One can buy all types of fish pond supplies from Walmart, Amazon and ebay. Pet Smart also sell many fish pond supplies including food, water pumps and filtration units.
You buy them and out them in there just as if you have a aquarium.
buy one
You can buy it in the outdoor store, in the fish category.
You can purchase pond fish food from a Pet Store, in the fish department. It's important to ensure that the fish food is specifically for Pond Fish as this differs from food for Tank fish. You can also buy Pond fish food from online retailers however it might be difficult to get specialist advice over the internet.
you have to fish one up from the Peabody pond or buy one
I think your only option is to go to an outdoor retail store that sells tents and ask a sales associate to tell you which one is best to fit your needs. If you don't want to buy what is in the store, then you will have to do some online research to find the best price.
don't get trout get either koi fish or a big goldfish if you already have fish in your pond don't put in trout because it might not be adapted to pond life or the other fish [if you already have some]
Buy a fishing pole. Go to the pond. Then start fishing in the pond until you fish out some rubbish.
you can use a fish zapper. you can buy then at wal mart and sams
There is so very much information you need that it is absolutely impossible to give it all here. Maybe you should either buy a book on ponds from your local pet shop or get one on loan from a library.
You cant in the normal sims 3, but you can buy a fish bowl and either click on it and buy a goldfish, or you can catch a fish from a pond and put it in. Fish need to be feeded regularly to live. If you don't do that then you have to buy an expansion pack.