By: Mike Gannon | Posted On: January 24th, 2014 | 8 Comments on THE WEATHER LOACH, THIS DOJO GOT SOME MOJO! | In: KOI FISH, KOI PONDS, POND FISH, WATER GARDENS

weather dojo loach

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The Dojo got some mojo!

     The Dojo loach that is. Also known as the pond loach or oriental loach, but best known as the weather loach. The weather loach is an amazing fish that has had a relationship with mankind going back thousands of years; making it one of the oldest “domesticated” fish swimming this planet. The weather loach, or Misgurnus anguillicaudatus, has served mankind as a food fish, as an aquarium pet, and as a pond bottom feeder; but it is best known for its ability to predict weather!

     Who cares what the groundhog says, really who cares what the weatherman says; if you want some accu-weather forecasting then you need to tune into your weather loach for an up to the minute forecast. Keeping a weather loach in a glass container to predict weather is an age old practice, and a pretty accurate one too. It is commonly known and proven to be true that the weather loach senses changes in barometric pressure and will behave erratically with bursts of wild swimming activity before a storm hits. Or, even standing themselves straight up on end. When this behavior occurs you can break out the weather gear!

     The weather loach has an almost eel like, almost catfish like appearance but it is neither. It is a pleasant looking elongated scale-less fish, with a yellow brown to green grey coloration spattered with black spots or striping. There is even a golden variety. All variety of weather loach will max out at about 10”-12” in length.  It has strong and prominent pectoral fins, which is also a good way to tell male from female with the male pond loach bearing visibly larger pectoral fins than the female. Males tend to be more slender than females as well. Both male and female have sensitive barbells around their mouths. The 10 barbels in total, are used to forage for food by picking up on chemical trails; this loach does not forage for food by sight!

     Weather loaches are easy to care for, extremely durable fish living up to 10 years. They prefer cold freshwater, which make them great for keeping in our backyard ponds. They are friendly and social, not seeming to mind human contact. They prefer being kept in groups, which only adds to their fun almost comical personality. They can disappear for days on end by digging into the substrate and popping out just enough to watch their surroundings. In the wild they can survive out of water for extended periods of time by secreting a mucous coating around their bodies in time of drought. They accept a very wide range of foods and will forage in your pond or accept prepared foods just as readily. Cooked peas are a favorite treat of the weather loach, and your goldfish may join in that feast as well! Their adaptability makes them an excellent choice for backyard ponds, water gardens, and aquariums.dojo weather loach

     However; these guys are also found throughout the world in the wild, preferring habitats such as rivers, streams, lakes, even agricultural waterways like canals and ditches.  Misgurnus anguillicaudatus is native to Korea, Vietnam, Japan, Siberia, and China where they are a popular food item raised on massive farm operations. They have been introduced and thrive in areas like Europe, Eastern Europe, Australia, and North America. Some areas of the world consider them noxious and dangerous requiring citizens to report sightings of these fish to the authorities, and imposing heavy fines on persons possessing these fish. It can be found listed on the Global Invasive Species Database and is considered a bio-security threat in Southern Australia. In England you need a permit to keep the weather loach, and there are outright bans on them in some parts of the world. And yet other parts of the world they are listed as a species of least concern and no threat!

     The threats they do pose are generally regarding native fish and insect populations. Because they eat a wide variety of food and are constantly foraging the weather loach can have a serious impact as a result of its consumption of native fish eggs, native insect larvae and crustacean populations. Given that they also reproduce easily in the wild with a high survivor rate, they simply out compete native populations.

     Because they are so hardy they make for great additions to our backyard ponds and watergarden. They will socialize very well with koi and goldfish, even acclimating to accept their foods; so no special food is required. It’s diet within the pond will also be supplemented by foraging for bits of algae and aquatic “bugs”. Breeding in your backyard pond may not occur. However as part of the courtship the male will wrap himself around the female and wait until she releases her eggs so he can fertilize them. This courtship can take hours! The eggs are not cared for by either parent fish after they are fertilized, much like goldfish and koi. When choosing your weather loach, look carefully at the body of the fish. If you see redness or sores in the mouth area, around the gills, eyes, or fins do not accept the fish. If your selection seems “skinny” do not accept it. The skin should be smooth, and the fish should behave in a upbeat manner, not hiding or laying motionless.

     Once you have your weather loach home, acclimate it just like any other new addition to your pond. Never release weather loaches into local waterways if you do not keep it. Enjoy the interesting new addition to your pond. Keep a close eye on its behavior and pretty soon you will become the local weather authority by supplying your family and friends with “Dojo loach weather updates” from the pond!

All copy rights to this material is soley owned by Mike Gannon.

Written by Mike Gannon

Mike Gannon

The LOVEYOURPOND Blog is written by Mike Gannon of Full Service Aquatics located in Summit, NJ. Mike is an award winning pond, water garden, and water feature builder. Always “In The Pursuit Of All Things Aquatic” Mike has been a lifelong hobbyist and providing professional services since 1995. Mike is the creator of The Pond Hunter video series seen on Youtube and has made several television appearances on Networks such as HGTV and the DIY Network. He also hosts the Pond Hunter Radio Broadcast, a show on everything aquatic, every other Wednesday at 8pm EST. You can see what else Mike is up to at the following sites:


    Comments Feed
  1. Troy Says:

    on January 27, 2014 at 11:22 pm

    Oh yes. I looked up the golden variety and now I recognize where I have seen this before. My friend has one in his aquarium. It is indeed is a fun fish to watch.

  2. Mgannon Says:

    on January 28, 2014 at 9:20 pm

    Right Troy! especially in the aquarium the weather loach is a great for to watch! Never gets boring!

  3. Jennifer Z Says:

    on February 26, 2014 at 8:45 pm

    What a cool fish! Enjoyed reading this article and am flipping it into the Aquascape Lifestyles magazine!

  4. Mike Gannon Says:

    on February 26, 2014 at 11:54 pm

    Thanks for flipping this great fish information into the magazine!!

  5. bendover Says:

    on April 19, 2016 at 4:49 pm

    why do dojo loaches have whiskers mike?plz write back asap

  6. Mike Gannon Says:

    on April 23, 2016 at 11:54 am

    They have whiskers to help them find food and navigate in low visibility conditions, whiskers on other fish also have “taste buds” in them and that may be the case with the Dojo loach as well. -Mike

  7. Joey Says:

    on August 1, 2016 at 10:34 am

    Thanks for your information.
    I plan to cultivate such funny fish as hobby and business, does anybody know how to get fingerlings of Dojo loach? Please contact me through my email address of Thank you!

  8. Joey Says:

    on August 1, 2016 at 10:36 am

    I own small farm and I am starting aquaponics in greenhouse. I can cultivate both in the greenhouse and outside pond. The most important is how to find the fingerlings in USA.

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