Free No. 4a
Transcription
Free No. 4a
Free Download No. 4a What’s inside? 2 AKCA Judges’ Corner - Tancho 7 Advantage Bottom Drain System 11 Artist’s Corner – Fused Glass 16 Ramblings - Water Changes by Dr. Jason Guevara, AKCA Candidate Judge by Jeff Walker by Dale Rohrer by James Reilly, former ZNA NA District Chair Like us on Facebook! www.facebook.com/Koi USA Magazine Tancho koi photos by Michael Hernandez; crane photo courtesy of Wikipedia TANCHO SHOWA TANCHO TANCHO SANKE Judge’s Corner Dr. Jason Guevara, AKCA Candidate Judge Tancho T he Tancho is a legendary Red-crowned Crane (Grus japonensis). The Japanese Crane is the second rarest Crane in the world and in 2004 became the National Bird of China. The Crane has a white body, black neck and tail, with a brilliant red circle on its head. Legend has it the Tancho can live 1,000 years and it is featured in many myths and legends. In Taoism, the Tancho is a symbol of longevity and immortality. The Shang Dynasty tombs depict pictures of an immortal fl ying on 2 KOI USA a Tancho. Even the Zhou Dynasty had Tanchos on ceremonial bronze ware. Because of the legend of the Tancho living 1,000 years, the Series D 1,000 yen note has two Red-crowned Cranes on it. The National flag of Japan also shows a red sun on a white background. In koi, a Tancho refers simply to a single red crest on the head. This is a variety and not a true breed. If you breed two Tanchos, one seldom has offspring that are true Tanchos. They are a unique variety that happens by chance. We usually think of a Tancho Kohaku because this is the closest to the main definition, but Tancho is present in all Gosanke and multiple other breeds. The King of Tanchos is the Tancho Showa because it has a fully patterned body and is powerful. I believe that the Tancho Showa resembles the Red-crowned Crane. If there are other hi spots on the koi, then this is referred to as maruten (crown on head). When a kuchibeni (lipstick) is present, this is not a true Tancho. A true Tancho has only one hi spot on the head. Tancho koi can be all different breeds like Gin Matsuba, Goshiki, Kujaku, Goromo, Hariwake, Asagi, etc. – all of whom would be judged in non-Gosanke categories. Judging a Tancho is based upon symmetry. If you divide the head in two sections from front to back (vertically), the hi pattern should be the same on both sides of the imaginary line. Another line is drawn between the eyes creating a horizontal one; 1/3rd of the ideal Tancho spot is located below the eye line to the nares but not involving them and 2/3rds of the Tancho will be located up to but not including the shoulder. The largest hi spot centered between the eyes but not covering them is preferred. The ideal Tancho spot is a natural perfect circle. The hi may have a flow- Honorable Kunihiko Saito, Ambassador to the United States, looking through KOI USA Magazine, presented to him by Mr. Chuck Poppe as a gift from Zen Nippon Airinkai Potomac Koi Cub. Colonel CHARLES R. POPPE, USMC (Ret.) Charles Raymond “Chuck” Poppe passed away on March 31, 2014, at the age of 84. Beloved husband of Doris P Poppe: father of Stephen C. Poppe and Susan P. McKenzie: grandfather to Erin J. Poppe, Eric C. Poppe, Stephanie A. Poppe and Tamara K.M. Cain. He was taken quickly from us by leukemia. Chuck was born and attended college in California before entering the USMC in 1951. He completed a 28 year career with service to his country in the Korea and Vietnam Wars. After retiring from the Marine Corps, he started Poppe Associates, a consulting firm which he successfully ran for years. Chuck developed an interest in raising and showing koi, culminating in being recognized as an AKCA & ZNA Judge Emeritus recognized worldwide. Interment at Arlington National Cemetery with military honors will be announced. In lieu of flowers, memorial contributions may be made to the Marine Corps Heritage Foundation at www.marineheritage.org. Please view and sign the family guestbook and at: www.everlywheatleyfuneralhome.com Tancho Criteria (100 total points) 1. LOCATION (50): 1/3rd below eyes, not including eyes, nares or shoulder. 2. SIZE (20): The larger the better. 3. COLOR (10): The deeper the better. 