Summer is a great time for the pond enthusiast.
For the most part, he can pull up a lawn chair, sip a cup of ice cold lemonade, and just sit back and enjoy the fruits of his labor. There are, however, a couple of items to consider. The warmer that water gets, the less oxygen it can hold. At the same time, the fishes metabolism increases, so they need more oxygen than ever. This presents no problem for a few small fish in a large pond, but in the more common, crowded pond, dissolved oxygen can easily become depleted.