Pond in a barrel or old water tank

I have just watched a very interesting GW in which Nick Bailey  planted a mini-pond in an old, large barrel. I would love to do the same, with an old water tank . We have only one problem. Mosquitos. No, this is not UK. Is there any way I can keep the insect population low, without using environmentally unfriendly chemicals. Mosquitos are filthy insects that cause many diseases, There are a large number of small lakes nearby. It's not a threatened species. I just don't want them near the house.

Nice to see the weather in UK picking up.