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Human Health Risk Assessment of Mercury in Fish March 2007! H! {' d5 a5 U1 ]0 Z1 x
and Health Benefits of Fish Consumption: }% p8 s. x* r: O
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
, x* N# ?9 n% E% E5 j. I; w( O( Apresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
; v7 A# K: d, ~properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
8 ^$ ` @. y$ Q) @0 n3 b9 Q6 Jproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury$ H; r7 @$ X$ ?, h
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
0 j( l5 q. g" ] P7 M; Thigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other6 G/ b0 k) j+ }
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far9 p1 O/ Y& x4 ^! |8 F
lesser extent than methyl mercury.: p& ?5 i4 _/ t+ \
APPENDIX I
3 l0 v! b9 E; ]7 [Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
3 M" y- N2 c V9 x. w) T(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
* @3 E8 u: Z+ aSamples were collected at the importers= or at domestic processing plants during the periods April 1,/ J: R/ F& w- r2 B0 y9 x& s" a
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A" T8 W; ]) M3 Z$ w
concentration of zero indicates that mercury was not detected above the analytical detection limit.
! P: g# S' c$ I. k fTotal Mercury Concentration
, s$ c5 @, L8 i4 m. B( p, B' A, o(ppm)2 f- g% E, W9 R: c* K0 ?
Species4 R4 l) H: f9 O9 }3 y7 ~
No. of
! F; N3 \2 o+ i, t; L4 W. dsamples
# h# _( h& u$ b6 C(N) Mean Median Min Max
$ O+ t& H X, R$ iAmberjacks 3 0.17 0.14 0.11 0.271 e A% q3 |' E) O
Barracouta 1 0.06 0.06 0.06 0.06
% h. r4 J8 d1 M; B6 C) b, ]4 zBasa 5 0.02 0.02 0.02 0.02
. h0 V# D6 U& k' t$ ZBullhead, Brown 2 0.09 0.09 0.07 0.16 O. J* n" |- y. j$ j
Capelin 4 0.02 0.02 0 0.05! } y! j0 f0 Q- t5 D* m) K4 R
Carp 1 0.1 0.1 0.1 0.1
9 Y: f; T( E; v6 zCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.370 U- m- e6 N) G8 i
Char, Arctic 5 0.09 0.10 0.05 0.05
8 E% Q' i: C- ^+ X K+ ^! SClam (various species) 40 0.03 0.01 0 0.08
# l" z% K# g/ D' P- a3 x0 l: jCockle, Greenland 1 0.05 0.05 0.05 0.05
! K; F, j/ B' B/ p2 k" [* e& E, Q4 oCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28) K; W% q2 b, [( j
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
2 n! {1 Z# a8 X: WCrawfish 1 0.1 0.1 0.1 0.1
1 L8 x; g: G, e5 m0 {Drum, Freshwater 2 0.22 0.22 0.03 0.4
, S# n( |* U1 A& x' t0 l; ^0 _/ Y4 SEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
7 ~1 y+ b1 Z& M8 LEel (species not specified) 107 0.24 0.16 0.01 1.70
0 C# k+ e2 ?8 l( J7 yFlounder (various species) 22 0.06 0.06 0.03 0.12: h0 Y; _0 I a. q! r' c: ? o& z
Haddock 3 0.05 0.05 0.03 0.07 |
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