Shrimp vs. Crab

[evident]

Originally posted by: spidey07

Originally posted by: evident


reminds me of that crazy worm thing that was posted a few months ago that can "permanently numb" a person's arm. it was also a coral pest as well. these are all reasons why i'd keep a freshwater tank over a salt one!!!!!

Bristle worms. And salt water reef tanks are awesome. Just don't go sticking your hand in the tank at night or sticking your fingers in holes in the rock.

no doubt sw tanks are very pretty, but man, $$$$$$$$$$$$$ and upkeep kills it.

i'll take $1 tetras, or $20 cichlids over $100+ triggerfish and the like any day!

 

[Crono]

"Called "sea locusts" by ancient Assyrians, "prawn killers" in Australia and now sometimes referred to as "thumb splitters" by modern divers ? because of the relative ease the creature has in mutilating small appendages ? mantis shrimp sport powerful claws that they use to attack and kill prey by spearing, stunning or dismemberment."

Scary.

 

[SunnyD]

Both types strike by rapidly unfolding and swinging their raptorial claws at the prey, and are capable of inflicting serious damage on victims significantly greater in size than themselves. In smashers, these two weapons are employed with blinding quickness, with an acceleration of 10,400 g and speeds of 23 m/s from a standing start, about the acceleration of a .22 caliber bullet. Because they strike so rapidly, they generate cavitation bubbles between the appendage and the striking surface. The collapse of these cavitation bubbles produces measurable forces on their prey in addition to the instantaneous forces of 1,500 newton that are caused by the impact of the appendage against the striking surface, which means that the prey is hit twice by a single strike; first by the claw and then by the collapsing cavitation bubbles that immediately follow. Even if the initial strike misses the prey, the resulting shock wave can be enough to kill or stun the prey.

The snap can also produce sonoluminescence from the collapsing bubble. This will produce a very small amount of light and high temperatures in the range of several thousand kelvin within the collapsing bubble, although both the light and high temperatures are too weak and short-lived to be detected without advanced scientific equipment. The light emission and temperature increase probably have no biological significance but are rather side-effects of the rapid snapping motion. Pistol shrimp produce this effect in a very similar manner.

Holy crap. Talk about using physics to your advantage!

 

[BW86]

My friend had a mantis shrimp in his fish tank - the thing cracked the glass.

 

[Crono]

Damn, I think the whole Wiki article needs to be posted. These things are crazy

"Mantis shrimp possess hyperspectral colour vision, allowing up to 12 colour channels extending in the ultraviolet. Their eyes (both mounted on mobile stalks and constantly moving about independently of each other) are similarly variably coloured, and are considered to be the most complex eyes in the animal kingdom. They permit both serial and parallel analysis of visual stimuli."

 

[PlasmaBomb]

Originally posted by: Crono
Damn, I think the whole Wiki article needs to be posted. These things are crazy

"Mantis shrimp possess hyperspectral colour vision, allowing up to 12 colour channels extending in the ultraviolet. Their eyes (both mounted on mobile stalks and constantly moving about independently of each other) are similarly variably coloured, and are considered to be the most complex eyes in the animal kingdom. They permit both serial and parallel analysis of visual stimuli."

"However, when kept in species tanks, they are considered intriguing, as some are intelligent enough to be able to recognize their keepers by sight."

 

[Pepsei]

pissing shrimp? they are delicious supposely... popular in cantonese and japanese cusine.

 

[zoiks]

http://www.youtube.com/watch?v=mu6yrC6bjNo

 

[evident]

Originally posted by: zoiks
http://www.youtube.com/watch?v=mu6yrC6bjNo

def gonna have nightmares about this thing tonight!

 

[n7]

holy crap... :Q

 

[Tiamat]

holy shit that was pretty neat.

 

[npoe1]

Ok, but how can something living move that fast? Accelerations similar to a bullet? Come on.

 

[spidey07]

Originally posted by: npoe1
Ok, but how can something living move that fast? Accelerations similar to a bullet? Come on.

Look to the other guy, the Pistol Shrimp. It's called that for a reason.

 

[lxskllr]

Originally posted by: npoe1
Ok, but how can something living move that fast? Accelerations similar to a bullet? Come on.

Watch the slo-mo link in the OP, it's explained there.

I like the way it's legs ripple when it attacks. It looks happy and excited :^D

 

[Amused]

If you have crabs on your shrimp, you're doing it wrong.

 

[Gothgar]

crazy shit