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:
A
older ones
B
female crayfish that are laying eggs
C
young ones
10. Natural predators of crayfish are:
A
crocodiles, turtles and birds
B
only humans
C
they have no predators
11. The problem with farming marron is that:
A
they burrow and destroy dams
B
they are very sensitive to water quality changes
C
do not breed in the wild
12. The problem with farming yabbies is that:
A
they destroy dam walls by burrowing
B
they cannot breathe in fresh water
C
the females eat the males after mating
13. Aquarium water for red claw crayfish must be:
A
absolutely clean
B
dark and murky
C
salty
14. The water temperature for red claw crayfish must be:
A
very cold
B
nearly boiling
C
between 21 and 30 degrees
15. Young red claw crayfish can eat other crayfish. This is called:
A
herbivorous
B
cannibalistic
C
hatching
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