Weather Loach

Weather Loaches are captivating freshwater fish, bearing a close relation to the family of Cobitidae. Sporting a unique eel-like appearance, they have garnered affection from aquarium aficionados. Their docile demeanor and low upkeep needs make them a splendid pick for community aquariums.

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Care DIfficulty


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East Asia

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10 inches (25 cm)

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10 years

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Table of contents

Origin, Appearance, Size, and Lifespan

The Weather Loach, or Misgurnus anguillicaudatus, sometimes called the Dojo Loach, is a cherished freshwater fish that originates from East Asia, more specifically, from regions in China, Korea, and Japan. They are typically found inhabiting slow-moving and stagnant waters like paddy fields, ponds, and ditches.

In the wild, Weather Loaches prefer peaceful, shallow waters with an abundance of vegetation. The plants provide both a source of nourishment and shelter, while the murky waterbed enhances their distinctive coloration. These sociable creatures enjoy being in clusters of at least five, and it's common to spot them in groups of even larger numbers.

Their natural environment comprises cool, slightly alkaline water. The temperature usually fluctuates between 50 to 77 degrees Fahrenheit (10 to 25 degrees Celsius), with a pH level of 6.0 to 8.0, and water hardness ranging from 5 to 12 dGH. To replicate this environment in your aquarium, ensure a steady water temperature, utilize an excellent filtration system, and include live plants and hiding spots.

By meticulously recreating the Weather Loach's natural habitat and maintaining ideal water conditions, you set the stage for your fish to lead a fulfilling life in your aquarium.

Weather Loaches are renowned for their elongated, eel-like bodies, primarily gray or olive-brown, with a lighter, creamy underside. Their intriguing morphology, coupled with their burrowing habits, makes them an engaging addition to any aquarium. Even though they are considerably larger, growing up to around 10 inches (25 cm) in length, their unique behavior and striking appearance make them an ideal choice for those desiring a lively, intriguing aquatic display. These fascinating fish bring a sense of tranquility to viewers as they gracefully meander through the tank, endearing them to hobbyists across all skill levels.

With appropriate care, Weather Loaches can lead a long life of up to 10 years. Given their social nature, they thrive in groups and are best kept in clusters of at least five individuals. To enhance their well-being and ensure longevity in captivity, it's crucial to provide a well-planted aquarium with numerous hiding spots, as well as a varied diet of quality flakes, pellets, and occasional live or frozen foods.

Fun Facts

Having explored the appearance and lifespan of Weather Loaches, let's delve into this section spotlighting some intriguing facts about these unique fish that make them distinct in the world of aquariums. With their special morphology and engaging behaviors, Weather Loaches are full of charm and are sure to captivate any aquarist.

  • Barometric pressure sensitivity: One unique characteristic of Weather Loaches is their sensitivity to changes in barometric pressure. They earned their common name due to their tendency to become particularly active before a change in weather. This behavior is related to the dropping air pressure that often precedes a storm or weather change.
  • Survival out of water: Interestingly, Weather Loaches possess the ability to breathe air. This survival mechanism helps them to endure in oxygen-deprived environments and during periods of drought in the wild. If their habitat dries up, they can survive out of water for some time, provided they stay moist.
  • Nocturnal nature: Unlike many popular aquarium fish, Weather Loaches are nocturnal, meaning they are most active during the night. They spend their day burrowed in the substrate and become more active after the lights go out, making them a fascinating addition to any aquarium.
  • Color variation: Weather Loaches are capable of adjusting their coloration slightly to better blend with their environment. While not as vibrant as some other aquarium species, this subtle color change makes them interesting to observe.
  • Burrowing behavior: Weather Loaches are known for their burrowing behavior. They like to dig and bury themselves in the substrate, often with only their head or tail sticking out. This behavior is not only fun to watch but also serves as a sign that your loach feels comfortable in its environment.

Now that you've learned some fascinating aspects about Weather Loaches, you'll be better positioned to appreciate their unique attributes in your aquarium. In the next section, we'll offer advice on tank setups, ensuring your Weather Loaches have an ideal environment to thrive and exhibit their remarkable behaviors.

