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Human Health Risk Assessment of Mercury in Fish March 2007
* b2 r A8 P F9 }' Z8 _and Health Benefits of Fish Consumption6 O; J% W4 q1 E; C; G$ n5 O! C+ X
With respect to the types of mercury found in fish, both inorganic and organic mercury may be/ s+ M/ m+ u @8 C, @( f
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
0 ?2 f5 v! s1 T# q5 C6 Jproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the- } K$ }. X! q5 d: Z$ s- t
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury. L+ r a1 H4 |- Z/ w. Y
level increasing with age of the fish. In turn, bio magnification along the food chain leads to* g# ], t. N$ E) F! J$ k
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
3 l! J B+ ?% g. aorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
- e- `& x6 G% ~, Hlesser extent than methyl mercury." `5 ]# H; U- b" o8 _0 h- b
APPENDIX I
# d3 M: y4 T8 g8 y8 `Summary data for those samples of fish that were found by the Canadian Food Inspection Agency8 t% F+ j3 f- R6 N
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.7 l) S, X7 ?. T. p
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
" U& h/ U; H I9 w H2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
/ _8 t2 m$ ~: R+ [4 econcentration of zero indicates that mercury was not detected above the analytical detection limit.
) ]; P5 x& o b4 \Total Mercury Concentration0 Y( ^) M9 m I
(ppm)9 g5 s3 K0 B1 m+ h9 E l1 Q
Species* S6 `2 s Y9 z
No. of
1 f% h& \1 z& d* }3 C/ qsamples
# R; ~' }( G4 n2 H$ M0 d(N) Mean Median Min Max
# A0 Q' N% n1 A* YAmberjacks 3 0.17 0.14 0.11 0.27
7 l/ B* ?2 q: v( R. I3 bBarracouta 1 0.06 0.06 0.06 0.06
% ~8 \+ w! o" K, d) tBasa 5 0.02 0.02 0.02 0.02
) k3 f& p9 u1 s! G+ s1 m0 ?6 I4 S3 EBullhead, Brown 2 0.09 0.09 0.07 0.19 ]% g6 V0 G1 X
Capelin 4 0.02 0.02 0 0.05; ?8 Y0 n; s% v8 U
Carp 1 0.1 0.1 0.1 0.1# S* x+ o; i. B* F2 ~. F
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
# k- l- ]4 B" U2 u6 L& M% IChar, Arctic 5 0.09 0.10 0.05 0.05
, q" p+ A7 y( c# K$ e' `$ b7 WClam (various species) 40 0.03 0.01 0 0.08) U" F* |) H" p* ^3 u
Cockle, Greenland 1 0.05 0.05 0.05 0.05
. S+ d P, ~* J1 c! J+ y0 C3 PCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
' _- M# ~3 }; k/ q, fCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37% `4 n% B# |' R& e7 K& f
Crawfish 1 0.1 0.1 0.1 0.1
" O- t! H5 a) e0 ^+ V* z" I; @; BDrum, Freshwater 2 0.22 0.22 0.03 0.4
7 u- H: X# L2 H. q6 f3 h( qEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
3 X, o9 Y I2 S9 D+ N P" }Eel (species not specified) 107 0.24 0.16 0.01 1.70
" r0 w: z. d( T1 IFlounder (various species) 22 0.06 0.06 0.03 0.12
) l0 ~, L T' I) hHaddock 3 0.05 0.05 0.03 0.07 |
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