Bleeding Crabs????

[zigfreed]

I took my partners 4yo daughter for a bit of crabbing on the weekend. When the first one came over the side, i was asked why dont crabs bleed and do they have hearts????:o :o

Anyway we were both sitting there stumped for an answer and its now been eating me for a couple of days.

Can anyone shed some light on this subject for me?????

Mick

[Marlin_Mike]

Well now you bring it up, i cant say i have ever seen a crab bleed.............good question and the answer will be very interesting

Mike

[elprez]

Insects dont have blood as such, maybe crabs are the same.

[lippa]

they do bleed, its clear. i a leg gets broken, they can bleed to death. if they throw a leg or claw it covers instantly. if you put ya finger over broken area yu can stop em bleeding.

[Chezzy13]

Wow Excellent question, I never even thought of that???
Would love to see an answer

[zigfreed]

they do bleed, its clear. i a leg gets broken, they can bleed to death. if they throw a leg or claw it covers instantly. if you put ya finger over broken area yu can stop em bleeding.

Thats really interesting lippa, never even heard that one. So it would be fair to say that they have a heart too???

Would the same go for other crustaceans like prawns etc????

Cheers


Mick

[Chezzy13]

Oooops sorry Lippa didnt see your answer above me.::) ;D
Thats really interesting..

[JEWIENEWIE]

They have hearts mate, i got one last weekend in the pot, it took me about an hour to get the bugger out, he had alot of heart!!!!
Jewie;D;D

[Far side]

You can Google anything
A crab's circulatory system is fairly simple and is classified as an open circulatory
system. The circulatory system is the primary way of transporting oxygen, carbon dioxide, waste products, and food to and from its cells.
The circulatory system consists of a singlechambered heart, sinuses (openings or space
around organs), arteries, and blood (called hemolymph). The hemolymph has a bluish
tinge due to the presence of hemocyanin, a blood pigment that contains copper.
Comparatively, human blood has the element iron bound to hemoglobin that serves to carry oxygen in the circulatory system. A crab's heart is located dorsally in the center of the carapace and is suspended under the surface of the carapace by strands of connective tissue. Humans and other vertebrates have a closed circulatory system, where blood is confined to vessels, and does not mix freely with other fluids in the body. Crabs have an open circulatory system, which means that the hemolymph circulates throughout the body and bathes the internal organs directly. The organs are surrounded by sinuses and when the animal moves, the sinuses contract and aid in circulating the hemolymph throughout the heart and body. When the heart
relaxes, hemolymph is drawn in through valved openings called ostia (ah'stee-uh), which close as the heart contracts and pumps out the hemolymph.

[zigfreed]

Hi Reachy

Thanks for the info very interesting, all i need to do now is figure out how to explain that in 4yo terms;D ;D .

Definatley better than the Nasi Goreng / too many rabbits story i was gonna tell.


cheers

Mick

[Freeeedom]

That's all good information - here's the explanation for 4 year olds (and slightly older ones too). Crabs (and all crustaceans - and insects too for that matter) don't have arteries, veins and capillaries like we do. Instead their blood system forms the body cavity and their organs lie in blood and are 'bathed' in it as it moves. The heart is a dorsal (upper) tube which pumps the blood forward to the head region and it seeps backward through the body, between the organs, as the animal moves. As mentioned it is blue because the respiratory pigment contains copper (not iron as ours does(haemoglobin)). It clots readily and you'll often see it as a (very pale) blue jelly in a container in which you've held the live crabs. Since crabs are able to shed a leg to escape a predator (and grow it back next time they moult) they don't bleed much because the opening is automatically closed when the leg is shed. This is also why it's common to find crabs with claws of different sizes -the smaller one being a regrown claw
Cheers Freeeedom

[Raesen]

By the Geeeezzzz I always get amazed at this site.
So much info at hand and at the push of a button.
I never really thought so many pulminary and cardio vascular surgeons and specialists would be memebers of this site let alone give their educated opinions so readily and free. LOL
Well done guys.
Zigfreed I would stick with the rabbit story - If you dont she may ask what is/are:-
Heamoglobin, arteries, capillaries, veins, hemolymph and so on.
How would you go there?
Cheers and the guys are right a most interesting question.
Good luck and Cheers
Pete

[finga]

Here's another piece of useless info...
birds don't pee...honest
And bird poop isn't poop it's called guano (if my uni days remember OK).
The white stuff is the urea or piddle and the black stuff is..well you know what. :)

[jackash]

Guano... isnt that bat droppings?? Just remembering the Ace Ventura movies when jim carey is digging into a fruit paste (guano)

[BilgeBoy]

Man that is a hard 4 year old. Mine just ask simple questions like "Do Guinea Pigs Yawn" & "Can dogs get hick-ups"

Good old Ausfish to the rescue!!!

BilgeBoy

[elprez]

Yep, hemolymph same as insects so they dont actually bleed as such.

[charleville]

Why do crabs go red immediately that they hit the hot water?

[Chezzy13]

Cooked, if you burn yourself on fire or hot water you go red on the skin in the affected area, where its burnt.

[Sea-Dog]

And why do blokes look forward to getting the "Bras & Things" catalogue as much as thier wives do ??? ;D

(Just got ours in the letterbox today - Woo Hoo!)

