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Human Health Risk Assessment of Mercury in Fish March 20075 {2 _0 c: {! ^& u# ~' s7 ^! q* v# H
and Health Benefits of Fish Consumption
; a0 |% u. Q& v0 @+ |6 tWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
( {+ d, g1 ]. w5 n9 ?/ v% @! N6 Kpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
5 |- `5 `0 a/ n4 Z: pproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the* Z' m$ A$ _, g+ o
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
2 M, c8 u; g; Z6 B$ Llevel increasing with age of the fish. In turn, bio magnification along the food chain leads to" x) ~- F5 L1 w3 ]9 M6 y# g% N
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
4 ?, }' Y, A, b" r8 \" H% Z- q+ {' f- qorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far; v0 Z; n8 K: o7 [3 @/ x7 y' v1 z+ {, N
lesser extent than methyl mercury.
. H: ]4 X/ u, K2 @APPENDIX I9 T9 f) B R3 X( x, b+ j1 w
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
- o& w( t! ?" w' X2 r, H, P! ~(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
) r, I G1 k+ y' o) s% A( USamples were collected at the importers= or at domestic processing plants during the periods April 1,2 N; F/ m4 u! W7 d& j4 F
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A5 Q/ _. R; P1 a1 P1 o
concentration of zero indicates that mercury was not detected above the analytical detection limit.
& r2 d5 a5 Z; s- @& |0 ^) kTotal Mercury Concentration; b( F( d( C. M( [( c
(ppm)+ d' F! o" X5 s: S+ @0 f
Species+ y. a5 Y x/ I5 R& a
No. of
2 |* d- q3 i) s2 W) q0 ]% M, i6 ]samples) Q; f* P0 ?$ R: _" K2 I1 k
(N) Mean Median Min Max( W* @6 w' H/ W/ _
Amberjacks 3 0.17 0.14 0.11 0.27
" N2 D4 J) R, k& _4 YBarracouta 1 0.06 0.06 0.06 0.06
8 ^4 I! J- U: Q, YBasa 5 0.02 0.02 0.02 0.02
' M5 C' C8 ~; d% i" @Bullhead, Brown 2 0.09 0.09 0.07 0.1
* K% y$ a- i- @1 W9 f4 @1 xCapelin 4 0.02 0.02 0 0.05; ~4 ~) N8 `9 ^3 O6 p! R
Carp 1 0.1 0.1 0.1 0.1& T, L0 M9 s8 E0 i* k% O
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
& D) P6 b: X8 K* UChar, Arctic 5 0.09 0.10 0.05 0.05
% S* x* V/ p; {9 T4 b3 w& fClam (various species) 40 0.03 0.01 0 0.08
. u5 i+ D) u% m7 ^& e+ q: FCockle, Greenland 1 0.05 0.05 0.05 0.05
- R, [, z, K& j% fCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
/ I I- }4 z- r# x- B* iCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.377 O* t4 v9 g' l- L& U
Crawfish 1 0.1 0.1 0.1 0.15 G+ v& a' Q; U9 C% t2 T' P
Drum, Freshwater 2 0.22 0.22 0.03 0.45 m/ A% q1 h$ V0 Q+ c" G2 W' m
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
$ b, v* a2 w) ^8 }: p2 L+ AEel (species not specified) 107 0.24 0.16 0.01 1.70' @% i6 g8 b& |5 J& b1 W
Flounder (various species) 22 0.06 0.06 0.03 0.12
' N; M, J; s; aHaddock 3 0.05 0.05 0.03 0.07 |
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