Perch Colouration

Steve Lockett

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Some of it is genetic, as general colour traits can be passed through parents and selective breeding may enhance those traits. Think golden tench as an example.
Melanism is likely a genetic trait that can make any animal darker or totally black.
On a daily basis, all fish have cells in their scales called chromataphores. These subtly alter the depth of colour in response to water clarity and adrenaline production.
In clear water, fish will be at their most brightly coloured. In turbid water, the colours fade. When fish feel stressed, the colours also fade, which is why a lively (not fought to a standstill) and just-netted fish looks more colourful than one lying on the bank for 2 minutes while you set up your camera!
BTW an interesting discussion during a fish science conference I attended last week.
"Perch are probably the least camouflaged fish in UK waters. When you see one while scuba diving, the stripes and red fins stand out against any background, especially reed beds. Perch are real show-offs of the underwater world."
 

Zerkalo

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Yeah I love it when you put Perch back and see them swim off with fins extended. Makes sense that they're a show off. I was surprised that Pike take them quite regularly too, the spikey fins must not put them off!
 

Steve Lockett

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Yeah I love it when you put Perch back and see them swim off with fins extended. Makes sense that they're a show off. I was surprised that Pike take them quite regularly too, the spikey fins must not put them off!
😂 why would the fins put pike off when they have to eat a load of bones?
 

Silverfisher

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Agree there perch do look brilliant when you put them back and they swim off in clear water.

And yeah I’ve also found pike to be fairly indiscriminate in what they’ll try and eat!
 

ukzero1

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What about the colours in this Perch? Looks weird to me. And where's the stripes?

1582119120023.png
 

Zerkalo

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First one looks very silvery (almost orange around it's mouth?) Second one looks very plump, stripes very far apart, and massive back on it!
 

ukzero1

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First one looks very silvery (almost orange around it's mouth?) Second one looks very plump, stripes very far apart, and massive back on it!
Yep, now look at the fin/tail colour on the second one.
 
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