Page 32 - BKKS National Show Programme 2018 highres_Neat

Figure 2. Plants continuously use oxygen to respire whether Figure 3. During the night photosynthesis stops but
during the day or the night. During daylight hours plants make respiration continues adding to the demand on dissolved
much more oxygen than they use for respiration. oxygen.

Ponds with a large amount of algae or blanket weed growth The sheet of water tends to shear the larger bubbles of air
may need extra supplemental air at night when the plants formed at surface entry into smaller ones below the surface.
are not producing oxygen but consuming it. This action can occur at depths of up to a metre or more
and result in oxygen transfer to a much larger amount of
Air stones water than just that which is entering the pond. For most
Almost all the oxygen that dissolves into water from an air situations, the amount of water flow is determined by
bubble occurs when it is being formed. Only a small amount filtration requirements. DOCK KOI Supplier of Champions
occurs during the transit to the surface and due to surface Oxygenation during transport
disturbance. Air stones making many small bubbles are
better than those making fewer larger ones although the When koi are bagged for transport, use only enough water BKKS National Koi Show 2017
breaking up of larger bubbles into smaller ones also repeats to just cover the dorsal fin. Squeeze out the air in the
this formation and transfer process. bag and slowly fill it with oxygen until it is nearly full. This Adult Champion Koi - Kohaku Size 5 Breeder Okawa
is sufficient oxygen for up to 24 hours. If oxygen isn’t
Fine bubble diffused aeration maximises the total surface available, just the air in the bag will be sufficient for an hour
area of the bubbles and thus transfers more oxygen to the or so. Baby Champion Koi - Kohaku Size 2 Breeder Okawa
water per litre of air. Additionally, smaller bubbles take Sakura Champion Koi - Utsurimono Size 7 Breeder Ogata
more time to reach the surface allowing them more time to If a transport tank is being used for moving fish, an air stone
transfer oxygen to the water. However, air stones should can be fed directly from bottled oxygen. Alternatively, a low Best Doitsu Go Sanke Koi - Doitsu Showa Size 4 Breeder Ogata
not be placed at depths greater than about two meters to voltage air pump or a mains pump and an electronic inverter
avoid the risk that the nitrogen in air bubbles will be ingested may be used, either of which can be powered from the Best Doitsu Non Go Sanke Koi - Asagi/Shusui Size 5 Breeder Ogata
and cause gas bubbles to develop in the bloodstream which vehicle’s low voltage supply.
is known as decompression sickness.
Power Loss
Waterfalls, showers and water blades Young Koi Show 2018
Mains driven air pumps with a battery backup in case of
A “sheet” type waterfall or water blade provides more power failures are available. A power loss obviously causes
dissolved oxygen than “cascade” type waterfalls whose the oxygen concentration in the pond and biofilter to drop Grand Champion – Ginrin Showa Size 5 Breeder Ogata
velocity is low when the water finally enters the pond. and ammonia to start building up. The stocking rate of the
Although cascade waterfalls provide aeration of the water pond will determine how long it can be without aeration
that is entering the pond, the sheet type provides better
aeration of the water that is already in a pond.
“…. use only enough water to just cover the
dorsal fin.… We are an established Grimsby (North East Lincolnshire) based supplier of high quality Japanese Koi Carp, which we import direct from Japan. Every
piece is personally hand-selected in Japan by Neil from a small number of suppliers only. All our koi are fully quarantined on their arrival into the UK
Smaller bubbles and a deeper release point will ...Squeeze out the air in the bag and slowly so this means that we are able to supply disease free healthy Japanese koi of all varieties, sizes and prices that are affordable to all koi keepers. We
generate a greater oxygen transfer rate fill it with oxygen until it is nearly full. This is are also stockists of a large selection of the leading brands of pond equipment/koi food and treatments.
(Taparhude, W 2002) sufficient oxygen for up to 24 hours. If oxygen
isn’t available, just the air in the bag will be
sufficient for an hour or so.” www.dockkoi.co.uk email:- dockkoi@btinternet.com

32 Unit 3, Block 1, The Beam Station, Humberston Road, Tetney DN36 5PE Tel: 01472 811259

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