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Human Health Risk Assessment of Mercury in Fish March 2007
/ I: b. l! Q' P2 Q+ v0 u: Vand Health Benefits of Fish Consumption# P |3 d( b4 `3 z
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
: p @" D3 G; M1 J/ L- npresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
5 C3 W' q1 L* C4 J, Mproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
" }- K9 B9 y! [5 y9 P: m: l d$ H; ~1 zproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
" l' C' ]. `4 I+ `: k$ M4 g; Llevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
+ B0 z9 _! a/ T5 f8 ]! o/ _higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other q$ }% @7 g; A* C6 Z
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
1 c' E/ k2 K$ Y/ A7 H) V% [7 R( ~lesser extent than methyl mercury.8 f0 E$ \$ P* x9 T/ I7 [
APPENDIX I4 f& ]3 \, p; a( k& R: F- o& K5 t$ l
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
# T1 h/ \$ V. \(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.; ^! ]- j3 R- a/ D* B
Samples were collected at the importers= or at domestic processing plants during the periods April 1,: ~ t1 u$ ?1 e
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
3 B# N8 b+ }9 aconcentration of zero indicates that mercury was not detected above the analytical detection limit.
1 m$ x4 t! [0 z; L; LTotal Mercury Concentration
* y7 D+ T* `6 e1 y(ppm)
7 P3 |- z5 p6 X+ _Species
( Z9 }) l U9 ]: SNo. of
! a. K0 W( m, i$ j, Esamples
' `9 l W |- T% x(N) Mean Median Min Max7 O, p8 M8 v+ B: T7 k9 r% T* y
Amberjacks 3 0.17 0.14 0.11 0.27. P/ p: P# G4 b2 ?
Barracouta 1 0.06 0.06 0.06 0.069 S( ?( s) r: N; t$ P! x6 D
Basa 5 0.02 0.02 0.02 0.02
% w0 X4 Q4 r Y- bBullhead, Brown 2 0.09 0.09 0.07 0.1
( V# I& T7 o% {1 D: y, bCapelin 4 0.02 0.02 0 0.05
0 D) |* O3 I& W; k7 J/ m# rCarp 1 0.1 0.1 0.1 0.17 M# h* z+ Z1 u
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37* j* a4 U4 q# T2 {
Char, Arctic 5 0.09 0.10 0.05 0.058 e3 c, u; a% W1 k
Clam (various species) 40 0.03 0.01 0 0.08
* Y5 S+ _' l" X' v6 a @Cockle, Greenland 1 0.05 0.05 0.05 0.05
5 G- B8 e( O9 A" NCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
7 ? E6 G& \6 T% @0 YCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37& _( z {1 @- M6 Q* |* L# o, [
Crawfish 1 0.1 0.1 0.1 0.1& g+ h* b& _0 N7 s
Drum, Freshwater 2 0.22 0.22 0.03 0.4% G ?; k. b0 M7 Y$ A; j) a
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
# _1 Y, T! Z% G2 ^Eel (species not specified) 107 0.24 0.16 0.01 1.703 i: U2 Q6 Y0 ^* A8 T
Flounder (various species) 22 0.06 0.06 0.03 0.12
/ j4 h7 {, b3 c: {$ E5 gHaddock 3 0.05 0.05 0.03 0.07 |
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