Tropical reefs are like cities DIVERSITY IS ALL AROUND Tropical fishes swim in water as warm as a swimming pool Exquisite butterflyfish
Masked butterflyfish Their home on a coral reef could be called a city under the sea because like a city on land a coral reef Dusky butterflyfish is busy crowded and colorful A single Caribbean coral reef may be home to more than a thousand kinds of plants and animals A city fish must have street smarts to survive Day or night it has to defend itself from other fish that would snatch its food its mate its hiding place or the fish itself Royal angelfish
largest Cold oceans are like the country Country fish swim in cool waters far from the equator and tropical waters Cold water country fishes such as cod live close to the earth the ocean floor actually There are not nearly as many kinds of fishes here as in tropical seas and many of them look pretty much the same That is not surprising because several belong to the same family The cod is the largest member of a family that also includes pollock haddock and hake The cod fishery is one of the world's
lots of life but less variety Many cold water fishes travel in giant groups called schools Although this protects them from fish predators their schooling makes it possible and profitable for fishermen to capture thousands of fish at a time Pacific mackerel schooling in a giant kelp forest off the Channel Islands of California
