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How to Care for Koi Fishes
Contributed by: Sandhu
  • 1. What is the ideal pH range for a koi pond?
A) 3.0-4.0
B) 9.0-10.0
C) 5.0-6.5
D) 7.0-8.5
  • 2. How often should you perform a partial water change in a koi pond?
A) Monthly
B) Weekly or bi-weekly
C) Never
D) Annually
  • 3. What percentage of the water should be changed during a partial water change?
A) 100%
B) 10-20%
C) 75%
D) 50%
  • 4. What is a common sign of stress in koi?
A) Clamped fins
B) Active swimming
C) Aggressive feeding
D) Vibrant colors
  • 5. What is the best type of filtration for a koi pond?
A) No filtration needed
B) Just chemical
C) Combination of mechanical and biological
D) Just mechanical
  • 6. What temperature range is generally optimal for koi health?
A) 65-75°F (18-24°C)
B) 85-95°F (29-35°C)
C) 40-50°F (4-10°C)
D) 30-40°F (-1-4°C)
  • 7. What is a common parasite that affects koi?
A) Butterflies
B) Earthworms
C) Ladybugs
D) Ich
  • 8. How deep should a koi pond ideally be?
A) 2 feet
B) 1 foot
C) At least 3 feet
D) 6 inches
  • 9. What should you do before adding new koi to an existing pond?
A) Put in the freezer for 1 hour
B) Quarantine them
C) Skip the quarantine step
D) Add them immediately
  • 10. What is the best way to dechlorinate tap water before adding it to a koi pond?
A) Add bleach
B) Boil the water
C) Let it sit for a week
D) Use a dechlorinator
  • 11. What type of food is generally preferred for koi?
A) Dog food
B) Floating pellets
C) Cat food
D) Sinking pellets
  • 12. How often should you feed koi?
A) Never
B) Several times a day in small amounts
C) Once a week
D) Once a day in large amounts
  • 13. What is the purpose of a UV sterilizer in a koi pond?
A) Heat the water
B) Control algae and bacteria
C) Add carbon dioxide
D) Add oxygen
  • 14. What is the ideal stocking density for koi?
A) Unlimited fish per gallon
B) 1 inch of fish per 10 gallons of water
C) 10 inches of fish per 10 gallons of water
D) 1 inch of fish per gallon of water
  • 15. What is ammonia?
A) Koi Food
B) A beneficial element
C) A toxic byproduct of fish waste
D) Oxygen source
  • 16. What converts ammonia to nitrite?
A) Beneficial bacteria
B) Fish waste
C) Harmful algae
D) Chemicals
  • 17. What do plants in the pond absorb?
A) Ammonia
B) Nitrites
C) Phosphates
D) Nitrates
  • 18. What can you use to remove chlorine from the pond?
A) Dechlorinator
B) Bleach
C) Vinegar
D) Ammonia
  • 19. What should be done with uneaten food?
A) Removed immediately
B) Left to dissolve
C) Used as fertilizer
D) Stirred in
  • 20. What is a good depth for plants in a koi pond?
A) Floating only
B) Same as water level
C) As deep as possible
D) Varies by plant species
  • 21. When do koi typically spawn?
A) Winter
B) Autumn
C) Summer
D) Spring
  • 22. What should you do with sick koi?
A) Flush them
B) Ignore it
C) Quarantine and treat
D) Feed more
  • 23. What is an important mineral for koi health and color?
A) Sulfur
B) Calcium
C) Phosphorus
D) Iodine
  • 24. What should you do to prepare koi for winter?
A) Stop feeding entirely in the fall
B) Move them inside
C) Continue feeding normally
D) Reduce feeding as temperature drops
  • 25. What is the importance of aeration in a koi pond?
A) Provides oxygen
B) Increases ammonia
C) Removes oxygen
D) Reduces beneficial bacteria
  • 26. What is the best material for a koi pond liner?
A) Concrete
B) EPDM rubber
C) Plastic sheeting
D) Dirt
  • 27. How can you protect koi from predators like herons?
A) Loud music
B) Releasing other predators
C) Netting or decoys
D) Ignoring the problem
  • 28. What is the term for the white, red, and black koi?
A) Showa
B) Ogon
C) Kohaku
D) Asagi
  • 29. What is the role of a pond vacuum?
A) Add oxygen to the pond
B) Heat the water
C) Remove debris from the pond floor
D) Filter the water
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