Recommended Tank Setups

This section includes comprehensive tank setups that allow you to create a suitable environment for Weather Loaches and other compatible freshwater fish species in your aquarium. These setups range from budget-conscious to more high-end options, allowing for more customization, aesthetics, and advanced features. Weather Loaches prefer to live in groups, and it's recommended to house at least two individuals together. The average cost of a Weather Loach can range between $3 and $6 per fish, although prices can vary based on factors such as size, quality, and availability.

Budget-friendly setup (around $200):

  • Tank: 20-gallon long aquarium with a hood or glass canopy ($40 - $70)
  • Filter: Hang-on-back (HOB) or sponge filter rated for 20 gallons ($20 - $40)
  • Heater: 50-100 watt adjustable aquarium heater ($15 - $30)
  • Lighting: Basic LED aquarium light ($20 - $50)
  • Substrate: Inexpensive aquarium sand ($10 - $20)
  • Decor: A few pieces of driftwood and smooth rocks for hiding, along with hardy live plants like Java Fern and Anubias ($20 - $40)
  • Fish: At least two Weather Loaches ($6 - $12)
  • Thermometer: $3 - $10
  • Substrate Vacuum: $10 - $25
  • Fish Net: $2 - $10
  • Algae Scraper or Magnetic Cleaner: $5 - $20
  • Siphon and Bucket: $15 - $30
  • Test Kit: $15 - $50
  • Fish Food: $5 - $20
  • Water Conditioner: $5 - $15

Mid-range setup (around $400 - $650):

  • Tank: 30-40 gallon aquarium with a hood or glass canopy ($60 - $120)
  • Filter: Canister filter or high-quality HOB filter rated for the tank size ($60 - $150)
  • Heater: 100-150 watt adjustable aquarium heater ($25 - $50)
  • Lighting: LED aquarium light with adjustable settings ($50 - $150)
  • Substrate: Natural river sand or fine gravel ($20 - $40)
  • Decor: A mix of driftwood, smooth rocks, and live plants such as Amazon Swords, Java Fern, Anubias, and Cryptocoryne species ($40 - $80)
  • Fish: At least two Weather Loaches ($6 - $12)
  • Thermometer: $3 - $10
  • Substrate Vacuum: $10 - $25
  • Fish Net: $2 - $10
  • Algae Scraper or Magnetic Cleaner: $5 - $20
  • Siphon and Bucket: $15 - $30
  • Test Kit: $15 - $50
  • Fish Food: $5 - $20
  • Water Conditioner: $5 - $15

High-end setup (above $800):

  • Tank: 55-75 gallon rimless aquarium with a glass canopy ($120 - $250)
  • Filter: High-quality canister filter rated for the tank size ($100 - $250)
  • Heater: 150-200 watt adjustable aquarium heater with an external temperature controller ($40 - $80)
  • Lighting: Advanced LED lighting system with customizable settings ($150 - $300)
  • Substrate: Premium natural river sand or fine gravel ($30 - $60)
  • Decor: A diverse selection of driftwood, smooth rocks, and live plants to create a natural river bed environment, featuring plant species such as Amazon Swords, Java Fern, Anubias, Cryptocoryne species, and carpeting plants like Dwarf Hairgrass or Monte Carlo ($60 - $150)
  • Fish: At least three Weather Loaches ($9 - $18)
  • Thermometer: $3 - $10
  • Substrate Vacuum: $10 - $25
  • Fish Net: $2 - $10
  • Algae Scraper or Magnetic Cleaner: $5 - $20
  • Siphon and Bucket: $15 - $30
  • Test Kit: $15 - $50
  • Fish Food: $5 - $20
  • Water Conditioner: $5 - $15

It's important to note that these are just suggestions. The number of Weather Loaches you choose to keep in your aquarium can depend on other factors such as the presence of other fish species and the unique behaviors of individual loaches. Prices may vary depending on location, brand, and availability.

Set Up Your Tank

In the earlier discussion, we elaborated on the ideal tank setups specifically for your Weather Loaches. To make the process more tangible, let's break down the step-by-step process of setting up your aquarium. This guide will aid you in choosing a suitable location for your tank, cleaning and preparing it, installing vital equipment, and cycling the water to foster a healthy environment for your loaches. We'll also touch on the correct acclimation process to ensure a seamless transition for your Weather Loaches into their new habitat. Adhering to these guidelines will set you on the path to establishing a thriving aquatic ecosystem for your loaches to thrive in.

