330 



Fishery Bulletin 100(2) 



1 1 1 1 1 1 \ 1 1 1 



2100 22 00 23 00 00.00 0100 02 00 03 00 04 00 05 00 06 00 



21 Oct 1997 22 Oct 1997 



Figure 7 



Depth distribution of signals received from tag-1 greenspotted rockfish in 1997 



were recorded about SO'X of the time, and transmissions 

 from the remaining five tags were recorded in more than 

 80% of the time bins. The six fish that remained in the 

 study area 50% of the time or more stayed in a small part 

 of the study area (Table 4». Signals from each of four tags 

 (tags 9, 14, 17, 27) were recorded almost exclusively only 

 where they were released, in receiving zones 4 or 5. These 

 receiving zones comprised an area of 168 ha and 201 ha, 

 respectively. Signals from the other two fish (i.e. tags 7, 

 18) were recorded primarily in receiving zones 3 and 4, 

 an area of about 400 ha. Chi-square and post-hoc analyses 

 indicated all fish stayed primarily in the same receiving 

 zones for the time they were in the study area (Fig. 9). 



Although the six fish that stayed in the study area 

 stayed primarily in one or two receiving zones, they often 

 exhibited small movements. Plots of zone numbers of re- 

 corded signals indicated that two of the fish (tags 7, 18) 

 frequently moved across all receiving zones (Fig. 10). Ad- 

 ditionally, cross-talk from receivers 5 and 6 indicated that 

 tag-27 fish made frequent short-term movements (Starr et 

 al., 2000). Tagged fish also occasionally left the study area. 

 Except for tag 17. which was not recorded in the study 

 area for 27 days, the maximum time interval between re- 

 corded signals from any of these tags was 57 h. More than 

 90*:?^ of the time, the interval between recorded signals was 

 5 h or less (Table 5). 



