You should now have a great hole in the ground, lined in either black plastic, pond liner or fibreglass. The next step is to fill it. Just put the hose in and turn on the tap.
Now you have a hole with water in it! Very soon, if you don’t do something with it you will have a hole with water in it and about a billion mosquito larvae. No one wants this. So you’ll have to make some decisions.
FISH
The first consideration is fish. Tadpoles don’t usually eat wrigglers (mozzie larvae). They are mainly herbivores and will feed on algae to a certain extent and pond plants as well as other microscopic bits. An interesting bit of information is that taddies will eat their own refuse, including dead mates and other stuff floating on the bottom. So to combat your mozzie problem you will need fish of some sort.
Gold fish, comets and other pond fish look nice. A little warning though; hungry koi will eat tadpoles. I found this out when they desimated my introduced taddies. They will need a filter system to keep their water clean and oxygenated. Gambusias caught from the local swamp are good because they keep the mozzies at bay and will live in appalling conditions. But both of these will probably eat most of your frog spawn once you get to that stage.
Another alternative is a native Western Australian fresh water fish called a pygmy perch. You can get them from specialist fish stores, but they tend to be expensive (around $4 for a tiddler). I found that they simply disppeared from my pond at a rate of about half that I bought, and they weren’t that effective on the mozzies. I was assured that they would not eat frogspawn, but as yet this hasn’t been tested in my pond. Minnows are another native fish which will not eat frogspawn, but I’m not sure where to obtain these.
I have a mixture of my remaining pygmy perch and gambusias in one pond and koi and goldfish in the other pond. So for one of my ponds at least there is the issue of filtration.
FILTERS
The sound of running water is music in a backyard. Therefore a filter system of some sort for your pond is a great idea whether you think you need it or not. A small filter will not set you back too much. It will clean your water to keep it looking clear and appealing. You can also rig it to create a waterfall of sorts. I use an old bucket and pipe the water from the pump up into the bucket. The bucket is tilted toward the pond and as it fills the water overflows back into the pond. It has a very quaint effect, and the sound is really soothing. Some pumps also have little sprinklers you can set up to give the tinkling water sound.
A little tip I picked up from a guy at Watergarden World to calculate the cost of electricity for a year of running your filter 24 hours a day (recommended for koi and goldfish) is to multiply the wattage of your pump by 1.24. This will give a princely sum of about $30 for a 24W pump, ample for filtering a pond about the size specified as a minimum.
PLANTS
The next thing to consider is plants. Frogs will use these to shelter under, on and within while enjoying the water and they will use them as an anchor when laying their spawn. There are a seemingly endless variety of pond plants available, so have some fun with it. I have pond lillies. These are a good water oxygenating plant, good for the health of your pond. Also some umbrella grass and dwarf papyrus; these give my pond height. Water iris is another one. I can’t wait for it to bloom!
Most pond plants propagate themselves and can be easily divided when they out grow their pots. So if you have friends or neighbours with ponds you can help each other out there. Make sure you use pond soil to re-pot though as normal soil washes out too easily and mucks up your pond.
With your fish, filter and plants now installed you are really set. Just one last tip. Tadpoles are very sensitive to chlorine so don’t introduce them for about 7 days after you have filled your pond. Have fun with your frog pond!