. Cranberries; : the national cranberry magazine. Cranberries. ABOUT THE PROBLEM WITH HINCKLEY'S POND by Dr. Carl H. Deubert Hinckley's Pond in Harwich, Massachusetts, has become the sub- ject of controversies during the last three years. A discoloration was brought to the author's attention for the first time in 1973. In 1974 a small and unconfirmed fishkill was observed early in June 1975, and the formation of a white opalescent substance in association with an algal bloom (but no fishkill) caused the Board of Health of the Town of Harwich to close the pond to the public on August 3, 1975, a
. Cranberries; : the national cranberry magazine. Cranberries. ABOUT THE PROBLEM WITH HINCKLEY'S POND by Dr. Carl H. Deubert Hinckley's Pond in Harwich, Massachusetts, has become the sub- ject of controversies during the last three years. A discoloration was brought to the author's attention for the first time in 1973. In 1974 a small and unconfirmed fishkill was observed early in June 1975, and the formation of a white opalescent substance in association with an algal bloom (but no fishkill) caused the Board of Health of the Town of Harwich to close the pond to the public on August 3, 1975, as a precautionary measure. Two cranberry bogs drain into Hinckley's Pond, and chemicals from these bogs were suspected to have caused the problems. In 1973 an eyewitness saw from the nearby Route 124 "the chemical" turning the water yellow. An analysis of the water did not show more insecti- cide residues than in any other pond. The yellow color was caused by a tremendous amount of pine pollen. In 1974 it was too late to take water samples. On June 4, 1975, about 500 fish were found floating dead on the water surface, but no discoloration of the water was recognizable. Analyses of two fish and five mussels (mussels were alive when sampled) did not show any above average amounts of DDT, DDE, dieldrin, Methoxychlor, casoron or parathion. On August 3, 1975, an opalescent white discoloration could be seen next to an area of a thick brownish-green algal bloom. Algae and an unknown white sub- stance were washed into the sand about 200 feet along the shore and had a typical odor which is often found in sediments of streams and ponds. A total of two dead fish was found. One fish and three water samples were analyzed for para- thion and did not show more residues than expected. What caused the problems? The occurrence of pine pollen needs no further explanation. The two fishkills, however, are a little more difficult to explain. They happened on the second and third day after
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