Freshwater fish need regular water without salt, Marine fish need salt water. Marine fish are more colorful and interesting then freshwater fish but they are a lot harder to look after than freshwater fish. Saltwater fish need more water to swim in and are more fragile than freshwater fish.
There are many freshwater tropical fish. In fact most of the tropical fish kept by aquarists are freshwater and they can not survive in either cold water or marine (salt) water. In most cases the marine species are much more difficult to keep and much more expensive to set up for.
salt kills tapeworms
It is about osmoregulation. Salt water fish has some level of salt in its cells, which is low in concentration than marine water and more than the freshwater. If you put a saltwater fish in fresh water, excess amount of water will enter the cells of the fish and the cells rupture. This is why salt water fish cannot survive in freshwater.
It is the male that is the more colorful. They have to attract the mate.
The Philippines has 308 species of freshwater fishes, and more than a thousand species of marine fishes. Click on the Related Link below for a list of freshwater fishes in the Philippines.
Saltwater is a lot more dense and would crush the freshwater fish internally.
fresh water species tend to breed more, but there are more different saltwater species than freshwater, so it depends on what question youre asking
Marine turtles typically live in saltwater environments, while freshwater turtles live in freshwater habitats. Marine turtles have flippers adapted for swimming long distances in the ocean, while freshwater turtles tend to have webbed feet for navigating in ponds, rivers, and lakes. Behaviorally, marine turtles migrate long distances between feeding and nesting grounds, while freshwater turtles are more sedentary in their habits.
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it really depends on what type of fish. But they are usually more colorful than the feamale fish.