4. BACKGROUND (10): Brightest contrast is best. 5. SHAPE (10): Round is preferred. May/June 2014 3 er pattern, or be square, heart shaped (Hato Tancho), diamond or oval. The skin quality, width of the head, deepness of the hi pattern and the shiroji are just as important. It is preferred to have a white background on the head and a snow white body. When judging Tancho Sanke and Tancho Showa, the sumi needs to be up for the show. For the Tancho Showa, if the sumi on the head forms a V shape without interrupting the hi spot, this is preferred. I believe that even though the Tancho is not a true breed, it should be in its own category at a show. A beautiful Tancho Kohaku would not be judged higher than a fully patterned Maruten Kohaku if the body conformation, skin quality and shiroji were the same. Tancho koi can be all different breeds like Gin Matsuba, Goshiki, Kujaku, Goromo, Hariwake, Asagi, etc. Tanchos occur in all variety of colors. The classic is hi but a ki Showa may have a yellow Tancho like a Tancho Hariwake. The Tancho may be black, white, red, yellow or multicolored (like in a Tancho Budo Goromo). When judging Tancho Gosanke, then hi is preferred. The deeper the color, and the brighter the head background, the better. And most important of all is the location. I think the Tancho should be included as two separate varieties at a show – Tancho Gosanke and Tancho everything else. Young Tanchos may have a deep red hi, but if it should fade from genetics, stress or water quality then the hi will most likely never come back. 2 AKCA JUDGES 4 CERTIFIED (9) 1997 Larry Christensen Pat Christensen Steve Drake 2000 Garry Chin 2001 Norman Call 2004 David Young Pam Spindola 2007 Tom Ayers 2009 Jan Thompson Portland, OR Portland, OR Carlsbad, CA Sacramento, CA Idleyld Park, OR Tucson, AZ Santa Ana, CA Tucson, AZ Pueblo West, CO 503-531-3303 503-531-3303 760-729-3649 916-922-2525 541-496-3403 520-682-7697 714-544-2326 520-247-3322 719-547-4747 LRCConst@hevanet.com LRCConst@hevanet.com stevedrake@aol.com scvkoi@yahoo.com ncall@centurytel.net koiman@mindspring.com pspindola@earthlink.net azkoiboy@yahoo.com iamjant@hotmail.com EMERITUS (5) 1994 Bob Finnegan Galen Hansen 1995 Joan Finnegan 1997 Burt Ballou 1999 Larry Gill Costa Mesa, CA El Cajon, CA Costa Mesa, CA Fountain Valley, CA San Leandro, CA 949-548-3690 619-440-2035 949-548-3690 714-839-1836 510-352-7168 koifinns@gmail.com Galenkoi@cox.net koifinns@gmail.com burtb@socal.rr.com gelldu@sbcglobal.net CANDIDATES & APPLICANTS (4) Vik Nair Philip Gray Jason Guevara, M.D. Brian Liljas Seattle, WA Freeport, NY Aberdeen, NC Puyallup, WA 206-696-3624 516-967-4666 910-322-2234 253-677-5321 viknair@aol.com philiegray@mac.com Unispacer@aol.com bliljas@comcast.net KOI USA AKCASTORE Books • Posters • NEW! Koi ID Poster with All New Larger Photos Can’t tell your Kin Showa from your Yamatonishiki? Help has arrived! This 19˝ X 27˝ poster features 44 full color photos, covering every major class, and most minor variables. Each has the name, and a brief description to help you identify what you have swimming in your pond. Banish Koi-name-phobia forever! CAT ID # 1204.....$7.95 NEW! Koi Health and Disease By Eric L. Johnson, DVM 2006 Reload - For all us ELJ fans, this is a welcome update and it remains classic Doc Johnson. It has additional sections, some of the old sections have been updated, a more extensive table of contents and a better, much more complete index. It has the same convenient spiral binding as the first editions and has 204 pages, expanded from the 187 pages of the “Appendixes” versions. If you own one book on koi health, this should be it. CAT ID # 10501 .....$37.95 Advanced Koi Care for Veterinarians and Professional Koikeepers by Nick Saint Erne, DVM Contains all of the need-to-know information concerning every aspect of koi keeping. The pictures, images and illustrations are clean, accurate and descriptive. This helps make this text the most comprehensive one available on koi medicine. It is a one-stop reference for anyone involved in koi. (spiral bound) CAT ID # 10201.....$65.00 Judging & Buying Koi Judging and buying koi are mysterious subjects to many koi hobbyists. This book hopes to de-mystify these subjects. Included are over 40 articles about the topic of judging and buying koi. KOISHI by Mamoru Kodama Koishi is written in an interview style by Mr. Kodama. Kodama personally visited each of these breeders in Niigata, Japan over a period of 20 years to gather this information. The topics covered in each interview include: • History of each Koi farm • Breeder’s policies • Size of operations • Breeders’ methods and practices • Best time to visit them • The most important points to remember when you purchase their Koi • Description of the breeders’ koi CAT ID # 10302.....$59.95 AKCA Guide to Koi Nutrition II CAT ID # 1051.....$3.00 CAT ID # 10191.....$13.00 AKCA Guide to Pre-Filters and Filters CAT ID # 1053.....$10.00 AKCA Guide to Pond Construction CAT ID # 1052.....