1990 Grayling Spavming Report 



TIMING OF SPAWNING 



RESULTS 



A total of 407 grayling were captured. The first ripe male grayling was 

 captured on April 21 in Swamp Creek downstream from the lower North Fork Road 

 near Wisdom (Figures 1 and 3). The first identified ripe female grayling was 

 captured in the Big Hole River on April 25 up river from the Clemow Road above 

 the town of Wisdom. The numbers of ripe females peaked during the period between 

 April 26 and May 8 (Figure 3). The numbers of ripe males peaked during the 

 period between April 24 to May 10. The only spent female was captured on May 8. 



N 

 U 

 M 

 B 



E 

 R 



O 



F 



F 

 I 



S 

 H 



80 



70 



60 



50 



40 



30 



20 



10 



APR 15 



OTHER 

 EE] SPENT FEMALE 

 ^ RIPE FEMALE 

 ■I RIPE MALE 



APR 22 



APR 29 



DATE 



MAY 6 



1 — I — I — r 

 MAY 13 



Figure 3. Catch of grayling 8.0 inches and longer in the Big Hole 

 River and its tributaries by date during 1989. Grayling 

 were segregated into "ripe male", "ripe female", "spent 

 female", and "other" categories. 



SPAWNING RUN CHARACTERISTICS 



Page - 8 



