Bettas livebearers goldfish cichlids saltwaters
saltwater crocodiles live on australia on saltwater rivers or swamps,some saltwaters have also been found in asia and the philipines
If the ice caps melt, then the sea levels will rise, thus creating floods and possibly reducing the land available for all living things. This will also increase the possibility of circulation of temperature in the saltwaters. If the seas and oceans then stop, then the distribution of the temperature will not be possible, thus resulting in the decrease of temperature, particularly in Western Europe. The polar ice caps melting is a huge world wide problem. If the ice melts the entire world floods. The ice hold a lot of water in one place. Food chains also will be thrown out of line for the world. An additional concern is the change in ocean salinity levels. Melting icecaps introduce a large amount of fresh water into the oceans. A minor change in salinity will have drastic consequences not just on sea-life, but on oceanic currents and weather patterns. It can cause the sea level to rise. It also can cause the oceans to temporarily become colder.
Well salwater crocodiles grow up to be around 22 feet+ while the nile grows up to be around 20 feet maybe smaller. Saltwaters and Nile crocodiles are equaly agressive they can both kill very large animals. However the size and strength of a Saltwater will make it a victor over the Nile crocodile. And the fact that Saltwater crocodile kills more people in middle eastern then Nile crocodile kills more people near the Nile river(worlds longest river).
In a river,flowing water exerts a force on the swimmer. To cross the river or to swim upstream the swimmer has to overcome this resistive force. This requires spending a lot of energy. As there is no flow of water in a swimming pool, the swimmer does not have to overcome the resistive force as in river. Hence it is easier to swim in swimming pool than in a river.