. Coast watch. Marine resources; Oceanography; Coastal zone management; Coastal ecology. year per 100. To extend the growing season for warm-water species, a plastic dome can be built for $40. How does the system work? The fin- gerlings are placed in the pool and fed a commercial feed. The biological filter and clarifier are used to remove the large amounts of wastes fish produce under the intensive feeding schedule. The clarifier removes the solid wastes, while the biological filter changes the ammonia in the water, which is toxic to fish, to nitrite then nitrate. The nitrate is food for the
. Coast watch. Marine resources; Oceanography; Coastal zone management; Coastal ecology. year per 100. To extend the growing season for warm-water species, a plastic dome can be built for $40. How does the system work? The fin- gerlings are placed in the pool and fed a commercial feed. The biological filter and clarifier are used to remove the large amounts of wastes fish produce under the intensive feeding schedule. The clarifier removes the solid wastes, while the biological filter changes the ammonia in the water, which is toxic to fish, to nitrite then nitrate. The nitrate is food for the algae in the pool. Van Gorder suggests stocking a backyard pool with tilapia. Tilapia are hardy fish, tolerant of a wide range of water conditions. They grow quickly in warm water. And, they taste good. "They're almost boneless," says Van Gorder. "They have a mild flavor, not fishy. The meat is very white, not mushy. To me it tastes better than ; Water quality can make a big dif- ference in the fish you produce. "You should test the water that you have to make sure there's nothing in it toxic to fish, or to people who eat fish," says Van Gorder. The North Carolina Department of Agriculture's Agronomic Division will test water for its nutrient levels. Send a small plastic container half filled with water to the Agronomic Division, Plant Analysis Center, Blue Ridge Road, Raleigh, 27611. Temperature is one very important aspect of water quality. Tilapia, for in- stance, grow faster when water tem- peratures are above 70°F. All species have an optimum water temperature at which they grow best and have the greatest resistance to disease or parasitism. "There is a range of tolerance above and below this tem- perature within which the fish will sur- vive, but with increasingly reduced growth the farther the temperature is from the optimum," writes Van Gor- der. "For a fish-culture situation to be economically feasible, the feed
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