I have a fish pond in my back yard. With four (used to be five) big fish. There is a pelican that lives around my house that has killed one fish that I know of. How with out killing the bird can I protect my fish? I have a net over it but this is not visually pleasing, are there methods or devices made for this problem?

I have heard that a weeping willow is a voracious drinker and will 'drink up' standing puddles of water in a yard, but will it drink so much as to make it a problem for my pond and its inhabitants? (the pond is a square 1/2 acre and is about 12 feet deep.) It is my wife's favorite type of tree and I would like to plant one for her.
The pond is supplied by runoff and will not quickly refill without sufficient rainfall.

I am looking for an environmentally safe and effective way to remove the cat tails from the ponds on my property. I would like to remove most or all of them as they are overpowering the pond.

I want to make an inexpensive water pond and i am not sure how to do it. Anyone with any ideas or websites to go to?
The kind of water pond i am wanting is like a goldfish pond in the yard. I do not want one of those black hard plastic inserts in the ground, i want a rock one.

I have a lot of algae build up on my lights and pumps for my pond, the pumps and housings for the lights are plastic. What can I use to get them looking new again?

My pond is rubber-lined and doesn't seem to be holding water like it should. Is there an easy way to find a hole in the rubber, if that is the problem?

There is about a 1/4 inch of clay in the bottom and on the marginal shelves of my 300 gallon pond. I have not added fish or plants yet. The water is already murky but has only been in the pond for 3 days. Should I empty and refill before proceeding with living things or just let it sit for a few more days first?

I have a 4ft by 3ft frog pond and water won't stay in it for more the 12 hours.I want to keep it filled without using a nylon or any type of liner.Oh and its about 1 foot deep.

I bought 2 Koi on accident thinking they were gold fish, and now I really want to build a koi pond in the back, a small one. No water fall. Just simple and not too deep unless its needed. How much do you think it would cast to get that done?
Wow thats expencive! I'll go for the neighbor kids..lol

I'm not really sure about when I should quit feeding for the winter. And I was Hoping experienced people could share tips. The Pond is 200 gallons and Home to Large goldfish and Koi.