lO 



BULLETIN OF THE BUREAU OF FISHERIES. 



Ten of the specimens are males and have an average length of 46.5 mm. The nine 

 females average 46.9 mm. 



Table 4. — Data for 19 Fry from Clackamas Hatchery, May 2, 1916. 



Length. 



Number- 



Scale record. 



Average 



number of 



rings. 



Average 

 length of 

 anterior 



radius. 



5xto 55 mm., 

 46 to 50 mm., 

 41 to 45 mm.. 



6 



5-6 

 4. 6 



Av. 46.7 nun. 



Several good collections were made May lo and 1 1 , 1916. These have been divided 

 into two lots. The first was collected on Puget Island and at Crandall's seining ground 

 on Grims Island. (See Table 5.) These points are located about 30 miles above 

 Astoria. The second lot comprises collections made at several points on the lower 

 part of the estuary, the best series coming from Sand Island and Point Ellice. (See 

 Table 6.) 



Two hundred and eighteen fry were taken at Crandall's seining ground and on 

 Puget Island. Thirty-nine yearlings were taken at the same time. The length of the 

 fry ranges from 33 to 98 mm. The average length is 52.5 mm., with the mode at 43 mm. 

 The sex proportion in this collection is 54.1 per cent males to 45.9 per cent females. The 

 average length of the males is 52.3 mm. and of the females 52.8 mm. The following 

 table (5) contains the data for this collection : 



Table 5. — Fry from Crandall's Seining Ground and Puget Island, Lower Columbia River, 



May 10, 1916. 



Length. 



Number of speci- 

 mens with — 



Scale record. 



Plate- 

 lets. 



Scales 

 with 

 rings. 



Average 



number of 



rings. 



Average 

 length of 

 anterior 

 radius. 



96 to 100 nmi. 

 91 to 95 mm.. 

 86 to 90 nun . . 

 81 to S5 nun.. 

 76 to 80 nun. . 

 71 to 75 nun.. 

 66 to 70 mm.. 

 6r to 65 mm. . 

 56 to 60 nun . . 

 51 to 55 mm.. 

 46 to 50 nun.. 

 41 to 45 mm. . 

 36 to 40 nun.. 

 31 to 35 nun.. 



Total 



Av. s'-S «""■ 



12. o 

 10. 6 

 10.0 

 10.0 

 9-3 

 8.1 

 8.1 

 6.4 

 6.2 

 5-2 

 4-6 

 2.9 

 1-3 



63. o 

 48.0 

 48.0 

 46.5 

 41.0 

 41.0 

 3--0 

 31-0 

 38.2 

 26.5 



32. 6 



16. 5 



13. O 



The collections made May 1 1 in the lower part of the estuary include 103 fry and 10 

 yearlings. There are 52 males among the fry averaging 46.7 mm. in length. The 

 51 females average 48.8 mm. The following table (6) gives the data regarding the fry: 



