Streams that were sampled are listed by 

 number, name, and stratum in table 1. The 

 estimated escapement in 1956 is given for 

 the streams that were studied. 



Limited facilities restricted sampling to 

 eight stations, and even this number proved a 

 strain on available resources. As a result, 

 proportional allocation of the sample of eight 

 among the six strata was not possible, and ef- 

 forts were concentrated on strata 1, 111, IV, 

 and V, which included the major salmon produc- 

 ing streams. Omitting strata II and VI from the 

 sampling plan prevented estimating fry migra- 

 tions from streams in these strata. 



Appended to this report is a list by geograph- 

 ical area of the streams in Prince William 

 Sound. For future reference, the numbers as- 

 signed to streams in 1957 and those assigned 

 in previous years and the stratum to which each 

 stream has been assigned are given. 



Description and Method of Fishing 

 Traps 



Rectangular metal traps (fig. 2) were in- 

 stalled in the eight study streams at the earliest 

 possible date after April 1 consistent with ice 

 conditions. The traps were located above the 

 influence of tides in a line perpendicular to 



the streamflow. The number installed at the 

 various stations varied with the width of the 

 stream. The area of the array of traps was 

 approximately 10 percent of the total stream 

 cross-sectional area. The open ends of the 

 traps faced upstream, and the tops were 

 above water so that the entire depth of water 

 was fished. 



Typical of the problems encountered in the 

 field were those experienced at Olsen Bay. 

 Rectangular 3-foot traps were installed at this 

 station (fig. 3), and operations began April 2. 

 Melting snows and high tides raised the stream 

 to a level exceeding 12 feet above mean low 

 water, which overtopped the traps periodically. 

 Because of this interference, the 3-foot traps 

 were replaced with 5-foot ones so that all 

 water depths could be sampled. Operations 

 were discontinued at Olsen Bay on July 5. 



Fishing began on April 2 at Indian Creek 

 where the installation was moved four times 

 in attempts to locate a site where traps would 

 not be flooded by high tides. When traps were 

 moved to a site above the influence of 14-foot 

 tides, the spawning area was completely below 

 the traps. The final installation on Indian Creek, 

 which was completed on May 23, was about 250 

 feet below the upper limits of the spawning 

 area. Operations were discontinued on June 19. 



Table 1. --Streams selected for fry migration studies in 

 Prince William Sound, 1957 



