MASSACHUSETTS (Cont. ) 

 Fertilization of Sandy Pond, Ayer. 



Purpose is to control excessive growths of submerged aquatic vegetation prin- 

 cipally Myriophyllum in order to permit harvest of the fish crop. Sandy Pond, 

 Ayer (Middlesex County), covering 70 acres, is currently being treated at the 

 rate of about 1,100 pounds per acre per year of commercial fertilizer. Fertil- 

 izer is applied at 2-to S-week intervals in a narrow horseshoe-shaped pattern 

 extending half around the margin of the pond each way from the inlet side. 



Sandy Pond, Ayer; began April 1951, to be completed September 1953; averaged 



$40 per acre. 

 Address correspondence to: James Shepard, Project Leader, Bureau of Wildlife 



Research and Management, R. F.D. 2, Concord, Mass. 



Harvesting Studies. 



Objective is to determine rates of harvest of game and pan species by anglers. The 

 means employed are two-fold: (a) creel censuses on experimental ponds, and (b) 

 tagging of fishes both extensively and intensively. About 15, 000 fish are being 

 tagged annually. Six experinnental ponds are authorized but only two have been 

 employed so far. 



Statewide; began April 1950, planned for 5 years; Richard H. Stroud and Harold 



Bitzer, Project Leaders. 

 Address correspondence to: Richard H. Stroud, Phillips Wildlife Laboratory, 



Upton, Mass. 



"Salter" Brook Trout Investigation. 



Objectives are three-fold: (a) To add to life history knowledge of the "Salter" ten- 

 dency in eastern brook trout, (b) To learn whether runs of "Salters" may be 

 generated by overstocking, and (c) To determine what are some of the limiting 

 factors to the development of large "Salter" trout populations. The project in- 

 volves overstocking a once-famed "Salter" trout stream on Cape Cod with various 

 sizes of fin-clipped hatchery brook trout at various times of the year. This is 

 preceded and followed by periodic intensive sampling of the fish population in this 

 and a number of other streams in the area (connected only via the sea) by electro- 

 fishing and limited use of cresol and angling. 



Several trout strean^s of southwestern Cape Cod; began April 1949, to be completed 



October 1954; $7,000. 

 Address correspondence to: John H. Ryther, Project Leader, Woods Hole Oceano- 



graphic Institute, Woods Hole, Mass. 



Fish Population Estimates. 



Objectives are two-fold: (a) To evaluate possible trends of change in composition 

 of warm-water fish populations correlated with pan fish control activities, and 

 (b) To supplement pond survey analyses. Modified fyke nets are employed to 

 catch the fish. These are marked by removing one fin and subsequent captures 

 of marked and unmarked fishes serve as a basis for Schanbel-type population 

 estimates. These are conducted one or more times annually and are repeated 

 each year in selected ponds. 



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