How do fish evolve into man made canals and lakes?

Question

How do fish evolve into man made canal and lakes? Are they put in there by man himself or do they grow from bacteria?

Answer 1

Some water fowl carry fish eggs on their feet.

Answer 2

Your question is based on failed assumptions.

Fish "get" into man-made lakes by a process called stocking. A stock truck is a tanker on wheels that's full of hatchery fish. It backs up to the lake and dumps the fish in the lake.

If there's a canal, there's a natural body of water on each side of the canal. Fish swim through the canal...some make homes there.

Answer 3

Fish do not "evolve" into a canal or lake. Most of the time people put fish in canals/rivers. I've also hear that birds can somehow transport them from a different body of water.

Answer 4

Evolution really doesn't play a part in that.
Most man-made lakes/canals are attached to natural waterways in one way or another (usually by small streams). Therefore, a fish could swim from those natural waterways into the man-made ones.
For the few man-made lakes and canals that are not connected to other water sources, then most likely man has transferred the fish there.

Answer 5

People put them in there most of the time. Like one of the previous answerers said, macroevolution has an extremely long time scale (supposedly millions of years) and most lakes and canals were manmade in the last 200 years.

Also, lakes are made from damming up a natural river so there are usually fish species present already.

Answer 6

Fish are put into man-made lakes by people.
Canals are attached to other bodies of water, which already have fish in them. The fish can just swim into the canal.

Answer 7

Birds dropping fishes. People stocking the lakes, and some canals flow into rivers, lakes and streams.

Answer 8

If a lake was made by humans (or beavers) damming off a river, then usually there are fish already in it.
If a lake is totally man made, fish are put there by humans -if they wish for the lake to have fish in it.

Answer 9

I don't think evolution works fast enough for bacteria to evolve into fish from within a man-made object, so it's either man put fry in there or they came over a dam, or escaped a bear or eagle.

Answer 10

they're stocked for the most part however theres a resivour here in San Diego called Lake Skinner that's fed by pipeline from the Colorado river 600 miles away. Striped bass make this huge journey on a regular basis which is pretty damn cool.

Answer 11

Some fish have evolved many different methods of getting to new water sources. Ships often dump their bilges and it is water that is used to stabilize the ship. That sort of dumping, usually illegal, probably accounts for much of it. Many fish can crawl over land. They get washed in by floods and some like bullheads stick to the bodies or of ducks. Fisherman and sometimes the government bring in many as bait or fish to catch.