When designing your pond there are a number of factors you will have to consider as a matter of course for the project to ever get off the ground. These will be things such as location and construction method.
In addition to these essential considerations, there are a number of other things to consider that won’t stop you having a successful pond but may make a huge difference in how easy it is to manage and maintain and also what type or quantity of fish you are able to keep.

Whilst size will have been one of your essential considerations in pond design, it may be worth re-visiting your choice. If your pond is intended for fish and you have limited the size for budget reasons rather than available space, then it is important to consider that the larger the pond, the easier it will be to maintain. A larger volume of water is more stable in temperature and chemical makeup which will aid fish husbandry.

Plumbing and wiring
Designing your pond with adequate filtration and cleaning capacity will be much easier than retro fitting at a later date. It is also worth having a water supply either positioned close to the pond or even an automatic water top up using a ball cock. Either approach should save much time rolling and un-rolling hosepipes, during summer in particular.
Shade
Providing some shade for your pond will give the fish somewhere to hide in the midday summer sun. Providing shade will also have an influence on the additional wildlife you can attract. Not only this but shade is an important tool in tackling algae and blanket weed which thrive on direct sunlight.