Figures 



No. Page 



1. A summary of some regulations and historical catch and effort data from 



the commercial lobster fishery in Maine, 1930 through 1968 2 



2. Two designs of traps used in the commercial lobster fishery in Maine 3 



3. Sampling locations along the coast of Maine where the letter represents 



the county and the number represents each dealer in that county 10 



4. Actual sample sheet of catch and effort information compiled by boat 



and day 11 



5. Summary sheet of collected data for the sample-day 12 



6. Carapace length groupings of approximately 14%, compiled on a percent 



frequency basis by sex, month, and year, 1967 through 1970 26 



7. Accumulative percentages of lobster length plotted on probability paper 



by year, 1967 through 1970 28 



8. Mean surface water temperatures, recorded from 10 dealer locations each 



month of the survey, 1966 (partial year) through 1970 33 



9. The relationship between mean ocean surface temperature and catch in 



numbers per trap-haul by month for 1968 33 



10. The relationship between mean ocean surface temperature and catch in 



numbers per trap-haul-set-over-day by month for 1968 34 



11. The relationship between catch in numbers per trap-haul-set-over-day 



and boat-days by month for 1968 35 



12. The relationship between mean ocean surface temperature and catch in 



numbers per trap-haul-set-over-day by month for 1969 36 



13. The relationship between mean ocean surface temperature and catch in 



numbers per trap-haul-set-over-day by month for 1970 36 



14. The relationship between catch in numbers per trap-haul and set-over-days 



by year, 1968 through 1970 37 



15. Comparison of catch in numbers per trap-haul and catch in numbers per 



trap-haul-set-over-day with respective effort by month and year, 1968 

 through 1970 41 



16. The weight-length relationship of lobsters (sexes combined), W = 



.001682 L 2 - 82 826 43 



17. A simple catch curve calculated from the number of lobsters between 



consecutively numbered probability modes starting at 53-mm carapace 

 length 46 



18. The relationship between the calculated yield in weight (grams) per recruit 



and assumed age at capture (t c ) from binomial and cubic expansions 

 of the simple yield equation 53 



IV 



