Mean distance traveled by individuals with specific 

 capture locations (15) was 30.1 miles (55.8 km); four in- 

 dividuals (186F, 262F, 399F, 352M), all sexually mature 

 at release, exceeded the 50-mile (92.7-km) range from 

 release point. 



Maximum dispersion was attained by 399F which 

 moved a net distance of 82 miles (152 km) easterly over a 

 period of 167 days (0.4 yr). 



The defined migrants (4) within this group of recap- 

 tures are listed below with track bearing, ground speed, 

 and depth change: 



Return no. 



Bearing 



mi/day 



km/day 



fathoms 



meters 



262F 



032° 



1.7 



3.2 



+ 24 



+ 44 



352M 



304° 



0.6 



1.1 



+2 



+ 4 



230M 



117° 



0.5 



0.9 



-23 



-42 



231M 



117° 



0.5 



0.9 



-23 



-42 



Return 262F (44 days at large) approaches the idealiz- 

 ed view of seasonal shoalward migration, but 352M, 

 230M, and 231M do not. In view of their relatively short 

 term at large (22 days) it is possible that these last three 

 had simply reoriented toward the depth-temperature 

 stratum prevailing at first capture. 



Recoveries 185F, 186F, and 399F fall outside the 

 migrant classification, but represent significant disper- 

 sions with respect to time at large or distance. Both 185F 

 and 186F were at large less than 10 days, but made 

 seemingly directed tracks (without depth change) of 40 

 miles (74.1 km) and 52 miles (96.4 km), respectively, at 

 calculated ground speeds in excess of 5 miles (9.3 km) per 

 day. Return 399F (167 days at large) was captured at a 

 point 82 miles (152 km) westerly and 17 fathoms (31.1 m) 

 shoaler than point of release; this dispersion is open to in- 

 terpretation, but may represent the outbound limit of a 

 shoalward migration or simply a point on an inbound 

 return from an even shoaler location. 



Composite Station 22 (See Figure 24 and 

 Appendix Table 22) 



Forty-six recaptures have been reported from a 

 composite total of 422 releases some 20 miles (37.1 km) 

 southwest of the head of Corsair Canyon on 10 and 11 

 June 1969. Mean depth at first capture was 87 fathoms 

 (159 m); mean depth at release was 51 fathoms (93.3 m). 

 Thirty-nine lobsters were reported by specific location 

 and one by approximate location. Sex ratio at release was 

 280 females (66%) to 142 males; the ratio at return was 28 

 females (61%) to 18 males. 



Mean time at large for all accountable (43) recoveries 

 was 157 days (0.4 yr); greatest time at large for a located 

 individual (898M), a mature male at release, was 1,034 

 days (2.8 yr) with recapture 11 miles (20.4 km) from 

 release point. This individual showed a 39% increase in 

 carapace length at recapture which suggests that at least 

 two molts occurred during its time at large. 



Mean distance traveled by individuals with specific 

 capture locations (39) was 44 miles (81.5 km); five in- 

 dividuals (237F, 575F, 770F, 303M, 747M) surpassed the 

 50-mile (92.7-km) range from point of release by a con- 

 siderable margin (range 87-164 miles = 161-304 km). 

 Maximum movement was attained by 747M (see Fig. 24) 

 which was recaptured 865 days (2.4 yr) following release; 

 runner-up in this category was 575F, a large egg-bearing 

 female at release, which was taken in a coastal trap 

 fishery at Truro Beach, Mass., 431 days (1.2 yr) following 

 release. 



This group of recoveries includes the largest number 

 (28) and percentage (71) of definable migrants with 28 of 

 39 located recoveries meeting the "migrant" criteria 

 defined previously. The migrants here, as at station 20, 

 are characterized by large mean size, a high proportion 

 (61%) of females, and, among the females, a high propor- 

 tion (59%) with external eggs at release. 



Bearing, ground speed, and depth change are given 

 below: 



Return no. 



Bearing 



mi/day 



km/day 



fathoms 



meters 



236F 



316° 



1.7 



3.2 



+ 17 



+31 



237F 



240° 



4.4 



8.2 



-8 



-15 



238F 



337° 



1.5 



2.8 



+ 18 



+33 



251F 



338° 



1.0 



1.9 



+ 18 



+33 



260F 



331° 



1.0 



1.9 



+25 



+46 



284F 



322° 



0.5 



0.9 



+ 17 



+31 



287F 



328° 



0.6 



1.1 



+21 



+38 



288F 



332° 



0.6 



1.1 



+ 22 



+40 



293F 



329° 



0.6 



1.1 



+ 14 



+ 26 



307F 



302° 



0.7 



1.3 



+ 22 



+40 



308F 



302° 



0.7 



1.3 



+ 22 



+40 



309F 



302° 



0.7 



1.3 



+ 22 



+40 



316F 



307° 



0.9 



1.7 



+ 25 



+46 



336F 



300° 



0.5 



0.9 



+ 25 



+46 



337F 



300° 



0.5 



0.9 



+25 



+46 



339F 



310° 



0.5 



0.9 



+ 20 



+37 



208F 



117° 



0.8 



1.5 



-40 



-73 



222M 



322° 



1.0 



1.9 



+ 14 



+ 26 



242M 



333° 



1.4 



2.6 



+ 12 



+ 22 



243M 



330° 



1.4 



2.6 



+ 20 



+ 37 



248M 



325° 



1.3 



2.4 



+24 



+ 44 



258M 



317° 



0.9 



1.7 



+ 23 



+42 



261M 



331° 



0.9 



1.7 



+ 19 



+ 35 



278M 



317° 



0.7 



1.3 



+ 18 



+ 33 



303M 



243° 



1.6 



3.0 



-23 



-42 



310M 



341° 



0.6 



1.1 



+ 20 



+37 



341M 



317° 



0.4 



0.7 



+ 18 



+33 



342M 



317° 



0.4 



0.7 



+ 18 



+33 



All but three (208F, 237F, 303M) of the migrants rang- 

 ed significantly shoalward from point of release and were 

 recaptured within 89 days from date of release. Migrant 

 208F moved quickly toward deeper water approximating 

 depth at first capture; migrant 237F, a large egg-bearing 

 female, moved rapidly some 87 miles (161 km) in 20 days 

 to be recaptured near the head of Oceanographer Canyon 

 in only slightly deeper water; migrant 303M, a large 

 male, moved 123 miles (228 km) in 76 days to be recap- 

 tured on the east flank of Hydrographer Canyon in 

 significantly deeper water. These movements do not con- 

 form to a working hypothesis of springtime shoalward 



16 



