11. Weight frequency data from combined monthly samplings of the commercial bloodworm catch collected during the period 

 April-September of each year ( 1 974-76) 36 



12. Weight frequency data from combined monthly samplings of the commercial sandworm catch collected during the period 

 April-September of each year ( 1 974-76) 37 



13. The price/worm paid to bloodworm and sandworm diggers 46 



14. Bloodworm length-wet weight relationships 47 



15. Sandworm length-wet weight relationships 48 



16. Yield-effort curves 50 



Tables 



1 . Size and heavy metals analysis of sediment from the bloodworm and sandworm portions of the marine worm conservation area 

 at Wiscasset, Maine 3 



2. Physical properties of the sediment taken approximately halfway between the bloodworm and sandworm producing portion of 

 the closed conservation area at Wiscasset, Maine 3 



3. The numbers and value of bloodworms and sandworms landed by licensed marine worm diggers in the State of Maine between 

 1946 and 1980 4 



4. A summary of bloodworm and sandworm hoe measurements recorded east and west of Penobscot Bay during 1977 5 



5. Forms used in the collection of interview and sample information and the total landings of acceptable and cull worms 9-10 



6. The summary sheet for catch statistics data collected during each dealer daylight low tide period sampled 11 



7. The salinity content of water obtained from the hods and buckets of marine worm diggers and used in transporting bloodworms 

 and sandworms from the flats to the dealer 12 



8. Verification of the relationship of the mean length and weight of a 25-worm sample to the mean length and weight of the total 16 



9. A comparison of the diggers' time estimates with the actual time recorded 17 



10. A summary of bloodworm mean length and weight data, and the percentages of males, females, regenerated, broken, and 

 punctured individuals by dealer code, including monthly and combined 6-mo means for the period April-September 1973-76 18-19 



1 1. A summary of sandworm mean length and weight data, and the percentages of males, females, regenerated, broken, and punc- 

 tured individuals by dealer code, including monthly and combined 6-mo means for the period April-September 1973-76 . . . 20-21 



12. Probability sampling expansions of bloodworm catch and effort and ratios estimates for catch/unit effort by month and for the 

 6-mo sampling period ( 1973-76) 38-39 



13. Probability sampling expansions of sandworm catch and effort and ratios estimates for catch/unit effort by month and forthe 6- 



mo sampling period (1973-76) 40-41 



14. A monthly and 6 mo combined summary of bloodworm catch statistics data collected between 1973 and 1976 42-43 



1 5 . A monthly and 6 mo combined summary of sandworm catch statistics data collected between 1 973 and 1 976 44-45 



16. A comparison of catch/effort data obtained directly from the sampling and interview data and from ratio estimates 46 



17. The price/worm recorded by month during the commercial sampling program for bloodworms and sandworms (1973-76) . . 46 



18. The upper and lower confidence limits about the slope of bloodworm and sandworm length-weight regressions 49 



19. The numbers of bloodworms and sandworms per pound 49 



20. The numbers of bloodworms and sandworms per pound reported prior to 1970 49 



21 . The percent of licensed marine worm diggers digging bloodworms, sandworms, and both species (1973-78) 49 



22. The frequency of bloodworm and sandworm digging expressed as the mean number of low tide periods occurring since the last 

 low tide period dug 51 



23. The percent of the total number of bloodworm and sandworm diggers categorized in each increment of digging experience, 

 1973-76 51 



24. The percent of the total number of bloodworm and sandworm diggers interviewed in each age category (1973-76) 51 



25. The mean age of bloodworm and sandworm diggers interviewed during each sampling year (1973-76) 52 



26. The percent of bloodworm and sandworm diggers reporting that the last tide dug occurred during daylight or at night 

 (1973-76) 52 



27. The percent of male and female bloodworm and sandworm diggers recorded during sampling interviews (1973-76) 52 



28. The percent gain or reduction in bloodworm or sandworm production between 1975 and 1979 52 



29. Calculations of the desired frequency of monthly samplings for bloodworms to obtain a minimum accuracy of + 15% about the 

 mean estimate for 1) total catch in numbers and 2) total number of digger hours dug, at the 90% confidence level 53 



30. Calculations of the desired frequency of monthly samplings for sandworms to obtain a minimum accuracy of + 15% about the 

 mean estimate for 1) total catch in numbers and 2) total number of digger hours dug, at the 90% confidence level 53 



IV 



