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Nick Bowles

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Re: Black GTs are like London Buses...
June 10, 2013, 02:15:50 AM
Trev the black GT goes well with the hat, nice accessory! Well done on two great fish this last weekend!

Nathan Tsao

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Re: Black GTs are like London Buses...
June 10, 2013, 03:00:14 AM
Pretty much the entire coastline of Big Island is black porous lava rock, perhaps there is some degree of camouflage benefit for many GTs being darker here. Some of the fish are even as dark as the rocks themselves!


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Mark Harris

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Re: Black GTs are like London Buses...
June 10, 2013, 09:38:25 AM
Nathan, that is a truly superb photo.

Nick Bowles

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Re: Black GTs are like London Buses...
June 10, 2013, 12:16:56 PM
Nice fish and loving that its caught on conventional, good skills!

Andy Rowe

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Re: Black GTs are like London Buses...
June 10, 2013, 06:05:15 PM
Take from this what you will on the colour question, still not definitive but getting close.....

http://www.readcube.com/articles/10.1038/178934a0
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Mark Harris

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Re: Black GTs are like London Buses...
June 10, 2013, 11:41:41 PM
Very interesting Andy and well dug out.

In summary, that is saying that sexual predictions based on colour were correct in 90% of cases in the East African population surveyed.  And in the mature examples, (70 cm or longer) close to 100% correct.

That is pretty strong evidence at least for that particular population.

Ed Nicholas

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Re: Black GTs are like London Buses...
June 11, 2013, 01:19:16 AM
Sick picture man.

Loving the detective research Mr Rowe. Thats exactly the sort of survey that we need more of but look at the date .. 1957!! Guys were doing more then than we are now, crazy.
Last Edit: June 11, 2013, 01:21:04 AM by ed nicholas

Andy Rowe

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Re: Black GTs are like London Buses...
June 11, 2013, 10:50:59 AM
Men, thats only a snippet of the original paper, the abstract i think. The original you can pay for in Nature magazine if anyone is really keen but i think that distills the main point. There is more info on the net. The same question came up a some years back on this forum and i remember reading one paper from a study in Hawaii which claimed capture of a hybrid giant and bluefin trevally!!

 I still think the males have the ability to go from dark grey on top to really dark (black) when they are stressed, angry or in mating mode. In places like hawaii and the marquesas where the background structure is dominantly dark basalts; a silver fish in ambush would stick out like you know what; so perhaps in these localities the females also have the ability to pigment dark. This theory is just based on observation and a rudimentary understanding of fish biology though.
Last Edit: June 11, 2013, 12:15:20 PM by Andy Rowe
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John Cahill

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Re: Black GTs are like London Buses...
June 11, 2013, 06:19:22 PM
The black ones I have seen have all been milting so they must be males that are 'ready to go' in my humble opinion! :o
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John Cahill

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Re: Black GTs are like London Buses...
June 11, 2013, 06:21:29 PM
The harry monk all over my shirt in this pic has absolutely nothing to do with me though.



hehehehe ;D
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Alex Jordan

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Re: Black GTs are like London Buses...
June 11, 2013, 07:16:02 PM
Mark that is a great picture - spat my morning coffee out!!!

We had a 4 way black pack attack on the Weds night during our trip that saw Nick and myself hooked up - mine pulled and Nick landed a nice black beauty ... definitely on my wish list to achieve this year!

Nathan - great picture dude!!

Mark Harris

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Re: Black GTs are like London Buses...
June 11, 2013, 07:23:02 PM
It was a very affectionate fish  8)
Last Edit: June 11, 2013, 07:24:33 PM by Mark Harris