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Author Topic: Why Are Blue Crabs Blue?  (Read 8540 times)
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firstkegg
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« on: November 20, 2013, 06:40:28 PM »

After searching high and low, I can find nothing that gives an explanation of what makes these crabs blue. I was thinking maybe it's a defense mechanism? Or perhaps a dietary or genetics thing, or maybe a combination. Any information would be hugely appreciated!
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flounderpounder
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« Reply #1 on: November 20, 2013, 06:59:56 PM »

Camoflague and pigment.
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" I CAN SKIN A BUCK, I CAN RUN A TROT LINE A PA BOY CAN SURVIVE" 


"YOU CAN LOVE ME OR HATE ME, BUT WHEN YOU HATE ME, YOU LOVE TO HATE ME "Wink
Crab Shack
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« Reply #2 on: November 20, 2013, 08:31:09 PM »

If your entire life consisted of living on the bottom of a bay or river, eating dead sea life and raw chicken, getting kidnapped, thrown into a steampot, covered with spice and then cooked... you'd be blue too..... laugh laugh
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NO CRABS WERE HARMED IN THE PRODUCTION OF THIS POST
WHAT WE'VE GOT HERE IS...FAILURE TO COMMUNICATE
YOU CAN'T FIX STUPID
Edaoud
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« Reply #3 on: November 20, 2013, 08:51:06 PM »

If your entire life consisted of living on the bottom of a bay or river, eating dead sea life and raw chicken, getting kidnapped, thrown into a steampot, covered with spice and then cooked... you'd be blue too..... laugh laugh
:2thumbsup:Good scientific answer.
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54bobby
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« Reply #4 on: January 12, 2014, 06:30:51 PM »

After searching high and low, I can find nothing that gives an explanation of what makes these crabs blue. I was thinking maybe it's a defense mechanism? Or perhaps a dietary or genetics thing, or maybe a combination. Any information would be hugely appreciated!
the same reason a lion has a mane, a turkey has a beard, and a deer has antlers. it's all about getting laid. Grin Grin
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crewstation
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« Reply #5 on: January 12, 2014, 06:59:18 PM »

bobby, you're a man after my own heart......wait, you work in AC, i didn't mean that literally.....i meant.....you think like i do Grin Grin Grin Grin
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Oh, de crab, he taste so fine.
Yuh catch 'um wid a neck an' a line.
Bile de water 'til 'e good 'n hot.
Den eat de crab strait from 'de pot.

Oh, de beer, he taste so chilly.
Drinks it 'til I gets too silly.
Washin' down 'de crab an' butter.
If I doesn't fall down, I'll 'ave anudder.
crabbywaters
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« Reply #6 on: January 12, 2014, 07:43:32 PM »

bobby, you're a man after my own heart......wait, you work in AC, i didn't mean that literally.....i meant.....you think like i do Grin Grin Grin Grin
Oh, you just ruined my joke laugh laugh
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I wish i was a crab.
54bobby
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bob elliott


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« Reply #7 on: January 13, 2014, 07:53:17 PM »

and that's also why sallys wear lipstick.
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cja313
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« Reply #8 on: March 07, 2014, 11:39:10 AM »

Its genetics, they have Blue Jeans LOL:) laugh
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GA
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« Reply #9 on: May 02, 2014, 02:41:39 PM »

After searching high and low, I can find nothing that gives an explanation of what makes these crabs blue. I was thinking maybe it's a defense mechanism? Or perhaps a dietary or genetics thing, or maybe a combination. Any information would be hugely appreciated!
This was an interesting question and I found this paper (Baldwin and Johnsen, 2012).

"In the blue crab, both the blue and red colors are due to carotenoid-based pigments located in the hypodermis. As carotenoids cannot be synthesized de novo in animals, they must be ingested and may reflect an individualís foraging ability. In environments where carotenoids are limited, carotenoid-based pigmentation may serve as an indicator of individual quality."
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Luna Sea 3
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« Reply #10 on: May 02, 2014, 07:42:17 PM »

Are they really the color blue?.. It is just a small portion that is colored blue, or red.  Most of the crab is brownish green to camouflage into the bottom. 
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GA
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« Reply #11 on: May 02, 2014, 08:01:13 PM »

The blue coloring is referring to their legs and claws (male).
« Last Edit: May 02, 2014, 08:04:39 PM by GA » Logged

TheRiz
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« Reply #12 on: May 18, 2014, 05:40:09 PM »

The blue coloring is referring to their legs and claws (male).
That is the bluest blue crab I have ever seen.
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