BEFORE READING
Find out where the Whanganui River is.
Write down what you know about kākahi
Kakahi are freshwater mussels.
DURING READING
Read page 2
Write down the 25 most important words in the tables
below
below
Kakahi
|
Worldwide
|
Freshwater mussels
|
Buttons
|
Plastic
|
Massively
|
Pollutants
|
Waterways
|
Reproduce
|
Research
|
Kaumatua
|
Disappeared
|
Algae
|
Bacteria
|
Siphon
|
Threatened
|
Animals
|
Reduced
|
Affected
|
Rare
|
Threatened
|
Remaining
|
Filter feeders
|
Whanganui
|
Stomach
|
Using these words summarise the main ideas from this page.
Kakahi or freshwater mussels
have reduced dramatically worldwide. People used to gather
Kakahi to use the shell for buttons before there was plastic
buttons. Some of the fish that help Kakahi in the
Whanganui River are now rare or threatened. Kakahi are
also affected by some pollutants. Water scientists have
researched about Kakahi. Kaumatua have addressed the problem
about Kakahi disappearing from the Whanganui River.
Hannah has gone and registered the river to look for any
remaining Kakahi.
Kakahi or freshwater mussels
have reduced dramatically worldwide. People used to gather
Kakahi to use the shell for buttons before there was plastic
buttons. Some of the fish that help Kakahi in the
Whanganui River are now rare or threatened. Kakahi are
also affected by some pollutants. Water scientists have
researched about Kakahi. Kaumatua have addressed the problem
about Kakahi disappearing from the Whanganui River.
Hannah has gone and registered the river to look for any
remaining Kakahi.
Read page 3
Explain why kākaki need fish to survive?
Kakahi need fish to survive because it helps replay the life
cycle. Female Kakahi release larvae named glochidia into the
water. Every glochidia must find a fish to latch onto
otherwise the baby Kakahi will die. If it finds the right fish
it will attach itself to the fish’s gills, mouth or fins and
parasites for a few weeks. During this period the
baby Kakahi will metamorphose (or develop) from larvae to
juvenile. It then leaves the fish and drops into the mud
at the bed of the river.
cycle. Female Kakahi release larvae named glochidia into the
water. Every glochidia must find a fish to latch onto
otherwise the baby Kakahi will die. If it finds the right fish
it will attach itself to the fish’s gills, mouth or fins and
parasites for a few weeks. During this period the
baby Kakahi will metamorphose (or develop) from larvae to
juvenile. It then leaves the fish and drops into the mud
at the bed of the river.
AFTER READING
Explain why you think there aren’t as many kākaki?
I think there isn’t there many Kakahi because people are
polluting the river and killing the fish. This is throws the
life cycle off and the ecosystem in the river has been
turned into a unhealthy ecosystem.
polluting the river and killing the fish. This is throws the
life cycle off and the ecosystem in the river has been
turned into a unhealthy ecosystem.
Do you have any more questions?
No
What else can you find out about kākahi? Are there any
in Northland? Did there used to be? (This isn't a
googlable question)
in Northland? Did there used to be? (This isn't a
googlable question)
You can tell the age of a Kakahi by counting the growth
rings on their shell. Same as you can the age of
tree.
DLO:
rings on their shell. Same as you can the age of
tree.
DLO:
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