tSIMETESSOBUSS 



CARAPACE LENGTH (CO 



Figure 4. — Length distributions of lobsters caught above 

 and below 182 m. at Oceanographer Canyon. 



Lydonia Canyon 



Lydonia Canyon is at lat. 40°30' N., long. 

 67°40' W., 35 km. east of Oceanographer 

 Canyon. The area was sampled during research 

 cruises in April 1965 and in April, June, July, 

 and October 1966. Tows were made at depths 

 90 to 355 m. (50-195 fathoms). The dominance 

 of large lobsters here, as at Oceanographer 

 Canyon, is apparent both in the research catch 

 (table 8) and the commercial samples (table 9). 



Depth did not have a significant effect on the 

 ratio of females to males, or the mean size of 

 the catch, and the proportion of females did 

 not increase with the mean carapace length 

 of lobsters in a tow. 



In depths of 182 m. or less, the difference 

 between numbers of lobsters caught per hour 

 in daytime (14) and at night (18) was not sig- 

 nificant. In depths greater than 182 m., more 

 lobsters were caught per hour in daylight (33) 

 than at night (14) but the sample size was 



Table 8.- 



-Catch of 



lobsters 



by research vessels 

 1965-67 



, Lydonia Canyon, 





Females 



Males 



Total 



Females 



length 



Percentage 

 of total 

 lobsters 



Berried 



Berried 



Cm. tfmaber Number Nim>*.T- Percent Number 



5 



6 



7 



3 



9 



10 



11 



12 



13 



14 



15 



16 



17 



12 



19 



20 



21 



22 



23 







1 



1 



0.0 



— 



— 



2 



2 



4 



50.0 



— 



— 



3 



9 



12 



25.0 



— 



— 



9 



10 



19 



47.4 







— 



11 



21 



32 



34.4 



1 



9.1 



23 



21 



44 



52.3 



7 



30.4 



29 



24 



53 



54.7 



5 



17.2 



58 



12 



70 



82.9 



15 



25.9 



56 



26 



82 



68.3 



14 



25.0 



50 



27 



67 



59.7 



12 



30.0 



21 



22 



A3 



48.8 



4 



19.0 



7 



13 



20 



35.0 



1 



14.3 



16 



12 



34 



47.1 



3 



18.8 



9 



9 



18 



50.0 



3 



33.3 



5 



13 



IS 



27.8 



1 



20.0 







9 



9 



— 



— 











5 



5 



— 















3 



3 



— 



— 











1 



1 



— 



— 







Table 9. — Samples of the commercial catch of 

 lobsters from Lydonia Canyon, December 1965 

 to July 1966 



Carapace 

 length 



Females 



Percentage 

 of females 



Cm. 



Number Number Number 



Percent 



8 



22 



21 



43 



51.2 



9 



52 



60 



112 



46.4 



10 



63 



45 



108 



58.3 



11 



86 



57 



143 



60.1 



12 



91 



45 



136 



66.9 



13 



98 



61 



159 



61.6 



14- 



75 



48 



123 



61.0 



15 



57 



44 



101 



56.4 



16 



33 



57 



90 



36.7 



17 



30 



47 



77 



39.0 



18 



21 



42 



63 



33.3 



19 



9 



44 



53 



17.0 



20 



5 



30 



35 



14.3 



21 



2 



19 



21 



9.5 



22 







7 



7 



0.0 



Totals 



644 



627 1,271 



50.7 



small and more data are needed to substan- 

 tiate this difference. When catches from all 

 tows in 182 m. or less were combined and 

 compared with those in all tows made at 

 greater depths, significant difference in catch 

 per hour was apparent. 



Corsair Canyon 



The area sampled is at lat. 41°15' N., long. 

 66 22' W., 154 km. northeast of Lydonia 

 Canyon and 15 km. southwest of Corsair 

 Canyon. The area was sampled during re- 

 search cruises in April, June, and October 1 965 

 and in April, June, and July 1966. Table 10 



Table 10.- 



-Catch of 



lobsters 



by research vessels, Corsair Canyon, 

 1965-66 





Females 



Males 



Total 



Females 



Car apace 



length 



Percentage 

 of total 

 lobster 



Berried 



Berried 



Number Number Number Percent Number Percent 



9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 







2 



7 



24 



18 



30 



30 



28 



19 



20 



1 



2 







3 



1 



3 



8 



15 



11 



8 



18 



4 



8 



6 



1 



3 



3 



3 



10 



32 



33 



41 



38 



46 



23 



28 



7 



3 



3 



0.0 

 66.7 

 70.0 

 75.0 

 54.5 

 73.2 

 78.9 

 60.9 

 82.6 

 71.4 

 14.3 

 66.7 



1 



3 



13 



7 



15 



19 



16 



5 



12 



1 



2 



50.0 

 42.9 

 54.2 

 38.9 

 50.0 

 63.3 

 57.1 

 26.3 

 60.0 

 100.0 

 100.0 



r^tii^ 



289 



54.0 



181 



270 