$10.00 • T-Shirts • Pins • Videos • and More! NEW COLORS! AKCA T-shirts CAT ID #1229 Navy blue ............... $20 CAT ID #1216 Carolina (light) blue .. $20 New CAT ID #1231 Red .................. $20 New CAT ID #1230 Caribbean blue . $20 T-shirt (without pockets) has a large AKCA Showa on the back and a small AKCA logo on the left chest; available in men’s sizes S,M,L,XL,2XL &3XL. Basic Koi Pond, Filters and Water Quality Pond Construction and Natural Filtration Learn to design and build a koi pond and filter system and the importance of water quality. Learn through the experience of others. CAT ID # 1102 .....$5.00 covers basic pond construction, filtration and many other aspects of Koi keeping. See numerous beautiful ponds, plus detailed instructions on how to build a biological filter. CAT ID # 10123.....$13.00 Kokugyo Vol. 2 Nishikigoi Development This book, by Mr. Mamoru Kodama, provides a detailed explanation of how koi change as they grow. Over 190 great pages to learn from! See sample page. AKCA Koi Cap I ™ Koi Visor CAT ID # 1214 .........$10.00 CAT ID # 1215 .........$10.00 TO PLACE YOUR ORDER: CAT ID # 10301.......$95.95 Order online at secure website www.akca.org Order with credit card by calling (949)275-8672 2006 Niagara Seminar T-Shirt Order online at secure website www.akca.org Order with credit card by calling (949)275-8672 (S, M, L, XL) without pockets CAT ID # 1212 .........$5.00 Mail order by check or M/C or VISA credit card to: AKCA Bookstore P.O. Box 10879 Costa Mesa, CA 92627 Shipping and Handling 1994–2004: pins $2 California residents (except 97, 98, 01 & 02 - which are out of stock) add 8% sales tax Shipping chart does not apply (and the website cannot be used) for International Orders. AKCA Logo Pin CAT ID # 1202-L ....$3.00 Also available past seminar pins 2005-2010: pins $3 Merchandise Total $ 1.00 — $29.99 $30.00—$49.99 $50.00—$69.99 $70.00—$99.99 $100.00 and up Add $7.50 $9.75 $12.00 $13.75 $16.00 Why is a bottom drain so important? One of the most common mistake beginners make when designing and building their first pond is to fail to install a bottom drain in the pond. Often times they think the only purpose for a bottom drain is to provide a way to drain the pond if necessary. The reality is that a bottom drain is an extremely important part of a well designed koi pond. A well placed bottom drain, more accurately called a bottom return, provides a very important function. It will help collect any debris and fish waste that might settle on the bottom of the pond and send it to the pond filter where it can be removed from the system. Having a koi pond without a bottom drain is like having a toilet that you can’t flush. Unfortunately, most bottom drains available today are of a similar design. They consist of a top lid attached to either a simple bulkhead or a bucket type assembly. The purpose of the lid is to allow debris to enter the drain while keeping your koi out. The problem is that if, on occasion, the bottom drain happens to get plugged up, it can be very difficult to unplug. If while attempting to dislodge any debris from under the drain cover lid or while back flushing the drain line you happen to knock the top cover lid off, you are in trouble! The only way to reinstall the top lid is to either drain the pond water most of the way down and then climb in or dive to the pond bottom and then physically reattach the lid. Either way, this can be an extremely chilling experience during the winter months. The Advantage Bottom Drain Covers were designed to solve this problem. The Standard Bottom Drain Cover is 14” in diameter and weighs approximately 25 pounds. It has 3 adjustable legs so you can customize how high above the pond bottom your drain will sit. One real benefit of this drain cover is that it is not attached to the drain opening. In the event any debris was to collect under the drain cover the solution is easy. You simply turn off the pump, using a net on a pole, slide the drain cover to one side, net up any debris near the drain and then slide the drain cover back into position over the drain hole. If the blockage is further down in the pipe and you have a standard Advantage Filter or an Advantage Plug and Play Filter System, the blockage can easily be removed. You can do this by simply placing the filter in the closed mode, reversing the unionized check valve between the pond and the pump and then turn on the filter’s blower. This will send a wall of air back down the drain pipe, dislodging any debris. Again, after the blower is turned off you simply net up any debris around the drain and then slide the cover back in place. It’s that easy. The Bottom Drain with Built in Air Diffuser has all the advantages of the Stan- dard