How to Raise Fresh Water Lobster

Cover the bottom of your aquarium with medium grade aquarium gravel. This will give the crawfish a comfortable substrate in which to sit and move around.

Fill your aquarium with dechlorinated water. The water should contain some mineral deposits, such as calcium, but chlorine can easily harm or kill a crawfish.

Add aragonite stones or crystals to your aquarium's substrate or structures. These structures will lower the acidity level and raise the calcium level of your water, making it an ideal place for your crawfish.

Add a filtration system to your aquarium. You can choose from a variety of systems, but be sure the filter will remove ammonia and nitrate from the water, as crawfish cannot tolerate buildup of these materials.

Maintain the water temperature between 72 and 78 degrees Fahrenheit. This can be done with mechanical aids, or by simply keeping the aquarium in a room that you keep at this temperature.

Place structures in the tank for your lobster. These can include pieces of aquarium landscape, PVC pipes or plastic plants. Crayfish like to climb and hide among these structures.

Cover your aquarium with a lid or cover that features no holes large enough for the crawfish to crawl through. Crayfish like to climb, and if they escape the aquarium, they will dry out and die within a matter of hours.

Feed your crawfish at night, when he is more likely to be active. Crawfish can live on specialized flakes and pellets, but also enjoy blackworms and earthworms, brine shrimp, snails, insects and cooked vegetables.

Provide the crawfish with food to equal three percent of his body weight every day. If your crawfish is hungry, he is more likely to attack other fish in the tank or the substrate and structures within the tank.

Change your water at least once every two weeks to maintain a healthy environment for the crayfish. It may be easier to change half of the water each week so you do not have to move the crayfish while you work.