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Human Health Risk Assessment of Mercury in Fish March 2007
% d; w' v; ^3 f$ |and Health Benefits of Fish Consumption
& B/ K M. x% ?$ M- p4 KWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
! J5 V$ ` e3 g6 y' Bpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical6 j7 u0 r1 U6 T
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the0 b; O8 X& [0 G7 E& ^5 M* {2 z
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
1 N8 u0 I+ D& O! K+ y, L$ Klevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
6 }8 c( ~7 d( ^; q, X0 P2 m/ \higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other3 H% l: C9 b0 m$ h
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
) b, O, l) _, Y( o% Q7 Glesser extent than methyl mercury.
$ z4 D% R- ^0 W* y. Y( |' IAPPENDIX I
* u& c* T6 P f% J; u. f5 ASummary data for those samples of fish that were found by the Canadian Food Inspection Agency
1 h3 V( i7 ^1 Z8 M5 e8 R(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
" ~3 w. O1 v7 p0 `( ^! u' U5 CSamples were collected at the importers= or at domestic processing plants during the periods April 1,
8 y f4 G$ D9 m2 T. V; e5 t2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
4 _" f- |( o9 J6 }2 T% z# Rconcentration of zero indicates that mercury was not detected above the analytical detection limit.$ f! V, M0 Q1 J6 t6 ~/ F$ |+ t
Total Mercury Concentration' w b/ E3 d' b! ]# d
(ppm)
' E# P8 m9 v8 O( GSpecies
' |$ E+ ^; k1 S1 {+ PNo. of6 P Y" }3 R1 K' ^: k2 K) T& K
samples
( P z6 d S. @- a(N) Mean Median Min Max, Q) R. q9 z; ~* g
Amberjacks 3 0.17 0.14 0.11 0.278 ?* q, J% c7 n, q9 N3 y8 X
Barracouta 1 0.06 0.06 0.06 0.06; P+ F) S! G, `
Basa 5 0.02 0.02 0.02 0.02
0 H) A- X. c/ e; HBullhead, Brown 2 0.09 0.09 0.07 0.1
U5 L3 \1 U& ], l- _! F0 ^& u' UCapelin 4 0.02 0.02 0 0.05
4 s+ `. A6 Y L" Q$ u- W4 SCarp 1 0.1 0.1 0.1 0.1. L2 Y! E5 L6 Q
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37+ A$ k# u& B0 P% ~- S
Char, Arctic 5 0.09 0.10 0.05 0.053 { U5 o7 ]5 Z) X' I$ c- ]
Clam (various species) 40 0.03 0.01 0 0.086 W: t$ b0 H6 m/ o& Z! S+ k
Cockle, Greenland 1 0.05 0.05 0.05 0.05
& G. E8 [. k( [Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
# q+ j! O, T8 z. VCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37# z! S4 c" w9 y0 m' Q) T
Crawfish 1 0.1 0.1 0.1 0.1
( {# L& C0 ]% s4 x8 ~4 JDrum, Freshwater 2 0.22 0.22 0.03 0.4& N1 p, W" O1 j j
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
$ K0 F' [# f& ^2 [8 u9 r6 ]Eel (species not specified) 107 0.24 0.16 0.01 1.70+ c- a$ g" d% }. Q
Flounder (various species) 22 0.06 0.06 0.03 0.12) E: B3 c, s C2 g4 R
Haddock 3 0.05 0.05 0.03 0.07 |
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