Drain Cover but comes with a built in air diffuser for adding oxygen to your p o n d . This drain requires a 3/4” line to be installed stubbing up 14” away from the center of the bottom drain and a 5” flexible rubber hose which connects to the drain cover. This way air can be delivered to the The Advantage Bottom I US drain cover and yet the drain cover can still easily be lifted up or slid to one side if needed. The Retro Bottom Drain Cover was designedly to easily add a bottom drain to an existing pond that was built without a drain. This drain weighs approximately 40 pounds and comes with a built in 2” side port. This allows you to connect a piece of 2” flex hose to the drain and then place it wherever you want in the pond. The Retro Bottom Drain draws directly off the pond bottom and provides a relatively low profile which allows the suction line to be installed close to the bottom contour of the pond. Again, because this drain is not attached to the pond bottom it can easily be lifted up slightly or moved to one side to assist in removing any debris that might collect under the drain. In addition to their easy to service design these drain covers are also exceptionally easy to install. When installing a conventional bottom drain in a concrete pond you are faced with two problems. One is that the drain needs to be plumbed in place before you begin to pour the cement or shoot the gunite. It can be challenging when adding the cement to get the pond sides and bottom contour to make a smooth transition that lines up exactly with the finished edge of the bottom drain. Often times, once you get the pond contour perfect you end up a couple inches too high or too low at the drain. The second problem is that it is hard if not impossible to pressure test the bottom drain pipes once the conventional drain is cemented in place. Most plugs that are inserted into the pipe and then expanded to create a seal will not hold more than 7 to 10 psi of pressure. With the Advantages Bottom Drain System you simply extend the bottom drain pipe straight up in the air approximately 24 inches and then cement an end cap on it. This allows you to not only pressure test the plumbing to 40 psi, which most building codes require, but you can leave it under pressure until all the cement work is finished, even down to the plaster. This way you can make sure that none of the pipes were damaged during any part of the process. Additionally, this allows you to concentrate on getting the pond contour perfect without being concerned with trying to end up with the contour at an exact height at the pond bottom. Once the pond is finished, the last thing you do is cut the pipe off even with the pond bottom and place the Advantage Drain Cover over the bottom drain opening. Sacramento Koi builds a lot of ponds in the central California area. We adopted this system about 5 years ago and couldn’t be happier with it. It is the easiest system to install and the customers love how simple they are to maintain. For more information on the Advantage Drain System go to www.sacramentokoi. com. 2 Jeff Walker Sacramento Koi 4670 Pacific St. #200 Rocklin, CA 95677 (916) 652-4231 Fax: (916) 652-4979 Drain System By Jeff Walker 38.3 KOIUSA.qxd 11/11/13 12:29 PM Page 47 A R T I ST ’ S CO R N E R Dale Rohrer FusedGlass Expo in Las Vegas where he exhibited two of his plates in the Gallery of Excellence at the show. Dale has also taken two classes from Author Gil Reynolds, one of the leading experts in the field. Fused glass Artglass can be produced in a very wide range of shapes and sizes. The colors are limited only by the selection of art glass you can find. There are many manufactures of glass around. The Bullseye Glass Company manufactures most of the glass used in Dale’s studio. The most important thing about the glass is that it must b e PHOTOS BY PROMOD ANTONY F used Glass Artglass Artist Dale Rohrer grew up in Milwaukie, Oregon and as a child developed interests in art, rock hounding and photography. He attended Clackamas Community College taking classes in basic design, art appreciation and pottery making. He furthered his education at Portland State University, graduating with a degree in general science. Dale maintained his interest taking classes in photography and jewelry and added science to his interests with various science courses. He was a member of the Clackamas County Camera Club for many years where he increased his knowledge about the technical and artistic side of photography. He also made rock tables and jewelry using semiprecious stones. One of his favorite stones is the fire opal, which he made into triplets. Some