Stair et a\ Movements of Sebastes paucispinis and S chlorostictus in Monterey submarine canyon 



329 



5- 

 4- 

 3- 

 2 - 



1 



5 - 



4 - 



3 - 

 2 



Tag 3 



Tag? 



Tag 10 



15 Oct 1997 



15 Nov 1997 



15 Dec 1997 



Figure 5 



Movements of tagged greenspotted rockfish (tag-3, tag-7, and 

 tag- 10 fish) across the study area in 1997 as depicted by changes 

 in receiving zones which were derived from patterns of signal 

 receptions. 



All tagged greenspotted rockfish, except tag-1 fish, 

 showed little vertical movement, and 99% of depth trans- 

 missions from each tag were within ±3 m (see Fig. 6 for 

 an example of this pattern). This distance is effectively 

 the range of tidal variation and the error associated with 

 the depth sensors in the sonic tags. Some of the fish occa- 

 sionally made short-term movements to deeper locations. 

 The only exception to this pattern was tag-1 fish that was 

 tracked for 18 hours, lost, then heard again 67 days later 

 It exhibited vertical movements of about 90 m in the hours 

 before it left the study area (Fig. 7). 



Bocaccio 



In 1998 we tagged 16 bocaccio, ranging in length from 35 

 to 58 cm (Starr et al., 2000). Ten of the bocaccio we tagged 

 were larger than the size at 50% maturity reported by 

 Gunderson et al. (1980). The receivers placed on surface 

 buoys in August and early September recorded continu- 

 ously; the total number of transmissions recorded from each 



of the tags in that time bin ranged from to 9531 (Starr et 

 al., 2000). The total number of signals recorded by the six 

 subsurface receivers that were deployed from 16 Septem- 

 ber through 30 December ranged from to 19,213 (Starr 

 et al., 2000). Ten of the tagged bocaccio spent little time 

 in the 12-km- study area (Fig. 8). Signals from three tags 

 were recorded only within a few days after tagging and 

 were not heard again (tags 13, 24, 26), either because the 

 fish left the study area or the tags failed to send signals. 

 Lengths of these fish ranged from 47 to 51 cm (Starr et al., 

 2000). Transmissions from five tags were recorded in the 

 study area for only 1-4 weeks (tags 3, 4, 10, 12, 21). Lengths 

 of these tagged fish ranged from 35 to 52 cm. Three fish 

 appeared to leave the study area and return two weeks to a 

 month later (tags 17, 20, 25). Lengths of these fish ranged 

 from 45 to 55 cm. Signals from the remaining five tags (tags 

 7. 9, 14, 18, 27) were recorded in the study area the entire 

 time. Lengths of these fish ranged from 47 to 58 cm. 



Signals from 10 tags were recorded in less than 10% of 

 the time bins in any zone (Table 4). Signals from one tag 



