Collecting Methods Samples were collected from areas surrounding isolated coral heads. After selecting a coral head with a variety of forms about it a small quantity of powdered derris root, 2 to 3 pounds of 5% rotonone, was worked into the water. At the warm temperatures that prevailed fishes were immobilized and died in a few mimtes. Attached and sedentary forms were collected in the vicinity of the same coral head to complete the sample. The material collected was first preserved in 4% formalin, then transferred to 70% alcohol for shipment to the Applied Fisheries Laboratory for ashing and counting. Some surface activity was undoubtedly lost by this method of handlings Preparation of Material for Counting To reduce the material to a convenient form for counting, small samples, usually about pne gram in weisht were placed on one inch stainless steel plates and reduced to an ash. The samples were heated to 120° C. on a hot plate to start the reduction. After heating sufficiently to char, a drop of olive oil was added to reduce sputtering and give batter distribution of the material on the plate. The trays with the raised to 270° 6, After two hears yy tissue residue were then placed in a mffle furnace and the temperature heating the terperature was raised to 500° C, and maintained until a white ash was obtained. A drop of nitric acid was then added and the samples get aside to cool. After cooling the plates were mounted on cards and covered with cellophane for counting.