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Human Health Risk Assessment of Mercury in Fish March 2007$ s+ P2 G' N# U% e; i% \5 _
and Health Benefits of Fish Consumption
( e% }7 p$ d ^- G- \With respect to the types of mercury found in fish, both inorganic and organic mercury may be. J) P& X6 O. @, e
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
* _- C5 W0 y, Mproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the" `: P7 l4 f2 D: R
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury3 x& R" u% l% E# G! p. d
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
. h0 F4 t( y# `* o- x( |( Ohigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other1 H8 f2 V7 u. Y2 [% f9 Q1 \3 m
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
5 d- F" s" T0 O% R& b# t4 b/ Vlesser extent than methyl mercury.) \& j4 _7 J ~ B( ^
APPENDIX I
g$ J/ ^ K. kSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
5 v! P! W: C: _) {" l(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury. W2 P9 ?, ~/ |1 Y& H# W
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
9 \8 \. q) r' R' J2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
9 i* T* n; L. E6 F: m% ^concentration of zero indicates that mercury was not detected above the analytical detection limit.
, D0 S9 D- ?1 i7 x4 H( f" V) hTotal Mercury Concentration& p2 G' A1 A* {
(ppm)+ ], C$ z7 _$ g9 C9 [: }0 x* I
Species! Q; ^+ ^4 ?( E" F3 t' s2 x" l% N
No. of9 J0 ]( ~% S6 z, Y0 Y
samples) Q* `, N/ n! b9 M* W/ K/ n* C
(N) Mean Median Min Max9 U1 B# D3 ]8 E) X1 e3 [
Amberjacks 3 0.17 0.14 0.11 0.27
) ^ ]" _) k: j0 }! yBarracouta 1 0.06 0.06 0.06 0.06& ~5 a# ]# A3 H" S$ v! Z
Basa 5 0.02 0.02 0.02 0.02; ^' R/ I. x- k4 g& Y; ^
Bullhead, Brown 2 0.09 0.09 0.07 0.1) N7 R5 O7 e. v% K* z
Capelin 4 0.02 0.02 0 0.05
" x& w6 N& c4 T. D* t5 w( {Carp 1 0.1 0.1 0.1 0.1
8 K2 R2 z- R; [6 w G$ a2 ]Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
/ C2 {5 o" e& A4 TChar, Arctic 5 0.09 0.10 0.05 0.05# H( D. C6 l1 }: ~: L5 p
Clam (various species) 40 0.03 0.01 0 0.08
7 l& _8 A9 B; g& bCockle, Greenland 1 0.05 0.05 0.05 0.053 R f5 a+ B1 O5 q0 u1 g
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28 ^9 V. j/ U8 u7 m% k0 L: a
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.379 r4 k: U, z' F# O( d- E; R
Crawfish 1 0.1 0.1 0.1 0.1
; I" e5 T" c6 G+ eDrum, Freshwater 2 0.22 0.22 0.03 0.4' H3 A* T: C1 B7 P- z: U+ O, K
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76$ P6 v: c6 c6 _% R' j: S
Eel (species not specified) 107 0.24 0.16 0.01 1.70, Y1 q* e/ l3 F) X1 T# ^0 H
Flounder (various species) 22 0.06 0.06 0.03 0.12
7 ^ l6 Y) v; i# ~" L- b3 l H" ZHaddock 3 0.05 0.05 0.03 0.07 |
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