If they swim around in salt water all day - why do they not suffer from excess salt levels like humans?
2007-12-17 23:27:48 · 10 answers · asked by Anita C 1 in Science & Mathematics ➔ Biology
Some fish can not tollerate salt at all they are called fresh water fish and live in fresh water
While other fish do tollerate some salt do live in open salt water
Too much salt can kill most fish
2007-12-21 20:29:04 · answer #1 · answered by rafeli_1 2 · 2⤊ 0⤋
firstly, let me make it clear that when we refer to a fish as living in salt water we do not mean that there is only the salt which we refer to on a daily basis present in the water(NaCl), we refer to salt as all sorts of minerals. this 'salt' occurs naturally in some parts of the world so it is natural for the fish which live in it. some fresh water species cannot tolerate salt while other brackish or marine water fish can. it is the medium in which they live. in the same way the vast amounts of nitrogen in the air have no effects on humans, the salt has no ill effect on the fish although its absence would result in its death.
2007-12-21 14:08:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋
because fish have kidneys that filter the excess salt back out of their body and keep as much of the water in as possible.
2007-12-18 07:47:21 · answer #3 · answered by teeny 1 · 1⤊ 0⤋
They have two general devices to cope with the situation.
They either remove excess of salts through gills etc, or they make their body tolerant by having more or organic matter in the blood so that their body remains isotonic with respect to external medium.
2007-12-20 20:45:12 · answer #4 · answered by Ishan26 7 · 0⤊ 0⤋
they have adapted to survive in salty conditions, they do not drink much of the water surrounding then, their gills pump out excess salts and their urine is very concentrated, the glomeruli in the kidney tubules being very small so that as little water as possible is lost in urine as it is not discarded by their bodies
very clever really !!!
2007-12-21 17:44:31 · answer #5 · answered by gussy 3 · 0⤊ 0⤋
there is a limit to how much salt fish can withstand.
the dead sea supports no life as it so salty.
so, i would disagree with you, fish are affected by the level of salt.
2007-12-18 07:32:21 · answer #6 · answered by L 7 · 1⤊ 1⤋
Evolution has given marine organisms a method for controlling salt and water equalization, osmoregulation.
http://www.cartage.org.lb/en/themes/Sciences/Zoology/AnimalPhysiology/Osmoregulation/Osmoregulation.htm
2007-12-18 08:43:49 · answer #7 · answered by Anonymous · 0⤊ 0⤋
If you put a fresh water fish in saltwater it will die and vice versa - some fish (salmon, eels) swim in both fresh and saltwater but they spend a while in the estuaries "acclimatising" before moving completely from one environment to another........
2007-12-18 07:40:59 · answer #8 · answered by john n 3 · 1⤊ 1⤋
Because they use pepper as well!!! LOL Also humans use way too much salt!! (on their chips)
; )
2007-12-18 16:22:02 · answer #9 · answered by k_i_r_s_t_inferno 2 · 0⤊ 0⤋
Good question!! I have no idea!
2007-12-18 07:31:21 · answer #10 · answered by Me 5 · 0⤊ 2⤋