328 



Fishery Bulletin 100(2) 



2 3 4 5 6 7 8 



Week 

 Oct 1997 I Nov 1997 



11 12 13 



Dec 1997 



I 



Figure 4 



Distribution of tagged greenspotted rockflsh in 1997 as depicted by the 

 weekly average rank calculated from receiving zones which were derived 

 from patterns of signal receptions. 



Tag-3, tag-7, and tag- 10 fi.sh moved greater distances, 

 and made relatively frequent short-term movements out 

 of the zone in which they were originally tagged and re- 

 leased (Fig. 5, Table 2). For these tags, 26-41% of the time 

 bins contained no signals. The maximum time recorded 

 for a tag in a single receiving zone was 32';f of the time 

 bins, and at least three zones were needed to account for 

 609f of the signals received from each tag. All three tagged 

 fish showed evidence of moving across the entire study 

 zone, a linear distance of 2940 m, and an area of about 

 1.6 km^. Chi-square and pos/-Aoc analyses indicated there 



Table 3 



Frequency of time lapse between signals after a time bin in 

 which no receivers recorded signals from tagged greenspot- 

 ted rockfish in 1997. NA = no signal was recorded for 67 

 davs. 



Signals from these fish were not recorded for the first 17 li that 

 receivers were in place and are not included in this table. Signals 

 may not have been recorded because of electronic interference 

 from boats in the area that prevented receivers from recording 

 signals. The other two fish i tag-7 and lag- 10 fishl were released a 

 week after receivers were in place. 



were significant (P<0.05) differences in the weekly aver- 

 age rank of receiving zone for tags 3, 7, and 10 (Fig. 4). 

 Transmissions from these tags were frequently recorded 

 in all receiving zones (Fig. 5) and the fish also moved out of 

 the study area for short time periods. The maximum time 

 between recorded signals from any of these tags was 30 h. 

 More than 90% of the time, the interval between recorded 

 signals was 5 hours or less (Table 3). 



