A Wonderleaf question
Do fish get thirsty?
a real page from the book
Some fish do get thirsty in a fishy sort of way, and some do not. Saltwater fish lose body water to the salty sea, so they drink seawater and remove the extra salt; freshwater fish gain too much water and usually avoid drinking.
The funny part is that the same basic body problem flips when the water changes. A tuna has to keep replacing water, while a goldfish is busy getting rid of it, all because water moves toward saltier places through thin body surfaces.
Wonder words
- osmosis
- gills
- seawater
- freshwater
Try it out
At dinner, dissolve salt in one glass of water and leave another plain, then talk about which home would suit each fish.
Read the whole picture book
Watercolour scenes, straight answers, about three minutes cover to cover.
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