# Make a dolphin

Life goes on forever like the gnawing of a mouse.

## Directions

The purpose of this activity is to create a 40 pound dolphin using a food chain with the following organisms:

• diatoms
• copepods
• oysters
• crabs
• fish
• dolphin

Make the following assumptions:

• A dolphin feeds only on fish.
• Only 10% of what an organism eats is used to grow to adulthood.
• All organisms being ate are adults.
• The average weight of an adult dolphin is 40 pounds.
• There are five feeding levels in the chain that feeds your dolphin. 1 - diatoms, 2- copepods, 3- oysters, 4- crabs, & 5 - fish
• The organism, from the bottom level to the upper level, is the food for the organism above it on the food chain.

How many pounds of each organism is needed to make a 40 lb adult dolphin?

How many pounds of diatoms?

How many pounds of copepods?

How many pounds of oysters?

How many pounds of crabs?

How many pounds of fish?

Hints

Hint 1:

Work backwards from the dolphin:

Hint 2:

Working backwards. Think about how much fish a dolphin needs.

Since only 10 percent of the material at each level is used to build the organism at the next higher level, it will take 400 pounds of fish to make one 40 pound adult dolphin.

Hint 3:

4 000 000 pounds of ________________;
400 000 pounds of ________________;
40 000 pounds of ________________;
4 000 pounds of ________________ and
400 pounds of ________________
to make one 40 pound ________________ .

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