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Human Health Risk Assessment of Mercury in Fish March 2007
2 y7 p$ X: a3 _" }1 n' T6 Z3 V" I( sand Health Benefits of Fish Consumption
: R7 ^& y! R" m1 V; d* L4 w0 \With respect to the types of mercury found in fish, both inorganic and organic mercury may be: a7 c, |5 ?0 ?$ z
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
. M0 H; D+ t6 w4 K, L cproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
W$ t+ @. U/ x6 Yproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury7 X! w0 Z( {. l. U- v2 H
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
1 ]; W0 F3 y Ehigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
1 T' R! q3 y- i" T ~/ ~5 |organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
! A- z4 ?0 J5 l( C. A5 Flesser extent than methyl mercury./ H# P1 n) b7 n
APPENDIX I9 c' k2 i4 t' Z! B/ R7 W
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
( ^* \) g F# E* z4 a( O3 T(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.% o7 r! ^9 X1 Q; v
Samples were collected at the importers= or at domestic processing plants during the periods April 1,& Q( R% ?) O! o& j7 I& J9 J9 u! ]
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A8 q$ Z0 _2 H# j- F. w$ p+ u
concentration of zero indicates that mercury was not detected above the analytical detection limit.
- G: F* ]8 C9 ^. [+ {Total Mercury Concentration
+ u7 C+ a" b1 L(ppm)2 C! o' C3 f1 G! O( u
Species
. j( j7 _) u" xNo. of4 E: }" A8 S: k& |% z4 z
samples
: Z, O# j1 g* B3 Y) ?5 r(N) Mean Median Min Max
( a- O2 H f6 y9 IAmberjacks 3 0.17 0.14 0.11 0.27
) c. v( S) @2 ?, }: U2 NBarracouta 1 0.06 0.06 0.06 0.062 q, P/ }2 H% Z' ^
Basa 5 0.02 0.02 0.02 0.02( r+ G* ^' V2 g, Y* d" U( Z
Bullhead, Brown 2 0.09 0.09 0.07 0.15 {. }+ |. H5 c
Capelin 4 0.02 0.02 0 0.05
O+ o2 C: s* g6 k4 NCarp 1 0.1 0.1 0.1 0.1
. g$ L6 C0 b9 Y5 {* RCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
: c3 t: E/ r4 Q& r6 g$ E0 GChar, Arctic 5 0.09 0.10 0.05 0.053 a, W2 Z# Z- I8 j8 a
Clam (various species) 40 0.03 0.01 0 0.08
2 ` a% H5 B: R; R- e3 mCockle, Greenland 1 0.05 0.05 0.05 0.05
" U% C7 S% w e3 Z/ K( }5 e9 l( GCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.283 A- `+ J- y# L0 D; A1 q
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.377 {! C$ M' A. _( G( d& S( P* E
Crawfish 1 0.1 0.1 0.1 0.1
( ~) z& [4 f" X* A* M; N5 W5 [( ODrum, Freshwater 2 0.22 0.22 0.03 0.47 h8 _6 f# K2 i- a
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
4 P5 R# v1 W! h. p* @/ I, @Eel (species not specified) 107 0.24 0.16 0.01 1.70
_# M* z" ?/ H) ]$ C2 EFlounder (various species) 22 0.06 0.06 0.03 0.12- q- k% T! ]/ U1 |7 x; u0 w
Haddock 3 0.05 0.05 0.03 0.07 |
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