Can a river be used to separate fish?

My current setup is two pre-formed pond liners. The larger one is about 200gal and has a waterfall spout at one end which pours into the smaller pond of about 75gal. The larger pond has the grown fish... comets, shubunkins, and two very large koi who are desperately pleading for a bigger space. The smaller pond is mostly stocked with rosey reds (the feeder minnows).

The advantage of this setup is that, because of the waterfall, any goldfish which hatch out are swept over the falls and grow up in the lower pond. This gives them a fighting chance, so the big fish don't eat

all of them. I generally end up with about 4 survivors by the next Spring, which then grow large enough to move up to the bigger pond.

via gardenpondforum.com

Interesting use of two preformed pond liners here, with a river to help in the raising of small fish.

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preformed ponds and kits

Preformed Pond Kits, Articles Mag

If you need to get Plastic Preformed Pond, the best location to dig up
the information you want is on the World wide web. You will discover
many of resources available on the topic.

Father's Day Gift Idea: Do-It-Yourself Backyard Pond Kit | Pond Pumps
Traditionally, preformed ponds trays large, very complex anddifficult
to transport. For example, a typical preformed pond kit would have a
size of a box that is 60 "x 48" x 24 ", a strain which is great for
many cars.

Preformed Pond Liner - Two Ponds - Buy Water Garden Supplies ...
We have two ponds in our garden, they are not very big maybe 200
gallons, like a huge bathtub. They have plants and fish in them but
they are always so interesting.

Oase Pond Pumps - Are They the Answer to Your External Pond Pumps ...
Oase pond pumps will ensure that you have that quality at your
disposal. ... Methods For Getting Rid of Annoying Koi Pond Algae ·
Preformed Ponds ...

pond liner - Vox
Have a look at the pre-formed fish ponds in a garden or pond centre to
see if you like those shapes and sizes. If you do not, then you can
procure a butyl liner for a flexible shaped pond.

preformed rectangular ponds

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Preformed Ponds and Water Gardens

Preformed Ponds, Water Gardens and Pumps

Fibreglass Garden Ponds for the Water Garden

Fibreglass garden ponds are a quick and easy solution to getting a
professional pond installed in your garden in a matter of days.
Luckily there are many types of preformed garden ponds on the market,
thanks to the sudden popularity of water gardening. But Pond Liners
can also be used In Outdoor Pond Building, in fact every outdoor pond
needs a good pond liner. The size of your pond, the intended shape,
and, of course, your budget are some of the things to consider when
picking out a liner. Pre-formed pond shells and flexible liners are
the two most popular ways to build a long lasting garden water
feature. Backyard Pond Building, Rock Gardens and Ponds

Pre-formed liners are usually used for smaller ponds. These can be
bought at pond supply outlets and can be easily installed after
digging the pond. However, if you want to create the design and size
you want, then good butyl pond liners will worker better .

Rock Gardens and Japanese garden ponds. I'm planning on getting
another preformed pond that cascades water into the original one I
have now and add smaller rocks for the water to tumble over. Plus I'll
be adding more plants, maybe an underwater light, a water filter and
maybe a bamboo water fountain.

How to build your own garden pond: Always put in at least a 3 ply
plastic liner.You can also purchase a preformed molded liner. Now
install your fountain either in or at the end of your pond if a
fountain is your chose.Or build your waterfall at one end of the pond.

How to Install a Preformed Rigid Pond in your Yard

Preformed ponds are a great solution for first-time pond owners, as
they are often much easier to install and maintain than ponds made
with poured concrete.

Preformed garden ponds. One includes waterfall. included are 3 pumps,
2 lg filters, UV and all plumming. Some extras included.
Fibreglassing. Preformed Pond
This is the biggest pond (lake) to be lined with polyurethane foam and
fibreglass in the UK as of April 2009. Filmed in a first person view
by one of the builders

Preformed ponds can be used as well. This Florida USA based ponds
liner supplier is expert on building ponds. Choosing between preformed
ponds and liners 75 ...
preformed pond liner.

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Chatsworth House Pond Sulpture

CHATSWORTH, ENGLAND - SEPTEMBER 10: Narcissus garden by artist Yayoi Kusama adorns the garden pond of Chatsworth House on September 10, 2009, Chatsworth, England. World renowned artists Antony Gormley, Henry Moore, Marc Quinn and Richard Hudson are amongst the cast of leading international artists appearing at the 2009 Sotheby's 'Beyond Limits'. The exhibition will feature more than 25 monumental modern and contemporary outdoor sculptures by artists from 14 countries and will run from from September 14 until November 1.

preformed ponds are the key

preformed ponds

 Preformed Garden Ponds

 Preformed ponds are the key to building your first garden pond, OK,
they might not be as unique as a custom built pond liner pond, but you
are going to save yourself some.work and worry by installing a
preformed garden pond and if you us preformed pond kits,they can make
your water garden look very natural indeed.

 If you are looking to attract local wildlife into your garden, or just
want to give your yard a more natural feeling, then one possible
solution that you should consider is the idea of using a preformed
pond kit with a bio edge.

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Preformed Ponds

Preformed Ponds or Flexible pond liners?

 Well I have a Butyl pond liner in my semi formal pond but I'm thinking
of replacing it with one of those preformed ponds at some point
when it starts to leak too much.

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Preformed Ponds

Preformed Ponds for Coldwater Fish

If you want to keep cold water fish in a good environment then I think preformed ponds are one of the best ways to go. The advantages of a preform are mainly on the ease of constructions side, but there's also the consideration that a preformed pond is made of string, rigid durable material and therefore less subject to the possibility of leakage, leading to loss of water and stress to the inhabitants, maybe even death.

Pond liners and Preformed Ponds

Keeping coldwater fish is a nice thing to do, and if you start off with a small fish tank or even goldfish bowl indoors, then the interest will be kindled and a some point the desire to keep more or bigger fish will lead to the idea of installing a garden pond. If you are keen on nature conservation then a garden pond is a great idea because you can keep native coldwater fish, plants and amphibians. I'm not saying a pond liner is a bad idea, just that preformed ponds make a better alternative in most cases. The exception is where you want a very large pond or a special shape that isnt available as a preform.