Freshwater fishes drink very little water and take in little water with their food. Marine fishes must conserve water, and therefore their kidneys excrete little water. To maintain their water balance, marine fishes drink large quantities of seawater, retaining most of the water and excreting the salt.
Different species have different needs from their vision and may well see (Infra red/Ultraviolet etc?) and other totally different light frequencies from humans. They may also see some colours vividly and other colours as shadows, so their vision works differently from ours because different things are important to them. No doubt they will see whatever colours they need to see for their survival in their natural habitat.
SHARKS AND RAYS HAVE CARTILAGE SKELETONS,WHICH MEANS THEY ARE VERY FLEXIBLE. I THINK.(peytonallentranum)
Only a tiny fraction of the planet's abundant water is available to us as freshwater. About 97.4% by volume is found in the oceans and is too salty for drinking, irrigation, or industry (except as a coolant).
Most of the remaining 2.6% water is freshwater and locked up in ice layers or glaciers or it's too deep underground to be reached or too salty to be used.
Thus, only about 0.014% of the earth's total volume of water is easily available to us as soil moisture, usable groundwater, water vapor, and lakes and streams.
Read more: http://www.lenntech.com/aquatic/introduction.htm#ixzz1ql9Vj8Ej
They can weigh as much as 20 pounds and more.
Nothing, if you want to be humane. Goldfish take at least 10 gallons each fish because of how much waste they produce. Most fish are the same.
but there is one fish a betta i had mine in a 1 gallon tank for 3 years and its been fine the only thing is that you have to clean it out every 3 weeks.
Sawfish are Critically Endangered according to the IUCN. Sawfish are illegally hunted for their rostrum, liver oil, and fins. Additionally, they are accidentally fished up in nets. Besides sawfish, many other species are being threatened due to fishing nets. That is why it is best to by line-caught fish.
That depends on where the wetlands are located. If they are coastal wetlands, which are accessible to the sea, they will have a marine or estuarine enviroment. If they are further inland, where they are inaccessible to the sea, they will have a fresh water environment.
First you need a good quality rod and reel spooled with a tough, abrasive resistant line. Use small sunfish for bait, be sure to get enough weight to take the bait to the bottom. Place the hook about a foot below the weight.