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Human Health Risk Assessment of Mercury in Fish March 2007
5 O" I; N) X% k+ {and Health Benefits of Fish Consumption
O1 z- e) `, U, ?; f% aWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
- T/ p! k1 Z5 k# xpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical. W: H- l( Z4 m
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the% d$ C( k2 j7 T! C/ F: m
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
" X1 P% m% V, D/ y' `level increasing with age of the fish. In turn, bio magnification along the food chain leads to: H s6 v# W: r* O8 b5 j l7 G
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other: A' y6 m+ ]* C/ F6 w. m8 o
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
% H. {- c e6 o1 k! |; Glesser extent than methyl mercury.
2 n2 F, P; J/ z1 m) U" lAPPENDIX I/ q, X! } @% y7 x) N
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
$ L) T* M- h- E+ s; e+ v(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
; u# n! S* _. b, PSamples were collected at the importers= or at domestic processing plants during the periods April 1,; L7 n& F5 V* ]8 z
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
! K$ U) c3 h0 Y9 Iconcentration of zero indicates that mercury was not detected above the analytical detection limit./ q o' R4 F* T x3 A- O- V9 i9 p
Total Mercury Concentration
, W8 r9 ]. w# L3 l# j(ppm)0 g2 Z; o: F( j' ] b h; M5 E
Species
- V3 E5 T; ?# nNo. of
5 H1 q( }7 l* x P9 i1 \) J" t/ ysamples: L3 i: ]5 g6 [
(N) Mean Median Min Max
# U8 ^1 m# W& @2 @6 k9 }Amberjacks 3 0.17 0.14 0.11 0.27+ e" c) W) N5 H4 ]! {7 \8 x
Barracouta 1 0.06 0.06 0.06 0.06
: O$ ^3 @# g6 Y$ n. f& CBasa 5 0.02 0.02 0.02 0.023 O' E" V+ ?4 e) X# N% H% Z% r) M* v
Bullhead, Brown 2 0.09 0.09 0.07 0.1
% R# ?; `- M: ?) c5 R M% J2 m! pCapelin 4 0.02 0.02 0 0.05
4 h- j( ^, x+ mCarp 1 0.1 0.1 0.1 0.1
2 Y {4 ~$ f5 M Q G7 N$ [8 \Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37$ ]' {. a- R! f3 R" s$ W
Char, Arctic 5 0.09 0.10 0.05 0.055 H0 o: _' \8 j, U5 b, G" f
Clam (various species) 40 0.03 0.01 0 0.08
9 v: }# s1 a' l* N7 g( e; mCockle, Greenland 1 0.05 0.05 0.05 0.05$ b# X' ^9 z7 D: J" H' e# q
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
" n& r- h4 K1 t7 @8 }$ ZCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
% M. `, k. f4 t" BCrawfish 1 0.1 0.1 0.1 0.1
; _+ C; M# [0 r9 H. B" Z& W2 Y7 b" YDrum, Freshwater 2 0.22 0.22 0.03 0.4
; B: p5 A0 W) C/ g4 AEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
3 [6 O! R/ _9 [# W; BEel (species not specified) 107 0.24 0.16 0.01 1.70
8 H$ K( D: |# t1 h8 |" nFlounder (various species) 22 0.06 0.06 0.03 0.129 E ~1 A0 b1 c" H
Haddock 3 0.05 0.05 0.03 0.07 |
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