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How to Identify and Classify Danios
Contributed by: Wallis
  • 1. Which fin is NOT typically used for identifying Danio species?
A) Dorsal fin
B) Anal fin
C) Adipose fin
D) Caudal fin
  • 2. What body shape is most common among Danio species?
A) Eel-shaped
B) Torpedo-shaped
C) Globular
D) Disk-shaped
  • 3. What is the primary diet of most Danios in the wild?
A) Insects and invertebrates
B) Plant roots
C) Detritus
D) Algae
  • 4. What type of water parameters do Danios generally prefer?
A) Highly alkaline
B) Brackish
C) Slightly acidic to neutral
D) Very acidic
  • 5. Which Danio species is known for its bright horizontal stripes?
A) Pearl Danio (Danio albolineatus)
B) Zebra Danio (Danio rerio)
C) Glowlight Danio (Danio choprai)
D) Giant Danio (Devario aequipinnulus)
  • 6. The term 'Devario' refers to what?
A) A type of Danio food
B) A disease affecting Danios
C) A specific fin pattern
D) A related genus of larger Danios
  • 7. What is the typical size range for most Danio species?
A) 1-3 inches
B) 8-10 inches
C) 1 foot or more
D) 5-7 inches
  • 8. What behavior is common among Danio species?
A) Aggressive territoriality
B) Active schooling
C) Nocturnal hunting
D) Solitary bottom-dwelling
  • 9. Which feature is LEAST helpful in identifying a Danio?
A) Scale size
B) Fin ray count
C) Color pattern
D) Body shape
  • 10. What is the general region of origin for most Danio species?
A) Southeast Asia
B) Australia
C) Africa
D) South America
  • 11. Which Danio is known for its shimmering, iridescent scales?
A) Zebra Danio (Danio rerio)
B) Leopard Danio (Danio frankei)
C) Pearl Danio (Danio albolineatus)
D) Celestial Pearl Danio (Danio margaritatus)
  • 12. What does 'sexually dimorphic' mean?
A) Males and females have different appearances
B) They can change their sex
C) They only reproduce in groups
D) They reproduce asexually
  • 13. How do you typically tell male and female Danios apart?
A) Males have longer fins
B) Females have brighter colors
C) Females are usually rounder
D) Males are always larger
  • 14. Which of these is NOT a common color seen in Danios?
A) Blue
B) Gold
C) Silver
D) Purple
  • 15. The Celestial Pearl Danio (Danio margaritatus) is also known as:
A) Diamond Guppy
B) Emerald Tetra
C) Ruby Barb
D) Galaxy Rasbora
  • 16. What type of spawning behavior is typical for Danios?
A) Livebearers
B) Nest builders
C) Egg scatterers
D) Mouthbrooders
  • 17. What is a good tank size for a small school of Danios?
A) 50 gallons
B) 5 gallons
C) 10 gallons
D) 2 gallons
  • 18. What type of current do Danios prefer in their tank?
A) No current
B) Very strong current
C) Moderate current
D) Stagnant water
  • 19. Which Danio species can grow to be quite large, reaching up to 4 inches?
A) Zebra Danio (Danio rerio)
B) Spotted Danio (Danio nigrofasciatus)
C) Glowlight Danio (Danio choprai)
D) Giant Danio (Devario aequipinnulus)
  • 20. What is the scientific name for the Glowlight Danio?
A) Danio albolineatus
B) Danio rerio
C) Danio margaritatus
D) Danio choprai
  • 21. Which fin is the most important for propulsion in Danios?
A) Dorsal fin
B) Caudal fin
C) Pectoral fin
D) Anal fin
  • 22. What is a common symptom of illness in Danios?
A) Increased appetite
B) Clamped fins
C) Increased activity
D) Brighter colors
  • 23. What does the term 'shoaling' refer to?
A) Aggressively defending a territory
B) Hiding amongst plants
C) Swimming together in a loose group
D) Laying eggs
  • 24. Which of these is a common behavior exhibited by Danios?
A) Hunting larger fish
B) Burying themselves in the substrate
C) Building bubble nests
D) Playing in the filter current
  • 25. Which of these tankmates is NOT generally suitable for Danios?
A) Peaceful rasboras
B) Aggressive, fin-nipping species
C) Small tetras
D) Corydoras catfish
  • 26. What is a good indicator of water quality in a Danio tank?
A) Cloudy water
B) A strong fishy odor
C) Clear water and stable parameters
D) High ammonia levels
  • 27. How often should you perform water changes in a Danio tank?
A) Monthly
B) Weekly or bi-weekly
C) Every six months
D) Only when the water is visibly dirty
  • 28. What is the approximate lifespan of a well-cared for Danio?
A) 6-8 years
B) 1-2 years
C) 3-5 years
D) 10+ years
  • 29. What food form is best for Danios?
A) Live goldfish
B) Vegetable matter only
C) Small flakes or pellets
D) Large sinking pellets
  • 30. Which Danio species has vertical bars instead of horizontal stripes?
A) Zebra Danio (Danio rerio)
B) Pearl Danio (Danio albolineatus)
C) Giant Danio (Devario aequipinnulus)
D) Spotted Danio (Danio nigrofasciatus)
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