Figure 2. — Streams of southern New Brunswick and their access. Dots, sites of spot checks; star, site where coho salmon were 

 captured. Inset, province of New Brunswick, Canada, and northeastern United States showing location of aquaculture opera- 

 tions (Maine) or release sites (N. H. and Mass.) of coho salmon (squares) with respect to location of underyearling coho salmon 

 discovered in New Brunswick (star). 



stream gradient becomes lower, the surrounding 

 area is swampy, the stream is choked with alders 

 and inhabited almost exclusively by brook trout. 

 Coho salmon occurred through the middle riffle- 

 pool section and extended in diminishing numbers 

 into the swamp area upstream. 



To estimate the numbers of young coho in the 

 creek, two equal-effort electrofishings were per- 

 formed through the riffle-pool section and approx- 

 imately 50 m into the swampy section. The lower 

 fast section was fished separately during the first 



trip (28 October), but since it contained no coho 

 salmon it was omitted on the second 20 days later. 

 Although some coho salmon might have moved 

 downstream in the period between the two 

 fishings, coho salmon were scarce in most up- 

 stream areas on both occasions, suggesting there 

 were few above the point where fishing ceased. 

 Twelve coho salmon were caught on the first trip 

 and five on the second. The total population esti- 

 mated by the depletion method ( Seber and Le Cren 

 1967) was 21. Three coho salmon had been cap- 



488 



