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Human Health Risk Assessment of Mercury in Fish March 2007
$ ~( d4 [& ]3 ^' v# sand Health Benefits of Fish Consumption
% h) P p( g' f9 C, y3 QWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
0 k' T; u: J% V- }: w5 J( kpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
7 y, [4 v4 |. ?& ~# N; |/ l; C4 pproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the2 e, F8 U' W( R) ?
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
7 _+ t( o' d3 f1 T0 N7 A! K; @level increasing with age of the fish. In turn, bio magnification along the food chain leads to
9 o' k9 V; p7 G2 nhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
5 ~* ]3 f, H* J) h# D# @8 j* dorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far5 O; C/ q% T8 I0 {& N. y/ h0 e
lesser extent than methyl mercury.; o0 M$ L# e5 S4 F$ {
APPENDIX I
) y8 H, N" k! oSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
7 E8 ` c N, g$ c; F2 w4 _(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
4 i% D6 K m% x; m2 MSamples were collected at the importers= or at domestic processing plants during the periods April 1,
# W* i- \+ Y; h" G0 \2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
6 I' G% _5 A/ k. W5 O/ [concentration of zero indicates that mercury was not detected above the analytical detection limit.. Y+ V5 ~2 K. A& I' T
Total Mercury Concentration9 g& E! c' W- U, j: O
(ppm)5 G2 k3 ] N2 K/ ~( G7 k5 r
Species- F2 V" W; Q' R! z0 V8 f2 {
No. of
5 t9 d7 g' m3 N+ F4 X- v; isamples$ I" e6 F4 r* [$ Q& G) V
(N) Mean Median Min Max
2 {( m& w: J- l; B$ `5 bAmberjacks 3 0.17 0.14 0.11 0.27
# s, R e" {' j7 S% XBarracouta 1 0.06 0.06 0.06 0.06
7 B- d4 y$ h( j$ l+ }0 ABasa 5 0.02 0.02 0.02 0.02, q M$ R# b$ `
Bullhead, Brown 2 0.09 0.09 0.07 0.1
# w! @ ]7 n3 M% ~3 n% y. dCapelin 4 0.02 0.02 0 0.05" L7 f0 J3 V9 x: f1 Y( E" h
Carp 1 0.1 0.1 0.1 0.1
2 e6 u$ H2 k3 Z3 d: k1 s: y$ SCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.370 h, e8 w8 @9 n
Char, Arctic 5 0.09 0.10 0.05 0.05
9 Z! J5 S2 g: n. {9 N6 R% K) p- JClam (various species) 40 0.03 0.01 0 0.08
$ I& E4 T8 @3 V) E2 w3 k% l5 V! RCockle, Greenland 1 0.05 0.05 0.05 0.05
# D* p+ h) c1 rCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.280 O( w3 c- ?2 h, d
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
) j% d& r7 c5 B+ E) hCrawfish 1 0.1 0.1 0.1 0.16 C' ?0 c: Q4 U. r2 B' a
Drum, Freshwater 2 0.22 0.22 0.03 0.4
& e1 _* M" P6 X& y# K- a/ A' WEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
/ i, B3 I, h* \ u1 u0 eEel (species not specified) 107 0.24 0.16 0.01 1.70
: {5 {& ^$ S/ {- O% OFlounder (various species) 22 0.06 0.06 0.03 0.127 t3 T! f: ~8 m! a4 s( T
Haddock 3 0.05 0.05 0.03 0.07 |
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