That really depends on the type of fish and
where in the ocean it is living. For many fish,
the biggest challenge is trying not to be eaten
by other animals in the ocean. Fish that are
small prey face the constant challenge of survival
every day and many will meet their end in the
stomach of a larger fish or mammal. Though like
humans, fish can also get many diseases and
parasites that can wipe out large numbers of
fish at once. This is more of a problem for fish
grown commercially than fish in the wild. Finally,
one of the greatest challenges that fish face is
human interference. Human activities can
pollute the water and raise its temperature which
lowers the ability of fish to survive. Also,
fishing for a particular fish irresponsibly can
lead to a particular species decreasing in number.
All kinds of fish face different challenges,
and each are adapted to these challenges uniquely.
If I had to choose one particular challenge, I
would say breeding. Many salt water fish
have to swim very far upstream, even into fresh
water, to lay eggs. Millions of fish die doing
this every year, but still they spawn.
I think another cool challenge is how arctic
fish adapt to cold. The water in the arctic
regions is very cold, but fish still live there.
They adapt their cells at a molecule scale by
removing cholesterol molecules from their cell
membranes, making the membrane more fluid, so it
doesn't freeze as easily at cold temperatures.
This is pretty cool.
Click Here to return to the search form.