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Crayfish Farming
1. Crayfish are not fish. They are:
A crustaceans
B insects
C arachnids
2. Nearly all crayfish live in:
A freshwater
B saltwater
C burrows in dry soil
3. Crayfish have a hard outer skeleton called an:
A endoskeleton
B exoskeleton
C inner skeleton
4. Crayfish have bodies which are in parts or:
A broken
B segmented
C missing
5. As crayfish grow, they grow a new skeleton and lose their old one. This process is called:
A moulting
B shedding
C skeleton removal
6. When crayfish grow a new skeleton, it is soft for a short time. At this time, they are:
A cold and immobile
B vulnerable to predators
C more active to keep warm
7. The body temperature of crayfish:
A is cold-blooded
B changes with the water temperature
C both of the above
8. Crayfish are most active at night. This behaviour is called:
A nocturnal
B diurnal
C juvenile
9. The type of crayfish that are more likely to be out on bright sunny days are the:
Aolder ones
Bfemale crayfish that are laying eggs
Cyoung ones
10. Natural predators of crayfish are:
Acrocodiles, turtles and birds
Bonly humans
Cthey have no predators
11. The problem with farming marron is that:
Athey burrow and destroy dams
Bthey are very sensitive to water quality changes
Cdo not breed in the wild
12. The problem with farming yabbies is that:
Athey destroy dam walls by burrowing
Bthey cannot breathe in fresh water
Cthe females eat the males after mating
13. Aquarium water for red claw crayfish must be:
Aabsolutely clean
Bdark and murky
Csalty
14. The water temperature for red claw crayfish must be:
Avery cold
Bnearly boiling
Cbetween 21 and 30 degrees
15. Young red claw crayfish can eat other crayfish. This is called:
Aherbivorous
Bcannibalistic
Chatching

 

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