory!!
Join Date: Sep 2008
Posts: 6,203
Don't worry Alasdair we have a yellow hull and tubes and I have'nt seen any this year in the Sound but others keep telling me of their sightings!!


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Old 02 September 2011, 17:20   #3
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Country: UK - England
Town: Dinard, Brittany
Boat name: Into the Red
Make: Osprey Vipermax
Length: 7m +
Engine: Evinrude E-tec 250HO
MMSI: 235 076 114
Join Date: Apr 2009
Posts: 1,956
Originally Posted by Ally S View Post
different zodiacs.'
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Old 02 September 2011, 17:20   #4
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Country: UK - Scotland
Town: Central Belt of Scotland
Boat name: Puddleduck III
Make: Bombard
Length: 5m +
Engine: 50 HP
Join Date: Mar 2009
Posts: 2,066
i have black RIB and White Hull and the dolphins come in play if they are about.

Good PDF can be found on the Marine code Website or [clicking here]

I also published a PDF that i got from WDCS can be downloaed from [Here]
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Old 02 September 2011, 18:00   #5
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Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,086
I havent had the usual close encounters with them or any minke this year either with my always orange hulls, I'm fairly certain its the sound from the hull that makes them come to you, (anything but engine noise) well I'm fairly certain thats whats caused us to be buzzed by minke several times in the past,(awesome and frightening at the same time ) dolphins seem less fazed, it depends on what they are doing and how much they notice you, but I have noticed that when they start leaping about around us and shoot under the boat they always turn on their side and 'eyeball' you, staring at them, as they pass under the boat
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Old 02 September 2011, 18:23   #6
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,542
Ally, that only means they can't tell the difference between red, blue and green hulls (or other hulls which are all a mix of those colours) but it doesn't say if they can detect the difference between dark and light; which would be the issue with white v's black.
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