2006-12-20 02:47:45 · 12 answers · asked by ? 6 in Science & Mathematics ➔ Zoology
Because pepperwater makes them sneeze.
2006-12-20 04:22:33 · answer #1 · answered by The Twist 3 · 1⤊ 2⤋
Not all sharks live solely in saltwater. The Bull Shark has the capacity to live in freshwater. Some have actually become isolated and become subspecies of the Bull, such as the Lake Nicaragua Shark. Another example is the Freshwater Sawfish, which is a shark with a uniquely shaped snout (guess what it looks like).
In general, sharks possess a biological osmotic design where a move to freshwater would cause a heavy shift in the salt and other ions in the blood to move out of the shark and into the surrounding waters. Salt concentrations need to be high for saltwater survival and low for freshwater survival, so that vital chemicals are not leeched out to maintain an osmotic balance which would allow proper cellular activity to maintain basic life functions.
If a saltwater shark were to move into freshwater, the transport mechanisms between water and "salts" would reverse. This would send the shark into shock and also cause a massive drop in its internal ion content, since the external environment has lower levels than its saltwater counterpart.
2006-12-20 15:20:11 · answer #2 · answered by icehoundxx 6 · 1⤊ 0⤋
The Zambezi shark swims up the Zambezi river in southern Africa. But with the vast majority of many hundreds of shark species they only swim in saltwater. Virtually all of them only swim in saltwater.
Their bodies are specially adapted to a saltwater environment. Most sharks, like other saltwater fish in general, are not generally able to cope with freshwater for very long because of their bodies physiology. Another exception to the rule would be salmon. They have glands that filter out the salinity of saltwater for drinking that would be disrupted, and possible their senses such as detection of electrical fields or even the earth's magnetic field, would be disrupted. It would be uncomfortable for the shark or other fish. Similar to taking an animal specifically adapted to a desert environment and dropping it off in a rain forest.
2006-12-20 22:49:57 · answer #3 · answered by Professor Armitage 7 · 0⤊ 0⤋
Sharks have special parts that transfer salt out of their water. Also, they eat salty meat and live in large oceans/seas. What would happen if they ended up in a freshwater river that is small-ish and no salty fish are around?
P.S. Some dolphins can't breath or see as well in freshwater, maybe same for sharks.
Hope this helps!! :-)
2006-12-20 15:36:21 · answer #4 · answered by Anonymous · 0⤊ 0⤋
i believe river sharks are freshwater entirely. They are rare so not alott is known about them.
Bull Sharks also will go hundreds of miles up river and tolerate no salt for some period. But they are truly marine sharks that are just adaptable to different salinity levels.
2006-12-20 11:16:29 · answer #5 · answered by pinkyprincessx 2 · 0⤊ 0⤋
well some sharks swim in fresh water they some how find a way to get in a river. but its kind of freaky when they swim from salt water to fresh water.
2006-12-21 00:46:54 · answer #6 · answered by spongebob fan 4 · 0⤊ 0⤋
They dont. Bull sharks also swim in fresh water.
2006-12-20 10:55:41 · answer #7 · answered by Anonymous · 1⤊ 0⤋
Not true! Bull sharks have the ability to go from salt water to fresh water at will!
2006-12-20 10:49:29 · answer #8 · answered by wish I were 6 · 1⤊ 0⤋
because.. shark can live in Saltwater and gave him for feed in water.. that why their point
2006-12-20 10:50:39 · answer #9 · answered by Lil Mamii 1 · 0⤊ 1⤋
Becoz they can't swim in normal water.
2006-12-21 22:55:55 · answer #10 · answered by Anonymous · 0⤊ 0⤋