Koi Pond Maintenance and Protection Guide during the Rainy Season | The Veteran Driver's Handbook of Dampness and Disease Prevention

       The rainy season, which is a poetic reflection of the smoky rain of the south of the Yangtze River, is a "battle for survival" for koi players. When the acid rain erosion of water quality, when the dissolved oxygen fell below the critical value, when the value of ten thousand yuan danding tricolor due to water mold disease faded - the traditional conservation of powerlessness, is forcing the industry to innovate.

       We spent 3 years in 23 large-scale fish farms in the Yangtze River Delta to decode the 6 major culprits of the plummeting survival rate in the rainy season.::

• The pH "roller coaster" triggered by rainwater backups
• "Collective dormancy" of nitrification systems under low temperature and high humidity conditions
• "Invisible evaporation" of dissolved oxygen due to a sudden drop in barometric pressure
• "Invasion corridors" created by parasites through rainwater.
• Algae toxin "biochemical attack" on rainy days
• Fish immunity suffers a "precipitous drop".

I. Three axes for water quality stabilization (low-cost, high-return operations)‌

1. ‌Dissolved Oxygen First Aid Kit‌

   • ‌Oxygenator Rain Cover DIY: Use discarded plastic buckets (e.g., cooking oil drums) with holes punched in the bottom and inverted over the aerator to protect against rain and not block airflow (cost $0).
   • ‌Late Night Oxygen Trap: 22:00-6:00 open the air pump, the lowest air pressure at this time, each ton of water oxygenation needs to be up to 5mg / L (Detector: Portable Dissolved Oxygen Meter, a treasure ¥ 80 can be measured).

2. ‌pH Savior‌

   • ‌Coral Stone First Aid Kit: Old stockings filled with coral stone (200g per ton of water), hanging filtration bin outlet, acid rain storms can carry the pH drop of 0.5 (measured data).
   • ‌Baking Soda Fine Tuning: Sprinkle edible baking soda (supermarket ￥5/bag) every day, add 5g per ton of water each time, pH fluctuation control within ± 0.2.

1. ‌toxin scavenger‌

   • ‌guerrilla warfare with activated carbon: Before the rainstorm in the overflow tank paved 2cm thick coconut shell activated carbon (a lot of ¥ 10/catty), 48 hours adsorption rate of more than 60%.
   • ‌Nitrifying bacteria renewal method: Add low-temperature-resistant nitrifying bacteria (recommended brand: BIOMAX 1) every week, with a dosage of 30% more than the instructions (the activity of the bacterial colony drops by 40% during the rainy season).

‌Second, koi anti-disease three-piece set (veteran private secret skills)‌

1. ‌Enteritis Firewall‌

   • ‌Allicin Concoctions: Crush fresh garlic and soak in white wine at 1:10, spray 20ml per kg of feed (cost 70% less than finished allicin).
   • ‌Fermented feed ready to use: EM bacteria + wheat bran + water (ratio 1:3:5) sealed fermentation for 24 hours, rainy day replacement for 30% staple food.

2. ‌Natural Enemy Network of Parasites‌

   • ‌salinity warning line: Prepare a basin of pool water + salinometer (some treasure ¥ 25), salinity < 0.3% immediately sprinkle coarse salt (add 3kg per ton of water).
   • ‌Physical Interceptor: Old screen window cloth (80 mesh) tied to the outlet, intercepting cyclops with an efficiency of up to 901 TP3T.

3. ‌Golden Bell Mask on the body surface (idiom); fig. a complete lack of control over one's body‌

   • ‌Beta-Glucan Money Saving TipsGanoderma lucidum wall-broken spore powder (pharmacy ￥50/bottle) for human use is added at 0.1g/kg of feed, and the effect is equal to that of aquatic special agent.

‌Third, the environmental defense tart operation (a look at the dirt method)‌

1. ‌Rainwater Isolation Tips‌

   • ‌DIY Drainage Channel: Pool side digging 10cm deep ditch, buried PVC pipe (diameter 5cm) diversion to the vegetable field, both to prevent backflow and watering vegetables.
   • ‌Oil slick collector: Mineral water bottle cut in half upside down, bottle mouth tied filter cotton, floating water surface automatic oil absorption film (measured 3 hours to suck full).

2. ‌algal balancing act‌

   • ‌diatom directed culture: Hang white reflective boards on the east side of the fish pond (used KT boards will do) to promote diatom blooms and inhibit cyanobacteria.
   • ‌Sunshade Metaphysics: Cover the 30% shade rate black net at 10 a.m. and uncover it at 2 p.m. to control algae without delaying the fish's sun exposure.

3. ‌Biological Early Warning System‌

   • ‌Medaka Sentinel: 5 mosquito-eating fish were put in the pool and floated their heads 6 hours before the koi, which is called a living oxygen dissolution alarm.

‌IV. First aid guide for emergencies (life-saving at critical moments)‌

1. ‌Three-minute first aid after a rainstorm‌

   • ‌Oxygenation of floating head of fish: Sodium percarbonate (a lot of ¥ 15 / kg) by 5g / ton of water directly sprinkled, 20 seconds bubbling for oxygen.
   • ‌Stress KillerVitamin C tablets (drugstore ¥ 8 / bottle) crushed according to 2g / ton of water sprinkler, stabilize the fish quickly.

2. ‌Water mold three-day annihilation war‌

   • ‌first dayMethylene blue (some treasure ￥20/bottle) to water to light blue color whole pool sprinkling
   • ‌the morrow: Sprinkle salt to 0.51 TP3T concentration after 1/3 water change
   • ‌third dayBoiled ginger water (500g of old ginger/ton of water) to enhance fish resistance

‌V. Koi and rainy season anecdotes (Happy moments for fish farmers)‌

1. ‌"Weather Forecaster" Koi‌

   • Before the air pressure plummets, the giant carp in the pool will frantically bump against the feeder to demand bait, and veterans see this behavior and immediately start the oxygenator.

2. ‌"Prison Break Masters" and the scene of the car crash.‌

   • A fish friend's pool 85cm red and white due to heavy rainfall water level rose, jumped over the 30cm baffle jumped into the next door vegetable field, found the next day is in the puddle of water calmly swing tail.

3. ‌The "Mindful Fish" Grabbing Technique‌

   • Smart koi will deliberately create a bait float by slapping the surface of the water with their tail fins, luring other fish to gather and then suddenly swooping down to clear the plate.

‌Final Reminder‌
Operational mnemonic for the rainy season:
"Oxygen should be sufficient, salt should be salty, and feeding should rather be less than more;
Check the gills diligently, watch the poop more often, and keep the rain and algae out is most critical"