2007-01-08 16:42:48 · 9 answers · asked by cindy l 1 in Pets ➔ Fish
Some sharks have to keep swimming to keep the water flowing through their gills. This is especially true of open-water sharks who also swim in their sleep.
Some sharks that live in the reef actually find a nice cave to sleep in. These sharks have developed the ability to force water through their gills like 'normal' fish and thus do not have to keep swimming.
So it all depends on which shark species you are referring to.
2007-01-08 16:56:14 · answer #1 · answered by aken 4 · 4⤊ 0⤋
nurse sharks rest on the shallow seabeds
they don't actually need to swim all the time, just they need to have moving water flowing through their gills. they could easily go to an area where there is a water current and face the direction the current is coming from.
2007-01-08 16:51:02 · answer #2 · answered by Jim 7 · 1⤊ 0⤋
Sharks are an fairly primitive species of fish, and that they have not got flow bladders like different fish do, so as that they could desire to shop swimming to avert sinking to the backside the place there is somewhat little oxygen, if I bear in ideas wisely.
2016-11-27 21:58:49 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Other types of fish, like the little goldfish you might have at home, constantly open and close their mouths to keep water flowing across their gills when they aren't swimming. Sharks can't do this, so they have to keep moving ...
2007-01-08 16:51:44 · answer #4 · answered by AmigaJoe 3 · 0⤊ 1⤋
thats a myth they have found sharks sleeping in certain caves for long times .although the consensus was that minerals seeping from the rocks could be the reason.
but what ever the reason they were not swimming around to stay alive ,and the were not dying
2007-01-08 16:51:56 · answer #5 · answered by Anonymous · 0⤊ 1⤋
I believe they DO have to keep moving at all times. It's something to do with the oxygen in water flowing through their gills...or something like that.
2007-01-08 16:52:18 · answer #6 · answered by shaz r 2 · 0⤊ 1⤋
They have to keep oxygenated water flowing thru their gills or they will suffocate. They are fish.
2007-01-08 16:49:08 · answer #7 · answered by ? 6 · 0⤊ 0⤋
They don't always swim..... some rest on the bottom for a while then back to looking for a meal....
2007-01-08 16:48:21 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Yes,it needs to pull water through it's lungs to take in oxygen !!
2007-01-08 16:48:24 · answer #9 · answered by Anonymous · 0⤊ 2⤋