  • Step #1: Identify an optimal location for your aquarium, ensuring it is distanced from direct sunlight, heat sources, and air drafts. Make sure the surface is both level and robust enough to bear the weight of your filled tank. If your tank necessitates a stand, assemble it following the manufacturer's guidelines and position the empty tank on top.
  • Step #2: Proceed to clean the tank by rinsing it with fresh water (refrain from using soap or chemicals) to rid it of dust or foreign particles. Clean the inside with a fresh cloth or paper towel. Thoroughly rinse the substrate (sand or gravel) in a bucket until the runoff is clear, then distribute it uniformly over the bottom of the tank, crafting a subtle slope towards the back for a depth illusion.
  • Step #3: Prior to filling the tank with water, draft the design of your aquarium, including the arrangement of equipment like heaters and filters. This upfront planning will simplify the setup and maintenance of the tank in the future. Install the heater and filter as per the manufacturer's guidelines. If you're opting for a sponge or under-gravel filter, place it under the substrate before pouring in water.
  • Step #4: Adorn the tank with driftwood, rocks, and plants to create hideouts and an aesthetically pleasing environment while maintaining ample swimming space for your loaches. Be cautious in your arrangement of driftwood, rocks, and plants to avoid harming or blocking the equipment. Consider anchoring plants to driftwood or rocks for stability.
  • Step #5: Add water treated with a water conditioner to the tank, if your tap water has chlorine or chloramines. To avoid disturbing the substrate while filling, place a clean plate or plastic bag on top of it. Fill the tank until it's about 2/3 full. Attach the aquarium light to the hood or canopy, in accordance with the manufacturer's guidelines. Consider setting a timer for your aquarium light to uphold a consistent day and night cycle, crucial for the well-being of both fish and plants. Plug in the heater, filter, and any additional equipment (air pump, CO2 system) to their power sources, and position the thermometer in a spot that is easy to see.
  • Step #6: Top up the water, leaving some gap between the water surface and the tank top for oxygen exchange. Activate the filter, heater, and other devices. Monitor the water temperature and regulate the heater if necessary. Allow the tank to cycle for 4-6 weeks to cultivate beneficial bacteria and stabilize water parameters. During this cycling period, consider adding a bacterial starter culture to expedite the establishment of beneficial bacteria in the tank. Use an aquarium test kit to keep track of ammonia, nitrite, and nitrate levels.
  • Step #7: Once the tank has cycled and the water parameters are stable, slowly acclimate your Weather Loaches to the tank's conditions before releasing them. Start by floating the unopened fish bag in the tank for about 15-20 minutes to match the temperatures. Then, open the bag and gradually add a small quantity of tank water to it. Continue this process, adding small amounts of tank water to the bag every 5-10 minutes for at least 30-60 minutes. This method allows your loaches to adjust to the new water chemistry slowly. Use a net to gently move the loaches from the bag to the tank, taking care to avoid causing unnecessary stress or exposing them to the water from the bag.
  • Step #8: After all the loaches are introduced, set up a consistent feeding routine, offering high-quality food in quantities suitable for your loach species. Carry out regular water changes (20-30% every 1-2 weeks) and routinely monitor water parameters using a test kit to maintain a healthy environment for your loaches. Closely observe your loaches for any indications of stress or illness, especially during the initial few weeks after introduction. Be ready to take action if needed, such as adjusting water parameters or seeking counsel from an experienced aquarist.

By following this comprehensive guide and incorporating the additional setup tips, you'll be able to create a flourishing aquatic environment conducive to the health and happiness of your Weather Loaches in their new home.

