trout fishery, already declining rapidly, may 

 collapse before benefits can be expected from 

 the prevention of spawning. It is greatly to be 

 hoped that the field tests of larvicides will give 

 a means of shortening the time needed to re - 

 duce lamprey stocks. 



for the west shore of Lake Michigan at Oconto, 

 Wis., is to be established in early 1957. 



Fishery Research Program 



Research vessel Cisco 



Table 2. --Numbers of electrical sea lamprey control devices in tributaries of 

 Lakes Superior and Michigan, 1953-1956, and numbers scheduled 

 for 1957 



Year 



Lake Superior 



Lake Michigan 



Total 



1953 

 1954 

 1955 

 1956 

 1957 



10 



44 



46 1/ 

 48 2/ 



54 



\J 10 held in standby status on basis of previous season's experience 

 2/ 13 held in standby status on basis of previous season's experience 

 3/ Scheduled for completion by end of fiscal year 1957 



As the number of barriers in spawning 

 streams was increased the costs of mainten- 

 ance and operation consumed an ever higher 

 percentage of available funds, leaving less and 

 less for new installations. This situation ac- 

 counts for the slow progress in initiating 

 controls in Lake Michigan --only 7 barriers in 

 1954, 17 in 1955, and 19 in 1956 (table 2). The 

 greater allotment for fiscal year 1957 (table 1) 

 has permitted the scheduling of 55 new barriers 

 in Lake Michigan tributaries . Plans have been 

 drawn for the rapid completion of the Lake 

 Michigan control system and expansion into the 

 remaining lakes in the succeeding years . 



The expansion of the control program re- 

 quired certain administrative changes in 1956: 

 the Supervisor of the program, Erkkila, was 

 transferred to Ann Arbor; (the Assistant Super- 

 visor, B. Smith, continues at Marquette); the 

 Marquette field station was placed under the 

 direction of McLain; a new field station, under 

 the direction of Gaylord was established at 

 Ludington as a center for activities along the 

 eastern shore of Lake Michigan. A field station 



In the year of her launching (1951) the 



Cisco undertook only one cruise before financial 

 stringencies made it necessary to berth her for 

 the remainder of the season. This 2 -week voy- 

 age was made in cooperation with the University 

 of Illinois to collect cores and dredge .samples 

 of bottom sediments in Lake Michigan. 



The actual "shake-down" runs in which 

 the crew and biologists became acquainted with 

 the vessel and its equipment were not made until 

 1952. In that year extensive limnological ob- 

 servations and experimental fishing were carried 

 out in Green Bay and shorter runs were made in 

 northern Lake Michigan, Lake Huron, and Lake 

 Superior . 



The entire 1953 season was spent on a 

 fishery -limnological survey of Lake Superior 

 in which special emphasis was placed on the lake 

 trout- -its distribution and abundance in relation 

 to the environment, its life history, and its 

 associates. Through the use of trawling equip- 

 ment and specially constructed gill nets, trout 

 were taken at early stages not previously studied 



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