32 MIGRATION OF ADULT SOCKEYE SALMON. 
TABLE 20.—DiIsTANCES IN PuGEeT Sounp FRoM MarkxkiInG Stations To REGIONS 
WHERE FisH WERE TAKEN.@ 
Station. Region.| Miles. Station. Region.| Miles. Station. Region.| Miles. 
1 35 1 15.5 1 62 
2 47.5 ye SS Tee 2 59:5 
3 57 3 1.0 3 62.5 
4 45 4 35 4 35 
1 CES ate Fe t= 5 52.5 5 2850 Me vedee sce 5 35 
6 60 WRT. Sites 6 20 6 45 
6 71 7 33 7 35 
8 83 8 45 8 20.5 
9 92.5 9 59.5 Oli sea. ge 
10 122.5 10 89.5 10 30 
1 Pare S 1 33.5 
2 15 2 28 
3 21.5 3 29.5 
4 17.5 4 bleh 
Ns Sc dee ce 5 10 db a eater et oe 5 41.5 
6 215 6 13 
vé 33.5 ri RS 5 sip 
8 47.5 8 11.5 
9 62 9 27.5 
10 92 10 57.5 
a As it is obvious that the majority of the fish pass through Rosario Straits, the distances, wherever 
applicable, have been measured over this route. 
TABLE 21.—NUMBER OF SPECIMENS MARKED AT EacH Station TAKEN IN EACH 
REGION AND RATE OF PROGRESS IN MILES PER Day. @ 
ACE al nce ED) E. AS | SBS 5 oi ne 
Region 1: Region 7: 
Libk| (eee 12 49 23 A eee Wishes 2. ee 8 32 35 21 11 4 
Bate@-<ccs. os. AZSD Wewaeee 5.2 | 33.5 |..<.- 1: ae NAR mr aL] Pa 350 Pa 4,4 
Region 2: Region 8 
WISH 2 as 16 29 34 histeese ee Mish Poses 253 -e5 2 56 48} 131 14 
Rate... s2--s- 11. 3.6). ce = USS eee A See 11.1]10.3] 8&3] 46 3.2 
Region 3: Region 9: 
HSH oe ste ose |ees Lela ee as pe ae eee Bish. 25.4 san¢% 13 49 28 | 109 27 
Raves. oe asa laeecealedaars BY Ba ee Pe pee ate-s2 ce. cee 1208") 1005 || 95 1 Ol ae 
Region 4 Region 10: 
BIshe.. 5225-55 1 4 Blt race wren.c Piste. gockeeee 14 54 20 35 166 
Ratescso1see.5 22,5) ? BS OUNtBIO ka. Se abe 3oe Rate sss se 11.7] 14.6) 86] 6.8 4.5 
Region 6 
WS ere ee oe ee 23 25 ES erence 1 
Rater. ..o22-. LOSS {OSHS Seles se 11.2 
a No specimens were taken in region 5. 
Table 21 gives the results of these calculations of the rate in miles 
er day, together with the number of individuals on which the calcu- 
leas are based. From this has been calculated the mean rate of 
travel.? In doing this all cases have been omitted which were based 
on (1) less than 10 individuals, (2) a distance traveled of less than 
20 miles, and (3) a retrograde migration relative to the mouth of the 
Fraser River. This has been done to exclude, as nearly as possible, 
all abnormal figures. With these exclusions there remain 19 cate- 
gories on which to base the final conclusions as to the rate of migra- 
tion. The data for these 19 categories are given separately in the 
following table: 
a For this and other similar means the “harmonic mean”’ recommended by Yule (An Introduction to 
the Theory of Statistics), Rugg (Statistical Methods Applied to Education), and others, for the caleu- 
lation of mean rates based on units of work, has been used. The harmonic mean is defined by Ruggas 
‘the reciprocal of the arithmetic mean of the reciprocals of the individual measures of the series.” 
