Table 2.— 



Recapture data for 74 shoalward migrating lobsters demonstrating shoaling of 10 fathoms (18.3 m) or more and 22 probable migrants 



whose recapture location 



was at least 50 nautical miles (92.7 km) from release and at least 50 miles from nearest margin 



of continental shelf. 



Figures 



Return no. 



Nauti- Days 



Average 



Depth 



Figures Return no. 



Nauti- Days 



Average 



Depth 



30-32 



and composite 



cal at 



speed 



change 



30-32 



and composite 



cal at 



speed 



change 



vector no. 



station no. 



miles large 



(mi/day) 



(fathoms) 



vector no. station no. 



miles large 



(mi/day) 



(fathoms) 



1 



3F-3 



102 29 



3.5 



60 



49 



293F-22 



38 60 



0.6 



14 



2 



29F-3 



77 118 



0.6 



75 



50 



307F-22 



48 72 



0.7 



22 



3 



4F-5 



11 36 



0.3 



34 



51 



308F-22 



48 72 



0.7 



22 



4 



26F-5 



38 37 



1.0 



18 



52 



309F-22 



48 72 



0.7 



22 



5 



27F-5 



38 37 



1.0 



20 



53 



316F-22 



41 48 



0.9 



25 



6 



28F-5 



56 50 



1.1 



78 



54 



336F-22 



42 89 



0.5 



25 



7 



10F-6 



24 33 



0.7 



42 



55 



337F-22 



42 89 



0.5 



25 



8 



18F-6 



18 49 



0.4 



29 



56 



339F-22 



44 86 



0.5 



20 



9 



19F-6 



18 49 



0.4 



29 



57 



222M-22 



22 23 



0.9 



14 



10 



20M-6 



18 49 



0.4 



29 



58 



242M-22 



35 25 



1.4 



12 



11 



8M-7 



72 39 



1.8 



37 



59 



243M-22 



40 28 



1.4 



20 



12 



41F-10 



20 60 



0.3 



10 



60 



248M-22 



41 31 



1.3 



24 



13 



25F-13 



75 28 



2.7 



38 



61 



258M-22 



32 37 



0.9 



23 



14 



221F-18 



12 54 



0.2 



10 



62 



261M-22 



35 41 



0.8 



19 



15 



240F-18 



66 32 



2.1 



36 



63 



278M-22 



30 45 



0.7 



18 



16 



249F-18 



186 71 



2.6 



68 



'64 



310M-22 



38 67 



0.6 



20 



17 



254F-18 



41 71 



0.6 



42 



65 



341M-22 



32 89 



0.3 



18 



18 



263F-18 



76 80 



0.9 



50 



66 



342M-22 



32 89 



0.3 



18 



19 



266M-18 



21 85 



0.2 



15 



67 



576F-23 



52 48 



1.1 



59 



20 



311M-18 



39 106 



0.4 



45 



68 



584F-23 



39 84 



0.5 



51 



21 



184F-19 



15 40 



0.4 



10 



69 



562M-23 



80 16 



5.0 



52 



22 



191F-19 



14 43 



0.3 



15 



70 



564M-23 



83 15 



5.5 



50 



23 



255F-19 



45 70 



0.6 



45 



71 



721F-29 



50 49 



1.0 



38 



24 



294F-19 



118 107 



1.1 



47 



72 



738F-29 



50 53 



0.9 



30 



25 



654F-19 



47 41 



1.1 



32 



73 



779F-29 



39 79 



0.5 



35 



26 



190M-19 



14 43 



0.3 



15 



74 



758M-29 



111 108 



1.0 



55 



27 



194M-19 



17 42 



0.4 



10 



75 



544F-7 



58 771 







28 



246M-19 



51 67 



0.8 



48 



76 



335F-13 



56 465 







29 



317M-19 



125 86 



1.4 



38 



77 



347F-14 



65 365 







30 



244F-20 



27 60 



0.4 



16 



78 



348F-14 



62 365 







31 



247F-20 



18 62 



0.3 



11 



79 



349F-14 



59 365 







32 



252F-20 



32 66 



0.5 



16 



80 



350F-14 



59 365 







33 



259F-20 



47 70 



0.7 



23 



81 



269M-14 



65 392 







34 



276F-20 



41 79 



0.5 



18 



82 



357F-17 



58 353 







35 



277F-20 



41 79 



0.5 



18 



83 



768F-17 



76 1,010 







36 



306F-20 



54 100 



0.5 



22 



84 



937M-17 



132 973 







37 



314F-20 



45 81 



0.5 



23 



85 



355F-18 



70 166 







38 



315F-20 



50 82 



0.6 



23 



86 



720M-18 



110 761 







39 



200M-20 



35 43 



0.8 



13 



87 



610F-19 



66 443 







40 



285M-20 



48 94 



0.5 



20 



88 



577M-19 



78 522 







41 



262F-21 



76 44 



1.7 



24 



89 



578F-20 



87 519 







42 



236F-22 



33 20 



1.6 



17 



90 



575F-22 



155 431 







43 



238F-22 



32 21 



1.5 



18 



91 



770F-22 



103 750 







44 



251F-22 



32 32 



1.0 



18 



92 



767M-23 



62 389 







45 



260F-22 



37 38 



1.0 



25 



93 



769M-23 



60 377 







46 



284F-22 



32 60 



0.5 



17 



94 



771F-23 



54 361 







47 



287F-22 



38 59 



0.6 



21 



95 



740F-27 



52 227 







48 



288F-22 



38 59 



0.6 



22 



96 



917F-27 



71 230 







averages 



are in good agreement with the 4-yr mean of 66 



as great as those of the first quarter; here, however, the 



fathoms (121 m). In contrast, the first 



quarter averages 



major source of deviation stems from a 



disproportionate 



show an 



almost straight-line cline ranging from 197 



number of deep-running recaptures taken in April 1970. 



fathoms (360 m) in 1969 to 127 fathoms (232 m) 



in 1972; 



Despite the shortcomings of the data, the 



clearly 



the implication of this trend is not clear because of the 



cyclical nature of seasonal depth change 



seems, i 



ndepen- 



relatively small numbers and large range of observations 



dent 



of net track analyses, adequate 



evidence of the 



from which these means were derived. 



If, how« 



iver, the 



tendency of offshore lobsters to optimize their year-round 



trend is 



real, it suggests that slope 



waters 



became 



temperature regime 



The consequences 



of this behavior 



progressively warmer 



over the 4-yr period to the degree 



are manifold in that metabolic rates 



and related life 



that optimal overwintering conditions (discussed below 



processes are doubtless accelerated relative to the coastal 



under Average Monthly Bottom Temperatures) were met 



zone 



populations which tend to remain 



highly localized 



at progressively shoaler levels. The sum of deviations of 



and 



hence subject 



to wider seasonal extremes and 



second quarter means 



from the 4-yr averages are almost significantly lower mean annual temperature. 



61 