fire opal comes in thin layers surrounded by common opal. This type of opal must be separated from the common opal. You must cut and grind away the common opal to do this. One side of the opal in exposed and then glued to a black base layer to make a black opal. The top is cut and/or ground off and a quartz cap is glued to the top. The edges are then shaped to the quartz cap and you have a finished piece. For employment he worked for many years as a Computer Programmer/Analyst for Pacific Power & Light Company. Dale became interested in both stained and fused glass in the last few years. He has taken many classes about stained glass, glass fussing and other related subjects, the most recent of which was at the Glass Craft & Bead November/December2013 KOI USA 11 38.3 KOIUSA.qxd 11/11/13 12:29 PM Page 48 A R T I ST ’ S CO R N E R Dale Rohrer most often made by stacking three separate layers of glass and then fusing them. I usually start with a colored bottom layer of glass. My next step in producing a large plate is to use a circle cutter to scratch a line into the glass sheet. You can then use controlled pressure to run a line (fracture) around the circle to pre-break the glass. You then can use a hand glass cutter to make small cuts around the glass circle to remove it from the large sheet of glass. A top sheet of clear glass is then cut out and placed on top of the bottom sheet. The round glass pieces may have small areas, which need to be removed to smooth the edges. The easiest way to remove this glass is to grind it with a diamond coated wheel. This is now your "canvas" for your design. I then start building the design for the plate. I often start the design by using interesting shapes or patterns and build from there. These shapes a r e compatible glass. All of the glass used must have the same COE (coefficient of expansion). Different glasses will expand and contract at different rates and if this rate is too great stress will build up in the glass. If there is too much stress created in the glass the piece can develop fractures and even shatter. Some glass may be not compatible even with the same COE. This is why glass manufactures must test their glass to make sure it is useable for fusing. This is also one reason why art glass is very expensive. A single sheet of glass 36" X 20" can easily cost over $100 dollars. PRODUCTION OF LARGE PLATE The first step in the production of a large plate is the selection of the glass that will be used for producing my artwork. I try to use various colors and patterns that will complement each other. Plates are 12 KOI USA November/December 2013 38.3 KOIUSA.qxd 11/11/13 12:29 PM Page 49 PHOTOS BY PROMOD ANTONY Fused glass Artglass can be produced in a very wide range of shapes and sizes. The colors are limited only by the selection of art glass you can find. cutout using a small hand cutter similar to the familiar glasscutter that may be used to cut window glass. This is a very individual process. Everyone will have his or her own ideas for doing this. Stained glass pattern books are a good source of designs. You can also make your own patterns from your personal photos. FUSING PIECES Before you move your piece into the kiln you can glue the parts together using common household white glue and a toothpick. Just put a few small spots on each separate piece and let dry. This does not have to be done but can save you work if you are unsteady in loading into the kiln. If your unfired artwork has many small pieces or you need to transport it to someone else's kiln this can be especially important. Once the pieces are all cut out and arranged it is loaded into the kiln. SLUMPING FUSED PIECE It is then heated to a temperature of around 1450 1500 degrees Fahrenheit. This process takes many hours to complete. There are several stages the glass must go thru. These stages are heating phase, soaking phase, rapid cooling phase, annealing phase and cooling to room temperature phase. The various times and temperatures needed are programmed into the kiln's electronic controller. This makes up what is called the firing schedule. These processes cannot be rushed or the glass can fracture now or latter due to stress buildup. Slumping the flat glass over, into or through a mold makes the shape of the piece. The molds used can be made of clay, stainless steel or other materials. The flat glass is placed on the mold and then placed into the kiln. The piece is then fired to a temperature around 1200 to 1300 degrees Fahrenheit. This is another firing schedule that takes many hours to accomplish. These firing schedules will vary depending on the type of