Freshwater biomes are communities of animals and plants in regions with water with less than 1% salt concentration. · Types of freshwater biomes include lakes, rivers, ponds, streams and some wetlands. · Freshwater regions can be found on every single continent and cover about 1/5 of the world.

There are different types of freshwater biomes: ponds and lakes (Figure below), streams and rivers, and wetlands.

goldfish

Of course, different species of fish will have different abilities, as well as different levels of vision. In most cases though, yes, fish are able to recognize their owners and in some cases form an attachment. The fish will come over to their recognized owner who often offers a food treat or reward.

No, fish do not get “sad” if another fish dies. Fish do have a brain that is capable of some type of “emotion” but not to the extent that humans feel. They don’t feel anything like sadness but may feel something to a smaller extent. Another study indicated that they feel something similar to pain.

If your fish has been suffering from a severe illness and none of the treatment methods have been working, euthanasia might be the best choice. It may seem harsh to end your fish’s life, but it might actually be the kindest thing you can do – especially if the fish is stressed and in pain.

Sick fish may lay at the bottom of the tank for long periods of time and seem lethargic. Some sick fish may rub their body on tank décor to scratch themselves. Sick fish often acquire a dull color and turn pale or gray. The tails or fins of sick fish may be clumped, closed, stiff, or seem to be falling apart.

Water changes will not effect the growth of the beneficial bacteria in your bio-filter. Removing your sick fish in this case will not do a bit of good. In an established, cycled tank, removing sick fish is often a good idea.

It is important to note that it is very wrong to flush it or just dump it in a river, lake or stream. Flushing it down the toilet, throwing it in the bin or leaving it for wild animals to eat might upset the owner.

Sadly, a dead fish cannot be revived. However, all is not lost if you have lifeless fillets aging somewhere in your freezer since last summer. You will see ice crystals and signs of freezer burn on the flesh. Not good, but the fillets can be revived if you act very soon.

Because the fish live in the water, and the changes happen slowly, they adjust to it. When a sudden, large water change occurs, it causes such a drastic shift in the makeup of the water that the fish often cannot tolerate it and they die.