Table 1.— The distribution of samples containing bivalve mollusks 

 in the NEFC Specimen Reference Collection by collecting vessel. 



Samples 



Vessel 



Number 



Percent 



.4. S. Verrill 



6 



0.1 



Albatross III 



984 



9.4 



Albatross TV 



2,735 



26.2 



Asterias 



571 



5.5 



Blueback 



25 



0.2 



Delaware I & II 



1,998 



19.1 



Fish Hawk 



1 



<0.1 



Gilbert 



4 



<0.1 



Gosnold 



3,820 



36.6 



Harengus 



1 



<0.1 



Priscilla V 



3 



<0.1 



Shirley and Roland 



3 



<0.1 



Silver Mink 



18 



0.2 



Whaling City 



1 



<0.1 



Samples with no designated vessel 



295 



2.7 



Table 3.--Bathymetric occurrence of Bivalvia, 

 and 108,934 specimens. 



based on 10,465 samples 



Depth Range 



Samples 



Specimens 



m 



0-24 



24-49 



50-99 



100-199 



200-499 



500-999 



1000-1999 



2000-3999 



Unknown 



Total 



13.7 



15.8 



33.6 



22.1 



10.4 



1.7 



1.6 



0.8 



0.3 



100.0 



17.4 



15.5 



40.5 



16.3 



7.0 



1.6 



1.0 



0.4 



0.3 



100.0 



Table 2.— The distribution of samples containing bivalve mollusks 

 in the NEFC Specimen Reference Collection by type of sampling gear. 



Sampling Gear 



No. 



Samples 



Bottom Grabs 



Campbel 1 



Dietz-LaFond 



Petersen 



Smith-Mclntyre 



Van Veen 



WH0I Miniature Van Veen 



3,716 

 3 

 5 



2,099 



90 



2 



35.7 

 <0.1 

 <0.1 

 20.1 

 0.9 

 <0.1 



Dredges 



Digby drag 



Digby scoop 



Hydraulic Clam Dredge 



MBL Naturalist Dredge 



Quahog Dredge 



Scallop Dredge 



Rock Dredge 



WH0I Chain Bag Dredge 



WH0I Pipe Dredge 



1-Meter Naturalist Dredge 



Trawl s 



Beam Trawl 

 Dutch Herring Trawl 

 Isaacs-Kidd Trawl 

 Otter Trawl 

 6-Foot Seine 



Miscellaneous 



Bottom Skimmer 



Dip Net 



Diver (Scuba) 



Fish Stomachs 



Ring Net 



1-Meter Sled 



Other 



Samples with no gear designation 



323 



29 



37 



6 



19 



296 



19 



19 



4 



2,351 



1 

 1 

 2 

 2 

 33 



196 



71 



4 



97 



181 

 83 

 92 

 40 



3.1 

 0.3 

 0.3 

 0.1 

 0.2 

 2.8 

 0.2 

 0.2 

 <0.1 

 22.6 



<0.1 

 <0.1 

 <0.1 

 <0.1 

 0.3 



1.0 

 0.7 

 <0.1 

 0.9 

 1.7 

 0.8 

 0.9 

 0.4 



Table 4. --Occurrence of Bivalvia in bottom sediments, 

 10,465 samples and 108,934 specimens. 



Bottom Type 



Gravel 



Sand-gravel 



Till 



Shell 



Sand-shell 



Sand 



Silty sand 



Silt 



Clay 



Unclassified 



Total 



Samples 



5.5 



0.4 



6.0 



1.4 



6.0 



32.0 



12.8 



8.0 



6.5 



21.4 



100.0 



based on 



Specimens 



6.7 



0.3 



9.9 



0.9 



3.2 



24.8 



13.8 



7.8 



5.3 



27.3 



100.0 



129 



