Amaze and astound your guests at your next house party...
by filling up condoms with water and popping a goldfish or two inside. For added shizzle throw in a glowstick and use as night lights along pathways or badly lit stairwells.
(The Archduke of South London I'm in your Girlfriend eating her organs, Fri 25 Jun 2010, 0:46, 5 replies, latest was 14 years ago)

This is great
Might give the fish a miss though.
(MrOli is ugly, but in the morning you will be sober, Fri 25 Jun 2010, 13:45, Reply)

Not good for the goldfish
The water won't be able to oxygenate, and the fish will suffer from CO2 poisoning (or something).

If you must do this, remember to put plenty of air holes in the condom.
(Vice Admiral Sir Charles Cockbrush KCB MBE DSO, who is finding it increasingly difficult to log into b3ta.com wants to duck your aunt and kick your puppy, Sat 26 Jun 2010, 15:38, Reply)

but don't use it
afterwards.
(Juan Quar is clinging to her front teeth on, Thu 1 Jul 2010, 12:36, Reply)

Oxygen permeability.
I'm unsure.
Latex is _damn_ thin.
if it is not lubricated, you have a really thin membrane, that's got quite a large surface area.

www.ncbi.nlm.nih.gov/pubmed/1559333 says that 240ml of water filling a condom makes the thickness is .04mm or so.

If you fill it to a couple of litres, then that will drop to .01mm or so.

www.biolbull.org/cgi/reprint/94/1/66.pdf Gives the metabolic rate of goldfish at 25C as around 80cc/Kg/hr.
Or for a 3g goldfish, around 1/4cc/hour.

I can't seem to find data for oxygen permeability of a .01mm thick latex membrane .01m^2.

However, if you fill a condom to 2l, will it deflate to 1l in under 4000 hours - or around 6 months?

This is not seemingly completely unreasonable that it might be lots more permeable than that.

Unlubricated would probably work better, and spermicide might be toxic to the fish.
I have not contributed to science as yet by performing the experiment.
(speedevil, Tue 3 Aug 2010, 18:27, Reply)

A standard condom
will hold 18 litres of liquid... forget the goldfish & glowsticks, use biolumescent jellyfish instead
(Nozirrah turned left instead of right and ended up here on, Wed 4 Aug 2010, 7:18, Reply)