glass used and the size and thickness of the glass piece made. Telescope mirrors can take a year or more to finish a firing schedule. This is not a complete description of the process just the main processes. There are many good books available about glass fusing. There is also a lot of information available from the many manufactures of art glass. You can contact Dale at: 15211 SE 130th Drive Clackamas Oregon 97015 (503) 698-3379 http://artglassbydale.com/contact.php November/December 2013 KOI USA 13 ® Health. Color. Value. Premium Wheat Germ Koi Diet ULTRA BALANCE PREMIUM KOI diets are simply the best for optimum growth, health & performance of koi. • Nutritionally complete balanced diet. • Highly digestible for improved water quality. • Excellent for year-round use for fish 2 years and older. • Ideal for water temperatures above 41°F (5°C). • Diets include Natural Color enhancers. • No other supplemental feeding required. Available wherever fine fish foods are sold. For an Ultra Balance Premium Koi Food Dealer near you, go to www.KoiFood.com or call 888-330-3361 Ramblings JAMES REILLY FORMER ZNA NA DISTRICT CHAIR Water Changes I t is very tempting to take up the challenge of creating a closed system in which the water, benefited by unending filtration treatment, will never need to have water changed. But like turning lead into gold, no one has ever been able to realize this fantasy in real life. Living creatures ‘impact’ their environment and our koi are no exception. Some of you may remember when J-mat was made out of ‘horse hair’ (actually other organic fibers) and how long that material lasted once bacteria settled on and began breaking it down. And we all know of the power of water and bacteria to dissolve all material it comes in contact with - rusting, eroding, corroding and metabolizing. Our koi and associated microbes will, over time, add ‘things’ to a fixed body of water and ‘take things’ or use things up within that water. And the ever changing water will then impact the internal workings of the koi, who are separated from their watery environment by only a few layers of cells located at the ‘gateway’ – i.e. the gills. So like a submarine with a screen door, the gills must deal with the building metabolites both inside itself and immediately outside its body. And of course, a koi is subject to the pesky laws of osmosis and diffusion. One of the rapidly building waste products produced by koi in large, ever building quantities is phosphate. Today’s koi foods are LOADED with 16 KOI USA lots of essentials. And today’s koi owners feed lots of koi food! Not all this material can be utilized by the koi on an hour to hour basis and much of the packed nutrition and mineral content is simply passed out of the koi for bacteria to deal with in a process known as mineralization. These bacteria then use the ammonia or hand it off to the nitrifiers that we are all familiar with. But this is a process and some stages will take some time. And during that time, building nitrogenous materials like nitrate and residuals like phosphate will increase. All of this results in a high bacteria count, shifting water chemistry (pH, hardness) and loss of oxygen (ORP decline). Great heroics can be applied to try and stay ahead of this dynamic but the trend line is clear- the water is becoming polluted and burdened and at the same time, it is losing its proper gas saturation ratio and its typical buffering capacity. The solution? Use band-aids so as to ‘properly manage an over stocked pond’. Do what I call ‘chasing the parameters’ by adding gadget upon gadget in an attempt to manage excess and sequential changes in nitrogenous waste material species. Or possibly use resins, carbons and binders to try and mask the excesses of an impossible situation. Another solution: Use regular water changes to bring the excess build up and declining mineral/buffer content back to base line optimal read- ings. This would be in the area of alkaline reserve, ORP, nitrogenous waste (nitrate), phosphate, bacteria count, algal balance, and desirable gas saturation ratios. Amounts and frequency of water change is as much an art as a science. And depending on circumstances, wa- resins, carbons and filters represent money well spent. Some hobbyists have taken it even a step further and use this entry point as an opportunity to bring water to even a higher physiological compatibility with their koi by adjusting source water pH and hardness. Depending on your source wa- Most serious hobbyists use some form of pre-filtration to insure that raw water is not too raw. ter changes can be a breeze or a real pain! Source water