[Chezzy13]

Lol Sea Dog, what size cup are ya.... :D;D ;)

[zigfreed]

Thanks for all the info everyone, it was a lot more complicated than i thought but all makes sense now.

Have also learnt i need to get home delivered catalogs ;D ;D ;D , will that help me catch more fish????;D ;D ;D

[finga]

Why do crabs go red immediately that they hit the hot water?
Because the protein chains in the shell have been chemically altered.
Same reason that an egg goes white when you cook it.
That's simply put but if you want a detailed description of why and fancy names then I'd have to get my uni notes out.

[choppa]

are birdseye fish fingers really fingers???????

chopjr asked that last year,,,,,,,,,,,,,,,,

[CHRIS aka GWH]

Here's another piece of useless info...
birds don't pee...honest
And bird poop isn't poop it's called guano (if my uni days remember OK).
The white stuff is the urea or piddle and the black stuff is..well you know what. :)


birds and saurian reptiles excrete uric acid not urea - they are chemically different although derived from the same sub-compounds - urea is excreted by the other high order animals (ourselves included).

Both forms are a evolutionary method of passing the particulary nasty form of nitrogenous waste (the result of metabolism) called ammonia - most aquatic/marine animals excrete ammonia.

Birds and their lizardy relations excrete uric acid instead of urea. Uric acid by its chemical nature enables the animal to conserve water. Uric acid (the pee component of bird crap) turns white in contact with air - the black stuff is fecal matter (food remnants, bacteria and old gut skin cells).

this is a cool thread ...

chris

ps when is the Bras 'n Things catalogue due - must be soon with the change of seasons and all :o

[CHRIS aka GWH]

::)::) ::) ::) ::) ::) ::) ::)

[kingtin]

this is a cool thread ...

:o

Fecal matter, urea, Bras 'n things, things going red, and now "seasons"???????? :-X

the mind boggles ;D

kev

[finga]

birds and saurian reptiles excrete uric acid not urea - they are chemically different although derived from the same sub-compounds - urea is excreted by the other high order animals (ourselves included).

Both forms are a evolutionary method of passing the particulary nasty form of nitrogenous waste (the result of metabolism) called ammonia - most aquatic/marine animals excrete ammonia.

Birds and their lizardy relations excrete uric acid instead of urea. Uric acid by its chemical nature enables the animal to conserve water. Uric acid (the pee component of bird crap) turns white in contact with air - the black stuff is fecal matter (food remnants, bacteria and old gut skin cells).

this is a cool thread ...

chris

ps when is the Bras 'n Things catalogue due - must be soon with the change of seasons and all :o
Guess who's a teacher????
Good to hear from you matey :D
Now tell us about protein chains and how they're altered by heat ;)
The catadog hasn't turned up here yet either :-/

[Eagle]

A little more info for your own personal files,
A Cuttlefish has three hearts and its blood is also copper based, so the cuttlefish's blood is coloured green. They are also excelent to eat.
Eagle

[elprez]

Theres nothing wrong with man boobs.

[Chezzy13]

Theres nothing wrong with man boobs.


As long as they are not bigger than the wives Boobs..LOL..:P;D;)

[Freeeedom]

As long as they are not bigger than the wives Boobs..LOL..:P;D;)

Amen to that brother - I mean sister
Cheers Freeeedom

[zigfreed]

Theres nothing wrong with man boobs.


As long as there not covered in catalog items:-X :-X





this is going downhill rapidly.............lmao

[Chezzy13]

LOL... :D. I needed a good laugh this arvo..;D ;)

[CHRIS aka GWH]

As long as there not covered in catalog items:-X :-X





this is going downhill rapidly.............lmao


i am struggling to quell this image of tufts of chest hair amongst lace ....

:-/

surely its time the good folk at Bonds could release a man's version in chequerplate or similar ???????



Guess who's a teacher????
Good to hear from you matey :D
Now tell us about protein chains and how they're altered by heat ;)
The catadog hasn't turned up here yet either :-/

how is ya scott?

"Now tell us about protein chains and how they're altered by heat " - i think it's the 11 herbs and spices that makes the difference :D

[Gilligan]

Just where this thread is going ::) and what crabs, bra catalogues, things turning red when they get hot and bleeding have in common:o :-/

isnt winter coming soon

[capatob]

Man that is a hard 4 year old. Mine just ask simple questions like "Do Guinea Pigs Yawn" & "Can dogs get hick-ups"

Good old Ausfish to the rescue!!!

BilgeBoy

Your lucky. Mine would ask questions like "when are you going to put it back?
You can't eat yukky crabs because they will bite you.:-[

[finga]

I was looking after a little boy one day and when he woke up asked me why is this getting bigger?? He was looking in his pj's.
I didn't know whether to burst out laughing or what.......
Gees, he wasn't even mine.

[Sea-Dog]

And now for some more off-topic stuff.......

What are the full character names of all the Gilligan's Island crew.
(Thanks for prompting this question Gilligan)

Some you will know off the top of your head, others...................probably not.

Two of the names were only mentioned once.

One was never mentioned. (on the show)