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How to Identify and Classify Guppies
Contributed by: Wallis
  • 1. What is the scientific name for the common guppy?
A) Poecilia reticulata
B) Carassius auratus
C) Paracheirodon innesi
D) Betta splendens
  • 2. Guppies are native to which continent?
A) Europe
B) Africa
C) Asia
D) South America
  • 3. What is the most reliable way to differentiate male and female guppies?
A) Size of the body
B) Shape of the dorsal fin
C) Coloration of the tail
D) Presence of a gonopodium in males
  • 4. What is a gonopodium?
A) A sensory organ for detecting prey
B) A defensive spine for protection
C) A modified anal fin used for reproduction
D) A specialized gill for oxygen absorption
  • 5. Which sex is generally more colorful in guppies?
A) Depends on the breed
B) Both are equally colorful
C) Males
D) Females
  • 6. What is the average lifespan of a guppy in captivity?
A) 8-10 years
B) Less than 6 months
C) 1-3 years
D) 5-7 years
  • 7. Guppies are ovoviviparous, meaning what?
A) They lay eggs
B) They reproduce asexually
C) They require a host to reproduce
D) They give birth to live young
  • 8. What is the gestation period for guppies?
A) Approximately 90 days
B) Approximately 30 days
C) Approximately 60 days
D) Approximately 15 days
  • 9. What is a 'fancy' guppy primarily defined by?
A) Unusual fin placement
B) Larger body size
C) Higher disease resistance
D) Elaborate tail shapes and colors
  • 10. Which tail shape is NOT a recognized guppy tail type?
A) Round tail
B) Delta tail
C) Lyretail
D) Square tail
  • 11. What is a 'cobra' guppy known for?
A) A flattened body shape
B) Rosette-like patterns on its body
C) A long, flowing tail
D) Bright red coloration
  • 12. What is the term for the metallic sheen sometimes seen on guppies?
A) Iridescence
B) Albinism
C) Xanthism
D) Melanism
  • 13. What does 'mosaic' refer to in guppy classification?
A) A single, solid color
B) Scale-like patterns
C) A completely transparent body
D) Irregular patterns of colors on the fins and body
  • 14. What is a 'snake skin' guppy characterized by?
A) Bright yellow and black stripes
B) A scale-less body
C) Chain-like pattern on the body
D) A rough, textured skin
  • 15. What is a common cause of fin rot in guppies?
A) Poor water quality
B) Overfeeding
C) Lack of sunlight
D) High water temperature
  • 16. What is the ideal water temperature for guppies?
A) 50-55°F (10-13°C)
B) 60-65°F (15-18°C)
C) 85-90°F (29-32°C)
D) 72-78°F (22-26°C)
  • 17. What pH level is generally best for guppies?
A) 5.0-6.0
B) 8.5-9.5
C) 6.8-7.8
D) 3.0-4.0
  • 18. Why is it important to quarantine new guppies?
A) To observe their behavior in isolation
B) To encourage breeding
C) To acclimate them to the new tank faster
D) To prevent the spread of diseases
  • 19. What does the term 'strain' typically refer to in guppy breeding?
A) A line of guppies bred for specific traits
B) A type of aquarium plant
C) A method of water filtration
D) A type of guppy food
  • 20. What is inbreeding in guppies likely to cause?
A) Higher fertility rates
B) Increased size and vibrant colors
C) Genetic defects and weakened immune systems
D) Longer lifespans
  • 21. What type of food are guppies considered?
A) Omnivores
B) Insectivores
C) Herbivores
D) Carnivores
  • 22. What does 'dorsal fin' refer to?
A) The fin on the belly of the fish
B) The fin on the back of the fish
C) The fin used for steering
D) The tail fin
  • 23. Which of these is a sign of a healthy guppy?
A) Active swimming
B) Lethargy
C) Clamped fins
D) Rapid gill movement
  • 24. What is 'Ich' in guppies?
A) A bacterial infection causing fin rot
B) A viral disease causing popeye
C) A parasitic disease causing white spots
D) A fungal infection causing cotton-like growth
  • 25. What does 'bioload' refer to in an aquarium?
A) The weight of the rocks and substrate
B) The type of filter used
C) The amount of waste produced by the inhabitants
D) The amount of light needed for plants
  • 26. What is the purpose of cycling a new aquarium?
A) To remove excess chlorine
B) To adjust the water temperature
C) To add nutrients for plants
D) To establish beneficial bacteria
  • 27. Why should you avoid overstocking a guppy tank?
A) It prevents the guppies from swimming
B) It makes the tank look crowded
C) It leads to poor water quality
D) It encourages breeding
  • 28. What is the purpose of a water change?
A) To add more chlorine to the water
B) To increase the water temperature
C) To remove nitrates and replenish minerals
D) To add more beneficial bacteria
  • 29. What is the 'endler'?
A) A guppy disease
B) A guppy fin type
C) A type of guppy food
D) A closely related species of guppy
  • 30. What does the term 'cull' mean in guppy breeding?
A) To change the water in the breeding tank
B) To add new fish to the breeding line
C) To remove undesirable fish from the breeding line
D) To feed the guppies a special diet
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