Table 4 . Concentrations of total aliphatic and aromatic hydrocarbons 

 (measured gravimetrically) in oysters Crascoctrca gigas from 

 reference stations and from two estuaries contaminated with 

 Amoco Cadiz oil. Status determined according to pattern and 

 identity of GC peaks. 



Date/Sample 



December 1978 (9) 



Rade de Brest (reference) 

 Aber Benoit 

 Aber Wrac'h 



Hydrocarbon Fraction 



(pg/g dry tissue) 



Aliphatics Aromatics 



47.8 

 136.7 

 115.4 



208.0 

 552.2 

 540.0 



Status 



AC oil 

 AC oil 

 AC oil 



April 1979 (13) 



Rade de Brest (reference) 

 Aber Benoit 

 Aber Wrac'h 



AC oil 

 AC oil 

 AC oil 



August 1979 (17) 



He Tudy (reference) 

 Baie de Morlaix 

 Aber Wrac'h 



Other oil 



Other oil 



AC oil 



February 1980 (23) 



Rade de Brest (reference) 

 Aber Benoit 

 Aber Wrac'h 



62 

 154 



217 



87 

 275 

 599 



Other oil 

 AC oil 

 AC oil 



June 1980 (27) 



Rade de Brest (reference) 

 Aber Benoit 

 Aber Wrac' h 



33 

 238 

 132 



60 

 283 



430 



Other oil 

 AC oil/Other oil 

 AC oil 



a ' AC oil - Amoco Cadiz oil; other oil - definitely petroleum, but cannot be 

 identified as Amoco Cadiz oil. 



' month after the Amoco Cadiz oil spill, 16 March 1978. 



289 



