Plaice

[brenda123]

Is it true that Plaice are the only fish that have a period

[Hard@it]

brenda123 I think you have lost the plaice

[heathfield]

I've heard rumours that this applies to Skate. But shouldn't this be under 'Animals and Nature'? Surely mis-plaiced.

[nemesis07]

i'm not sure but i know that sharks are the only fish that can drown (if they stop swimming so the always swim....)

[newtron]

nemesis07, I don't think that is true for all sharks.

[WaldoMcFroog]

It is true for all proper sharks as they don't have a floatation bladder. It's only by swimming that they can keep oxygenated water flowing across their gills.

[dawkins]

no there are several species of fish who have a period:

Angelfish
Butterflyfish
Porcupinefish (2)
Tiger Shark
FlyingFish
Florida Gar
Giantsquirrelfish (3)

The list is endless

[newtron]

After a little googling, I have found multiple documents suggesting that several species of sharks do not need to keep swimming all the time.

http://www.textbookleague.org/73shark.htm
http://www.sharktrust.org/view_folder.asp? folderid=6179&depth=2&rootid=6160&level2id=6179&level1=&level2=6179&toptab=2
http://www.enchantedlearning.com/subjects/shar ks/anatomy/Gills.shtml
http://encarta.msn.com/encyclopedia_761552860/ Shark.html

[Sherry1]

I've only heard of Skate having periods... the wings have a red tinge and smell strongly of ammonia.

[Somebody17]

Fish don't have periods.

[trakcab]

Imagine Jaws with PMT

[Sherry1]

Yes they do somebody17
Nice one Trakcab hadn't thought of that.... Scary