Recommended Water Parameters

Caring for Weather Loaches involves managing specific water parameters in your aquarium. Here's what you should strive for:

  • Temperature: Weather Loaches enjoy cooler water. Keep the water between 50°F and 77°F (10°C and 25°C) for their optimal comfort.
  • pH: A neutral to slightly alkaline pH of 6.0 to 8.0 is ideal, but they can adapt if changes are gradual.
  • Hardness: Moderately hard to hard water (5-15 dGH) suits them best, though they can tolerate softer water.
  • Ammonia, Nitrite, and Nitrate: Maintain ammonia and nitrite levels at 0 ppm, and keep nitrate levels below 20 ppm.
  • Lighting: Moderate lighting is suitable as they are bottom dwellers and prefer hiding spots.
  • Water movement: These loaches love a robust water flow, mimicking their natural fast-flowing habitat.It's crucial to routinely check your aquarium water and conduct necessary water changes to maintain a steady environment.

Routine Water Maintenance

Water changes are essential for a healthy Weather Loach habitat. They assist in eliminating excess nutrients, waste, and toxins. Here's a recommended routine:

  • Weekly water changes: Substitute 20-25% of the tank water each week.
  • Test water parameters: Regularly measure pH, ammonia, nitrite, nitrate, and hardness levels.
  • Use a gravel vacuum: Clean the substrate during water changes to maintain cleanliness.
  • Dechlorinate the water: Prior to adding it to the aquarium, treat tap water with a water conditioner.
  • Match temperature and pH: Ensure the new water closely matches the existing tank water.
  • Acclimate the fish: Allow your fish time to adjust to the new conditions after water changes.

Besides routine water maintenance, consider the following for your fish's health and the overall appeal of your aquarium:

  • Monitor lighting duration: Ensure a consistent 8-10 hour photoperiod, avoiding too much light which can lead to excessive algae growth.
  • Plant maintenance: Frequently trim live plants for their health and appearance. Discard any dead leaves or plant matter to avoid water quality issues.
  • Filter maintenance: Clean or replace the filter media every 4-6 weeks, as suggested by the manufacturer, to avoid disturbing the beneficial bacteria and leading to water quality issues.‍

Diet and Feeding Schedule

Weather Loaches are omnivorous bottom feeders, requiring a diverse diet. Here are some feeding recommendations:

  • Sinking pellets: Use high-quality sinking pellets suitable for bottom dwellers.
  • Frozen and live foods: Incorporate treats like bloodworms, brine shrimp, or daphnia into their diet.
  • Vegetable matter: Add blanched zucchini, peas, or spinach for supplementary nutrients.
  • Feeding frequency: Provide moderate portions once or twice a day, taking care not to overfeed.

Stress and Diseases

Weather Loaches may experience stress due to various sources such as improper water quality, unsuitable tank conditions, or aggression. Recognizing and addressing these stressors is crucial for your fish's well-being:

  • Watch for stress signs: Monitor your Weather Loaches for unusual behavior like hiding, lethargy, color loss, or rapid breathing, which may suggest stress.
  • Check water quality: Test your aquarium water to ensure it meets ideal parameters and regularly change the water to uphold a healthy environment.
  • Monitor tank mates: Make sure your Weather Loaches aren't being harassed or attacked by other fish and remove any aggressive tank mates if necessary.
  • Create a suitable habitat: Provide plenty of hiding spots, appropriate lighting, and a suitably sized tank for your fish.

Even though Weather Loaches are fairly robust, they can be susceptible to some common fish diseases, such as:

  • Ich (white spot disease): This common parasitic infection results in white spots on the body and fins, lethargy, and loss of appetite. Treat Ich with aquarium salt or anti-parasitic medication and raise the water temperature slightly.
  • Fin rot: This bacterial infection leads to frayed or discolored fins and tail. Treat fin rot with a partial water change, aquarium salt, and antibacterial medication.
  • Skin flukes: These parasites cause irritation, and you might notice your loach rubbing its body on objects. Skin flukes can be treated with anti-parasitic medication.
  • Bacterial infections: Symptoms may include redness, ulcers, or pop-eye. These can be treated with antibiotics designed for fish.

Preventing diseases in Weather Loaches involves maintaining excellent water quality, refraining from overfeeding, and providing a balanced diet. Quarantine new fish before adding them to the main tank and address any signs of illness promptly.


