NEW YORK (Cont. ) 



October 1952, to close 1956; Paul C. Neth, Leader; reports available. 

 Address inquiries to: Dwight A. Webster, as in No. 1 above. 



Reduction of Competitors in Ponds by Methods Other Than Total Reclamation 



Many potential trout waters are not suited to reclamation by chemical 

 means. Reduction of competition by alternative means {trapping, partial 

 poisoning) is theoretically possible but the practicability needs to be tested 

 from the standpoint of long term benefits. Following initial reduction of the 

 competitors the problems resolve to whether satisfactory trout production can 

 be maintained by periodic control measures and/or biological control by an 

 increased predator population. 



Three waters are involved, of 140, 85 and 25 acres. Substantial reduc- 

 tions of the competing species (mostly suckers, Castostomus commersoni) 

 have been attained in two ponds. 



New York Conservation Department cooperating: rlerkimer and Franklin 

 Counties; began April 1954, indefinite; Dwight A. Webster, Leader. 



Address inquiries to: Dwight A. Webster, as in No. 1 above. 



Production of Brook Trout in Adirondack Ponds 



Seven ponds varying in size from 5 to 40 acres are included in the study. 

 Procedure consists of population inventories in the spring and fall designed to 

 yield estimates of total standing crop and mortality rates. Data on yield to 

 angling are also available. Annual plantings of marked fall fingerlings are 

 made to maintain the stock or to assist in evaluating natural production. 



New York Conservation Department cooperating; Herkimer and Franklin 

 Counties; began October 1954, to close 1958; Richard W. Hatch and Dwight A. 

 Webster, Leaders; reports available. 



Address inquiries to: Dwight A. Webster, as in No. 1 above. 



Attempted Improvement in Quality of Brook Trout in a Primitive Adirondack 

 Stream 



Brook trout in this stream are abundant but grow slowly and rarely exceed 

 10 inches in length (average 6-7 inches). The upper 10 miles of the stream and 

 its watershed are entirely on private land; fishing is controlled. Apparently a 

 heavy population of competing native species (suckers and minnow^ is present. 

 These have been eliminated in two headwater ponds from which they were mi- 

 grating downstream. Four two-way fish traps are operated on the stream 

 system for the removal of competing species and study of movements of all 

 species. Larger (10-13 inches) brook trout have been transferred from the 

 reclaimed headwater ponds in an attempt to provide some measure of biological 

 control. Scale samples, lengths and weights are taken annually from a sample 

 of the trout population and are used for judging progress of work. Inventory 

 by electrofishing of the fish populations is planned. Additional measures for 

 improving size of trout population consist of partial chemical eradication of 

 connpeting species in certain sections of the stream and artificial fertilization. 



New York Conservation Department cooperating; Franklin County; began 

 October 1952, indefinite; Dwight A. Webster, Leader. 



Address inquiries to: Dwight A. Webster, as in No. 1 above. 



Life History and Management of Landlocked Salmon (Salmo salar) in Little 

 Moose Lake 



The small but self-perpetuated population of salmon in Little Moose Lake 

 has been markedly increased by lake plantings of hatchery reared yearling and 

 two-year-old salmon. Growth and maturity pattern in these two groups shows 

 divergence; these are being studied in relation to the natural life history in which 



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