328 



Fishery Bulletin 98(2) 



Table 2 



Growth rate (as percent body weight per day [7c bwd]), of tagged and untagged juvenile pink salmon caught m Auke Bay in early and 

 late growth periods (1 April-6 May and 7 May-16 June). Growth of tagged juveniles was calculated between release and recapture 

 within the early period and the number of days from the end of the early period to recapture within the late period. To calculate the 

 rate of growth of tagged fish, the average weight of the fish from release to recapture within the early period was used, whereas in the 

 late period the estimated weight offish at the end of the early period and at the date of recapture within the late period was used. The 

 growth of untagged fish was calculated similarly, except that the number of days from the beginning to the end of a specific growth 

 period was used. The standard deviation (SD), coefficient of determination (r-), and sample size in) are also shown. 



early April should be about 2.0% or more (Mortensen 

 and Savikko, 1993). Examination of growth residuals 

 from tagged juveniles in relation to those at "maxi- 



Epibenthic 



D 



Pelagic 



Nearshore Prey 



100 



1 Apr 5 May 20 May lOJun 30 Jun 



Offshore Prey 



100 



50 



1 Apr 



7 May 21 May 4 Jun 25 Jun 



Figure 6 



Index ofrelative importance I IKl )ol pink salmon prey during res- 

 idence in the nearshore and offshore areas of Auke Bay, Alaska. 



mum" feeding levels, indicates that fish in early April 



tended to have lower than expected growth rates, up 



to 291- lower depending upon the year. The slope of 



the residuals was lowest in 1988, when a higher 



proportion of the observations fell below the zero 



line throughout the temperature range observed. 



Intra-annual growth of tagged pink salmon 



Growth of tagged juvenile pink salmon generally 

 increased each year with successive release dates, 

 reaching a maximum in late April, and then declin- 

 ing for later emigrants (Table 1). Recovery year 

 is specified in the following sections, and brood 

 year (BY) is given in parentheses. In our study, 

 brood year corresponded to the spawning year of 

 the parental generation and was always the year 

 prior to the year when the sample was taken. 

 Growth of weekly release groups varied from a 

 low of 3.38% bwd in 1986 (1985 BY) to a high of 

 6.39% in 1988 (1987 BY). The decline in growth 

 of emigrants from late releases was not observed 

 in 1987 ( 1986 BY) and 1988 ( 1987 BY), when emi- 

 gration ended before the end of April. In 1986 

 ( 1985 BY), the lowest growth rates were observed 

 for the latest fish emigrating in the first week of 

 May. In 1989 (1988 BY), the lowest growth rates 

 were also observed for the last emigrants. How- 

 ever, these fish emigrated in the second week in 

 May; fish emigrating in the first week in May in 

 1989 ( 1988 BY) had growth rates similar to tliose 

 at the midpoint of the emigration timing. 



