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Human Health Risk Assessment of Mercury in Fish March 2007
9 f; `9 F" L) f- k, Qand Health Benefits of Fish Consumption
% [$ ~& I: o% pWith respect to the types of mercury found in fish, both inorganic and organic mercury may be b9 F/ k, r E& S$ O7 v% H" c5 _3 x
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
H) ^" f' N% v" X) y' Y, Z5 `properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the' j, I1 _( w% W$ X r
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury/ Q/ h. t0 W; f& P4 H
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
& S. K+ ]) j, ^/ _. v' G. thigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
- R! ]$ ?! o7 K) F9 u( K \2 O& M0 Dorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
4 b1 g% Y/ g; B/ P0 `: Wlesser extent than methyl mercury.
4 `. Y* Z$ l/ u+ w$ U9 s/ f$ s0 ZAPPENDIX I
3 Y! v6 w) G8 n! Y, pSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
5 g4 N w( c- o) u(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
* G3 n5 a& q: V# M& A4 ?* nSamples were collected at the importers= or at domestic processing plants during the periods April 1,' ]. U! v, H. \* d
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A4 f- x. m6 S0 @/ u2 G! F+ C/ T
concentration of zero indicates that mercury was not detected above the analytical detection limit.
4 I+ a% K5 ~& g/ ?7 I- zTotal Mercury Concentration
0 U! h9 t# H$ M, Y9 v(ppm)
5 U% Q: p7 t$ O6 e, j) t4 |0 ISpecies
1 |2 ]+ K, d: Y- ]9 qNo. of
' q' g% O1 R$ Tsamples7 Z, x6 x; I! l
(N) Mean Median Min Max" s: K% v2 M, f6 V; t9 r8 D
Amberjacks 3 0.17 0.14 0.11 0.27 I: P# K0 T8 i5 Q2 A
Barracouta 1 0.06 0.06 0.06 0.06
8 r# K- O0 z, v! s+ ]Basa 5 0.02 0.02 0.02 0.02
% }2 w& p) q1 K. c L+ v, uBullhead, Brown 2 0.09 0.09 0.07 0.1
W8 }3 {! Q$ A# q: ZCapelin 4 0.02 0.02 0 0.053 w& y# ?5 [2 j2 |+ |2 i' x
Carp 1 0.1 0.1 0.1 0.15 Z" s9 A9 p6 A1 [
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
- j5 O/ t1 ^) J0 H9 F: {) bChar, Arctic 5 0.09 0.10 0.05 0.05$ [8 r! `' G, O/ J# d
Clam (various species) 40 0.03 0.01 0 0.08
3 [+ ]( E( ^1 q1 a' BCockle, Greenland 1 0.05 0.05 0.05 0.05% {) E% `" R3 c6 ~, G2 V
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28/ Z" Y" K- f( Z' \$ }: V
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
5 Z9 T% \3 y1 [5 S! XCrawfish 1 0.1 0.1 0.1 0.1$ x+ |; ~/ G- R, k& a% ~
Drum, Freshwater 2 0.22 0.22 0.03 0.4
+ ?4 w+ A( t7 P6 K' E9 z( ~Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.762 k" H) {9 P. t
Eel (species not specified) 107 0.24 0.16 0.01 1.70
: ^% s$ ? n& B/ \- HFlounder (various species) 22 0.06 0.06 0.03 0.12$ t; s: K" w$ I+ I! X* {3 i/ X+ |
Haddock 3 0.05 0.05 0.03 0.07 |
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