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Human Health Risk Assessment of Mercury in Fish March 2007- T: L; b% {5 M
and Health Benefits of Fish Consumption. n6 B- w; g9 n! U7 j3 H
With respect to the types of mercury found in fish, both inorganic and organic mercury may be4 V5 X) ^4 j8 L( h
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical! _3 L- I) u! e1 I
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the0 S( S- E, D* U1 d) W: @4 S
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
$ b. `6 \: v: f3 p* n* Hlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to4 c( B9 u6 d! s4 x+ Z) p
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
+ p5 H; p0 s2 Norganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far" e- T5 E) a O( k' m1 e
lesser extent than methyl mercury.( i6 {8 i" L8 C7 \6 W
APPENDIX I
) K+ x4 \7 Z+ L# V4 p. o9 |5 ], SSummary data for those samples of fish that were found by the Canadian Food Inspection Agency! W5 X$ Y' U0 W) }6 y
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.) d$ G/ z" y1 M$ C8 ?
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
8 F" K* \7 G& C4 J0 E2 r! M2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
& ]+ q2 s4 D1 Z$ M" J2 Rconcentration of zero indicates that mercury was not detected above the analytical detection limit.3 c7 V" [& `' a1 K# j6 M
Total Mercury Concentration
3 `: C" y7 _* I+ h; K(ppm)0 U% u4 \& E" _$ v3 @8 K: @
Species
! @2 f* D- T9 h' r! v; u, BNo. of& r+ O" W4 H( l7 g& c, s
samples
( M, g3 Z7 C# S1 F% n8 @8 n5 v, E(N) Mean Median Min Max
1 H" g f) A# A( {Amberjacks 3 0.17 0.14 0.11 0.27" y7 x9 L' N$ q& _; G
Barracouta 1 0.06 0.06 0.06 0.06
$ J# l, `; ]# q/ O+ DBasa 5 0.02 0.02 0.02 0.02+ u3 q; z, j& y$ y
Bullhead, Brown 2 0.09 0.09 0.07 0.1
5 t; [' w% P4 b5 |9 cCapelin 4 0.02 0.02 0 0.051 `/ }- H' h' ~) e( W9 U
Carp 1 0.1 0.1 0.1 0.1$ l. h7 `# O4 K: k6 a0 D' _
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
- K2 P+ z. b7 |5 h0 S LChar, Arctic 5 0.09 0.10 0.05 0.051 m0 ]3 m+ H1 L' [6 e1 K8 }
Clam (various species) 40 0.03 0.01 0 0.08
# I7 c. x! v i$ v9 l4 cCockle, Greenland 1 0.05 0.05 0.05 0.05
* a0 G0 e# q& x) ?" Y, cCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28. z$ o$ i9 Z z# t) S4 A
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
1 [# t' h B1 s6 u+ W/ ?9 g4 FCrawfish 1 0.1 0.1 0.1 0.1
% W' ]+ ]6 r6 B. R, }Drum, Freshwater 2 0.22 0.22 0.03 0.4% x. }% w7 k. B i& D& V
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
7 ?: [2 ]! t r! Z& LEel (species not specified) 107 0.24 0.16 0.01 1.704 s J! y$ |8 Z7 d h. w L
Flounder (various species) 22 0.06 0.06 0.03 0.12
7 H9 g* a0 I% cHaddock 3 0.05 0.05 0.03 0.07 |
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