Table 13.— Probability sampling expansions of sandworm catch and effort (+1 SE) and ratios estimates for catch/unit effort ( + 1 SE) by month and for the 6-mo 



sampling period (1973-76). 



1 973 Sandworms 



Probability Sampling Expansions 



Ratios of 2 Variables 









Total 



Total 







Total 



Total 







Total 



No. of 



No. of 



Total Worm 



Total Catch 



Catch in 



Catch in 





Total Total 



Value of 



Digger- 



Di gger- 



Catch in 



in Numbers/ 



Pounds/ 



Pounds/ 





Catch in Catch in 



Catch in 



Tides 



Hours 



Number/D i g- 



Digger 



Digger 



Digger 



1973 



Pounds Numbers 



Dol lars 



Dug 



Dug 



ger Tide 



Hours 



Tide 



Hours 



April 



3,536,940 



72,111 



2,760 



5,749 



1,137 



542 









±3,032,880 



± 60,486 



±2,231 



±4,602 



±173 



± 97 







May 



10,11(0,130 



280,531 



8,372 



17,184 



1 ,165 



577 



_ 



_ 





±1), 240, 642 



±116,073 



±3,430 



±7,216 



±198 



±120 







June 



9,597,224 



276,118 



10,010 



21 ,742 



875 



412 



_ 



_ 





±3,810,652 



±111,477 



±3,071 



±7,162 



±245 



± 85 







July 



4,516,131 



124,195 



3,241 



5,545 



1,482 



863 



_ 



_ 





±1,266,239 



± 34,822 



±1,210 



±2,056 



±273 



±112 







Aug. 



4,590,400 



126,600 



4,960 



9,517 



930 



506 



- 



- 





±2,574,932 



± 70,722 



±2,518 



±5,125 



±215 



±131 







Sept. 



2,565,420 



78,271 



2,244 



6,267 



1,102 



404 



- 



- 





±1,971,590 



± 54,344 



±1,638 



±5,003 



± 67 



± 48 







Totals 



34,946,245 



957,825 



31,587 



66,004 



1 ,120 



559 



_ 



_ 





±7,336,435 



±196,789 



±6,055 



±13,418 



± 88 



± 43 







197^ Sandworms 



Probability Sampling Expansions 



Ratios of 2 Variables 



197** 



Total 



Catch i 



Pounds 



Total 

 t Catch in 

 Numbers 



Total 

 Value of 

 Catch in 



Dol lars 



Total 

 No. of 

 Digger- 



Tides 

 Duq 



Total 

 No. of 

 Digger- 

 Hours 

 Duq 



To ta 1 Wo rm 

 Catch in 



Number/Dig- 

 qer Tide 



Total Catch 



in Numbers/ 



Digger 



Hours 



Total 



Catch in 



Pounds/ 



Digger 



Tide 



Total 



Catch in 



Pounds/ 



Di gger 



Hours 



Apri 1 



36,001 

 ±20,352 



2,678,760 

 ±1,441,976 



76,915 

 ±41 ,638 



2,772 

 ±1 ,411 



5,661 



±3,013 



942 

 ±139 



459 

 ±31 



13.93 

 ±4.14 



6.79 

 ±1.55 



May 



30,212 

 ±27,853 



2,158,167 

 ±1,989,731 



64,745 

 ±59.692 



1,840 

 ±1,696 



3,910 

 ±3,605 



1,401 



+ - 



659 



+■- 



19.61 



+ - 



9-23 



June 



74,357 

 ±36,140 



5, MO, 463 

 ±2,704,834 



156,294 

 ±80,433 



4,872 

 ±2,186 



8,891 

 ±4,026 



1,076 

 ±262 



611 

 ±96 



14.91 

 ±3.75 



8.47 

 ±1.03 



July 



55,577 

 ±32,657 



5,146,778 

 ±3,068,389 



148,976 

 ±89,771 



6,188 

 ±3,623 



12,778 

 ±7,527 



803 

 ± 39 



391 

 ±16 



9.00 

 ±1.56 



4.38 

 ±1.15 



Aug. 



80,531 

 ±30,471 



5,583,067 

 ±1,877,012 



162,855 

 ±54,101 



6,413 

 ±2,328 



12,821 

 ±4,413 



929 



± 85 



433 

 ±59 



14.04 

 ±3.48 



6.55 

 ±1.78 



Sept. 



30,749 

 ±15,601 



2,795,450 

 ±1,416,962 



86.217 

 ±41,646 



2,695 

 ±1,217 



4,480 

 ±2,091 



1,020 

 ±167 



592 

 ±85 



10.91 

 ±1.82 



6.33 

 ±1.37 



Totals 



307,426 

 ±68,807 



23,772,684 

 ±5,319,814 



696,003 



±156,482 



24,781 

 ±5,448 



48,542 

 ±10,899 



1,028 

 ± 60 



523 

 ±24 



13.75 

 ±1.16 



6.96 

 ± -52 



40 



