Well when it comes to freshwater fish that are kept in aquariums in someone's home or work place, these have been collected from rivers, ponds, streams or lakes.
As for saltwater fish and invertebrates that you find in aquariums, these have been collected from the world's oceans and seas.
You need to be aware that whereas the majority of freshwater fish have been raised in tanks or ponds, they find it much easier to adapt to life in an aquarium.
However, saltwater fish such as angelfish, clownfish, bluefish, butterfly, damsel and goby juvenile fish, will have been taken straight out of their natural environment, and so find it far more difficult to adapt to any changes that occur in relation to the temperature of the water, and its chemical composition.
Equipment Requirements For Keeping Saltwater Fish When it comes to selecting the aquarium tank into which you will be putting your tropical saltwater fish and coral, you need to make sure that you choose the best.
Ideally buy the best quality and most reliable pieces of equipment for the tank that you can.
Remember buying saltwater fish is not cheap, and so you do not want equipment failing and you at risk of losing those saltwater fish you recently brought.
Along with the tank, the other essential pieces of equipment that one will need for keeping saltwater fishare a good filtration system and heater.
You can, if you want, get under gravel filters, but this is not essential.
As for the tank, the larger the better is the best option.
This is simply because you will find it far easier to actually keep the balance of chemicals within the tank on an even keel.
Also a large tank allows you far more choices when selecting the kinds of saltwater fish and marine life, such as corals, to make up a miniature reef that you want to keep in the tank.
However, do not purchase a large tank if you cannot afford the right equipment to run it properly, instead go for a medium sized saltwater fish tank.
On average most people choose to have a tank that is around 30 to 55 gallons in size.
Is It Hard To Keep Saltwater Fish? When it comes to keeping saltwater fish, there are some breeds which are much better able to cope with changes in their lives than others.
However, it is important that you learn as much as you can about each variety of saltwater fish you are considering purchasing for your tank before you do.
By knowing about a breed of saltwater fish will help you to understand better how to help them with getting use to their new home and lead much happier lives.
Also if you can, spend time at the store where you are going to be purchasing your fish from, to see how well they are coping with the changes that have taken place.
Although they may seem healthy when you first visit the store, be aware that once the saltwater fish are moved to your tank at home, this move may be one too many for them in what may have been a very short life.