Breeding Weather Loaches can be a bit challenging due to their specific requirements, but it's possible with the right setup and conditions. Follow these steps to breed Weather Loaches:

  • Step #1: Prepare a suitable breeding environment with a separate tank of at least 20 gallons, a pH level around 7.0, and a temperature of about 77°F (25°C). They prefer a fast water flow, so consider using a powerhead to replicate their natural environment. Also, provide plenty of hiding spots.
  • Step #2: Choose healthy, mature male and female Weather Loaches for breeding. Gender identification can be difficult, but males are generally smaller and slimmer than females.
  • Step #3: Feed the breeding pair a high-protein diet of live or frozen foods to enhance their energy and strength.
  • Step #4: Weather Loaches typically breed during rainy seasons, so replicating these conditions might trigger spawning. Gradually decrease the water temperature, and increase the water flow.
  • Step #5: After spawning, remove the parents as they might eat the eggs. Eggs will hatch within 3-7 days, and the fry can be fed infusoria or finely crushed flake food.
  • Step #6: Monitor the growth and development of the fry, and provide a well-filtered, secure environment.

Breeding Weather Loaches can be a rewarding experience for seasoned aquarists. Patience and the right conditions are the keys to success.

Recommended Tank Mates

Here are the top 10 recommended tank mates for Weather Loaches:

  1. Zebra Danios
  2. Harlequin Rasboras
  3. Platies
  4. Mollies
  5. Swordtails
  6. Angelfish
  7. Corydoras Catfish
  8. Cherry Barb
  9. Tiger Barb
  10. Ghost Shrimp

Avoid keeping Weather Loaches with aggressive or overly territorial species like Cichlids or larger predatory fish, as they can cause harm to the loaches. It's essential to monitor the behavior of new fish and ensure they are not causing any stress or hostility towards the Weather Loaches.


In summary, Weather Loaches are unique and entertaining species of freshwater fish known for their vibrant behavior and adaptable nature. These fish need specific water conditions, a diverse diet, and a comfortable environment to prosper in captivity. When provided with these, they can live up to 10 years, making them a fascinating addition to any aquarium. When choosing tank mates, selecting peaceful and non-aggressive species is essential to maintaining a serene community. Breeding Weather Loaches can be complex but rewarding, requiring patience, experience, and the right environment. All in all, Weather Loaches are intriguing and lively creatures that can bring a sense of excitement and character to any aquarium setup.

Frequently Asked Questions

What is the ideal tank size for Weather Loaches?

For Weather Loaches, a 55-gallon tank is the minimum suggested size for one or two individuals. Larger tanks are always better, as they provide more swimming space and help maintain stable water conditions.

How many Weather Loaches should be kept together?

While Weather Loaches can be kept singly, they're social creatures and tend to be happier and more active in groups of at least three.

What water parameters do Weather Loaches require?

Weather Loaches thrive in water temperatures between 50°F and 77°F (10°C and 25°C), a pH between 6.0 and 8.0, and moderate to hard water with a hardness between 5 and 12 dGH.

What do Weather Loaches eat?

Weather Loaches are omnivorous and need a diverse diet. Feed them a combination of quality sinking pellet or flake food, along with live or frozen foods such as brine shrimp, earthworms, and bloodworms.

Are Weather Loaches compatible with other fish?

Yes, Weather Loaches are generally peaceful and can coexist with other similarly sized, non-aggressive fish species. Ideal tank mates include Zebra Danios, Harlequin Rasboras, and Corydoras Catfish.

How long do Weather Loaches live?

With proper care and ideal tank conditions, Weather Loaches can live for up to 10 years.

How do I breed Weather Loaches?

Breeding Weather Loaches can be complex, as they require specific conditions like a swift water flow and a larger tank. They typically breed during the rainy season, and these conditions should be replicated in the aquarium. Separate breeding tanks are recommended.

Do Weather Loaches require a planted tank?

While not a strict requirement, a planted tank can greatly benefit Weather Loaches. Live plants offer hiding places, enhance water quality, and mimic a more natural environment similar to their native habitat.

Can Weather Loaches change color?

Yes, Weather Loaches can change color in response to various factors, such as stress, sickness, or changes in water parameters. If you notice your Weather Loaches showing color loss, it's crucial to check the water conditions and monitor their health closely.