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Human Health Risk Assessment of Mercury in Fish March 2007, _& C& L- P, v4 X) p3 d+ b: G
and Health Benefits of Fish Consumption
2 a5 K3 R8 m. A9 P% QWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
( g2 @' ]7 d0 i6 G" ~7 g: ~present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical' k( o. Z4 v$ f1 j9 C
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the7 f+ \9 Y5 c$ X8 n) s2 B
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
, m7 ?- V# z% u) s8 ~8 ulevel increasing with age of the fish. In turn, bio magnification along the food chain leads to( M2 l5 I, Z$ [; [8 H
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other' t i7 b- I/ k! f, Z9 Y6 Q
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far: I1 q+ E8 I/ V8 B( x _
lesser extent than methyl mercury.4 p( D: r O9 x6 W
APPENDIX I
; r. Z% `1 r1 e' C' t& J+ {( s- |Summary data for those samples of fish that were found by the Canadian Food Inspection Agency( t" j1 ~( I. e) Q' G
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
5 s7 L3 j2 ~( K, F1 N# _) x& GSamples were collected at the importers= or at domestic processing plants during the periods April 1,! G* a& F/ O H5 @
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
5 T: T; B4 t, e. R4 Nconcentration of zero indicates that mercury was not detected above the analytical detection limit.
9 w3 X0 a K& q+ ]' e; ITotal Mercury Concentration
) c$ \5 R$ x# ?& j1 l(ppm): J: m, K5 o' T [, E- R$ D5 U
Species
* ^' }! b$ L ~- e2 M: c$ T& LNo. of& [1 v- z- i5 f* X
samples
$ u8 P6 Q- G$ e& B* R& a8 L1 |(N) Mean Median Min Max8 p' _ q8 ? s% G
Amberjacks 3 0.17 0.14 0.11 0.27" B, S4 r7 | i: O2 ~# o0 U
Barracouta 1 0.06 0.06 0.06 0.06( J9 @$ W2 h* Y' a9 N4 ^
Basa 5 0.02 0.02 0.02 0.02
0 q6 H2 F) C5 s/ [+ v5 nBullhead, Brown 2 0.09 0.09 0.07 0.1
6 s! L3 I# _ K2 V; Z$ m, J( SCapelin 4 0.02 0.02 0 0.051 z$ N+ P7 q# y1 r# ?2 B
Carp 1 0.1 0.1 0.1 0.1
, |9 }2 H7 F, K$ F1 eCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37, h4 T3 g* A$ _! R4 I- ^* D" T
Char, Arctic 5 0.09 0.10 0.05 0.05
6 w" ^; e w8 pClam (various species) 40 0.03 0.01 0 0.08' _ E8 O9 {. U5 C
Cockle, Greenland 1 0.05 0.05 0.05 0.05$ v0 [9 F b) d+ M& F
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28$ X( h6 g# W+ T% P+ ~
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37" H- b8 A I( ~# p
Crawfish 1 0.1 0.1 0.1 0.12 d* b9 j( T& n
Drum, Freshwater 2 0.22 0.22 0.03 0.4* b* ?" R4 v9 }# z
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
5 g4 N2 X w) Q* T I! TEel (species not specified) 107 0.24 0.16 0.01 1.70
" h" V* d) }% f% d/ I5 v+ X/ e- e8 @Flounder (various species) 22 0.06 0.06 0.03 0.12
% h2 \3 l7 W. J7 s2 Y4 [Haddock 3 0.05 0.05 0.03 0.07 |
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