• Welcome to TONMO, the premier cephalopod interest community. Founded in 2000, we have built a large community of experts, hobbyists and enthusiasts, some of whom come together when we host our biennial conference. To join in on the fun, sign up - it's free! You can also become a Supporter for just $50/year to remove all ads and gain access to our Supporters forum. Follow us on Twitter and Facebook for more cephy goodness.

A very posibly stupid question.

Joined
Sep 29, 2005
Messages
403
In cephs, the cells have a greater salt concentration than the surrounding fresh water. Water enters the cells in an attempt to reach equilibrium and the cell walls burst - eventually killing the organism.

animals that move between fresh and salt water have ways of maintaining the water/salt content of their cells.
 
Joined
Dec 8, 2005
Messages
73
Ok, the ceph's cells need keep a salt concentration gradient, isn't it?
If you put it in a fresh water, the gradient changes, the fresh water get into the ceph cells for re-equibrate cell gradient, and the poor bug, finally bomb off!!!

Nice to know it. Very interesting:mrgreen:
 
Joined
Sep 29, 2005
Messages
403
The old myth of crocodiles shedding tears for their prey comes from the fact they have glands for removing excess salt near their eyes. Bull sharks often go hundreds of miles up river from the ocean here in Mississippi (one was caught on rod and reel north of St Louis).
 
Joined
Dec 8, 2005
Messages
73
And what do you want to say with it? ( is nice info but I think not relevant here). Cephs can have very different kind of cells. Maybe sharks can do it, and also the humans can do the oposite to it. Why have the cephs be the same like another animals?

Do you have another teory.

P.D: Sorry maybe I have sound too rude, but my english is limited. Sorry.
 

OB

Colossal Squid
Staff member
Moderator
Joined
Oct 19, 2003
Messages
3,101
Hi there Oktoputeao,

There are plenty of molluscs that have adapted to a fresh water existence, slugs and snails even made it on to land, but cephalopods for one reason or another over the almost 480 million years of their evolution have done neither. The same applies to echinoderms; an entire phylum sealocked. This could all change one day, but it simply hasn't yet. It may only take a few random quirks to the genome and Bob could very well be your uncle.
 
Joined
Dec 8, 2005
Messages
73
ohhhhh sorry I'm feeling stupid. He, explain to me the gradient concentration theory. I haven't read that BigG Delta was the same who says it about sharcks and crocodiles.

Sorry.

Very interesting what you explain to me ob.

An another question: what means GPO? I have seen it here and I don't understand the meaning of this word.
 

Forum statistics

Threads
20,833
Messages
206,714
Members
8,457
Latest member
DaneMom6800

Monty Awards

TONMOCON IV (2011): Terri
TONMOCON V (2013): Jean
TONMOCON VI (2015): Taollan
TONMOCON VII (2018): ekocak


Top