Since collecting and examining ten gallons of water could take a very long time, scientists use something called a plankton net. Plankton nets collect all the zoo-plankton from a large amount of water and concentrates them into a smaller amount of water. From this smaller amount of water you can collect a lot of zooplankton using an eyedropper. Challenge Make a plankton net and use it to collect animals swimming in the water. Observe these animals at varying powers of magnification.
Instructions Bend a coat hanger to make a circle with a handle.
Cut off a leg from a pair of old nylon panty hose. Sew the thigh-end of the nylon onto the coat hanger by folding about an inch over the coat hanger and sewing. Now cut off the foot. Slowly drag the net through the water. The water will enter the net and leave the net through the nylon sides.