The mesopelagic zone is also called the twilight zone. Though some sunlight 
penetrates through this zone there is not enough for photosynthesis
to occur and plants to grow. This zone,
which goes 
down about 3,300 feet, has some animals including octopus, squid,
and hatchet fish. The animals living in
this zone must survive cold temperatures, increased water pressure, and dark
water. Some fish have extra big eyes to
help them see, while others produce their own light called bioluminescence
using special organs in their bodies called photophores. Many animals in the twilight zone have thin
bodies as their camouflage so it is harder for predators to see them. But most fish don’t case their food they
either wait for it or stalk it. Some
have sharp fangs or big mouths to help them catch their food.