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Human Health Risk Assessment of Mercury in Fish March 2007
$ t$ } a& ^: k9 R, zand Health Benefits of Fish Consumption0 t* n3 ^: Q( r. I. E
With respect to the types of mercury found in fish, both inorganic and organic mercury may be) g4 Z) J1 D) n
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical W4 g! Y2 g: K n/ H( d
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the; h7 z* I: n- Z" x u7 k6 X& ~! l
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
z1 }4 F% }$ Ylevel increasing with age of the fish. In turn, bio magnification along the food chain leads to0 P" V/ y: l9 L
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other4 C$ ^: J; {" D: u! w- i. d$ S- H
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
/ y/ ]/ C1 E" J( z& i4 x2 _- T% y* Xlesser extent than methyl mercury.
8 N2 G8 ~) {! q, E' f8 ?APPENDIX I
4 L: r$ z% N/ ]2 {Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
' z9 m/ ^3 ^8 p# v, Q- [9 l(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
4 L* ?3 f% l4 y" H/ U5 u y" ISamples were collected at the importers= or at domestic processing plants during the periods April 1,
* j/ K. x5 ^8 H0 k7 A9 g# T9 \2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A8 w6 D. g, [+ g9 y- W {2 P, R
concentration of zero indicates that mercury was not detected above the analytical detection limit.
7 P# H9 @* ]* }+ M6 N5 S, h6 @Total Mercury Concentration
+ n, W, Q4 {3 T6 m9 S! K6 [(ppm)
" W1 `1 `, {" {1 W6 J; B8 ~2 zSpecies
- B& [, i+ I& X8 C: O. \No. of
- ?0 x2 j+ M( gsamples
f' g% H/ A1 f* F: f3 Y2 |* y(N) Mean Median Min Max+ D! ^. E( {1 ?, _! v
Amberjacks 3 0.17 0.14 0.11 0.27
% K* w. o* V! Z. V! e: {& E; NBarracouta 1 0.06 0.06 0.06 0.06& Y, Q$ f; f( u
Basa 5 0.02 0.02 0.02 0.027 D( ]+ G4 ^9 e1 j; j
Bullhead, Brown 2 0.09 0.09 0.07 0.1
% S% I+ c, T; k5 U, hCapelin 4 0.02 0.02 0 0.05! n0 h6 k4 l& x" N
Carp 1 0.1 0.1 0.1 0.1( d$ O" F7 [% N; \- Z
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
( \: k' X: L6 aChar, Arctic 5 0.09 0.10 0.05 0.05. x) ]+ C8 D- Y
Clam (various species) 40 0.03 0.01 0 0.08/ X# j5 d3 [- s! e4 P* {
Cockle, Greenland 1 0.05 0.05 0.05 0.05
5 u- N# O. p, RCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28- B' s" u7 E5 n7 t
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
' Q: [" ^0 f4 E& }4 h! I6 L. ?Crawfish 1 0.1 0.1 0.1 0.1
+ {1 X( U; _8 N5 Z! }% qDrum, Freshwater 2 0.22 0.22 0.03 0.4( v/ R0 K M9 R; t# I9 l& G7 M/ k
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76+ A% K4 \$ x, ^! o# P, m# i) M
Eel (species not specified) 107 0.24 0.16 0.01 1.70
1 U2 f# _3 h3 LFlounder (various species) 22 0.06 0.06 0.03 0.12) e, n5 ]7 Q8 O$ w4 f& D5 }- ?7 w' [
Haddock 3 0.05 0.05 0.03 0.07 |
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