quality is definitely a case of great concern. Most serious hobbyists use some form of pre-filtration to insure that raw water is not too raw. Here is where ter, you can devise a schedule and use testing for things like nitrate, phosphate, ORP, pH, bacteria count, BOD, etc., as guides to whether you are keeping up with the dynamics of the closed system. July/August 2014 17 Personally, I do two water changes a week, which is excessive for my particular system, but the koi really do grow and glow as a result. This is in addition to my routine of ‘sump dumping’ daily in summer and twice a week in winter. The amount I change is 1520 % in winter and as much as 2530% in summer. I used to do more but found that that much raw water (plus my CO2 well water issues) was excessive and becoming more of an un-stabilizing force than a stabilizing one. In designing your own philosophy and approach to water changes, first consider your stocking level and then your feeding schedule and food type. If we wish for a true optimal BASE LINE reading on these various parameters, we must appreciate that the koi population’s basic metabolism will require a certain minimal maintenance and countermanding, and THEN the type and amounts of food added from season to season will require an additional safety margin. This becomes evident when you shift from say, wheat germ pellet to high protein pellets- you can actually SEE the effect on water in a closed system very quickly. This is especially true if temperatures are not ‘right’ for food type and the bulk is passed through the fish semi digested. It is more complicated than some of the ‘experts’ suggest when they quote pounds of fish and pounds of food per fish = x size filter. Those numbers are the most crude ‘jump off’ point at best. And the art of the thing applies more than the science at some point. Certainly a 5000 gallon pond with 12 koi requires different considerations based on age and weight first but then you have to know the mix of protein/fats they are being fed and the 18 KOI USA temperature at which that mix is being fed. And you make a good point in that even in a stable pond as the fish grow you may need to modify your old water changing schedule/amount to accommodate the new and greater biomass. And accidental spawning throws a whole new ‘monkey wrench’ into the works! water being added is large. This is usually no big deal - unless the fish are affected. Some common warnings are when the fish stop eating right after a massive water change- or sulk on the bottom for a day. If so, have the water checked, reconsider your filter design, and do smaller, more frequent water changes rather than one massive one. A water change is the single best ally one can employ for the month to month stability of a pond. It is true that water changes in excess can disrupt an otherwise balanced system. The most common effect is water that becomes milky white or cloudy within hours of a massive water change. This is a disruption of the microbe balance and the ‘cloud’ is a massive explosion of heterotrophic bacteria species that take advantage of the imbalance. The same can happen, under different conditions, with single cell algae. This can be seen with NEW ponds that are still working out their microbial balance. Or it can be due to a bio-filter problem (size or design). Additionally, some water sources come loaded with minerals and compounds that naturally act as triggers for either bacterial or algal explosion. The temperature of the water and the pH of the water can also disrupt the balance if the difference between source water and pond water is extreme and the amount of source Remember, it is better to do smaller more frequent water changes than large infrequent ones. The smaller frequent change guarantees that the base line parameters never drift too far from optimal. The massive, infrequent change allows the baseline readings to drift far and then snaps them back into line in one fell swoop. Not too much an upset for strong fish like koi but maybe disruptive to the micro life and if they are too upset, this will ultimately ‘feed back’ on the koi themselves in some compounded effect. In closing, I’m sure the advanced koi keeper will agree with this statement: A water change is the single best ally one can employ for the month to month stability of a pond. Poor source water and excess water changes can certainly be an un-stabilizing force. But a closed system, left to its own dynamics, is the ultimate unraveling environment. 2 Protect your investment. Classic UV Sterilizer Over 30 years of innovation. 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