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Human Health Risk Assessment of Mercury in Fish March 2007
1 p! T0 x0 w- q* e' tand Health Benefits of Fish Consumption; Q# P t: e$ b) L3 x* I7 A' y
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
% k9 b! @. L' e0 V1 n j# Tpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
. T0 V! E/ f# q/ j5 S" m/ }properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the, B: j5 Y% v. D4 N0 ?8 C
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury1 `0 n* h+ s$ c! U9 d
level increasing with age of the fish. In turn, bio magnification along the food chain leads to) _ H% X7 r2 K5 @4 J) G
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other1 {& C3 s3 @$ L
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
# n, _& E; f$ T3 G; rlesser extent than methyl mercury.
& M5 d+ \5 G- A. AAPPENDIX I! p' N$ H* d1 t7 H
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
! s! F/ ~+ k+ C5 ]! k) e(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.$ n, P. O# R6 P% S Z+ k3 q0 \# B
Samples were collected at the importers= or at domestic processing plants during the periods April 1,1 S! K0 J% r% x6 h4 q: i6 l
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
7 o3 r. E. r$ [: W/ Aconcentration of zero indicates that mercury was not detected above the analytical detection limit.9 x0 S$ @9 F. z. F$ c
Total Mercury Concentration8 i/ q6 [# @; [) w
(ppm)' M4 y5 B$ [$ ^1 z# ^) U5 s
Species' s% h1 h1 j0 Q4 K4 s
No. of
7 J+ S. n* P2 _( k9 `% V( w2 u4 p7 rsamples1 t6 H, w; }2 N0 `" q* z
(N) Mean Median Min Max! j) m4 z2 j: @, f3 A7 S
Amberjacks 3 0.17 0.14 0.11 0.277 Y. ^# |! X$ v! ?$ [( ?2 \
Barracouta 1 0.06 0.06 0.06 0.068 N: O$ p, l) O0 F- E
Basa 5 0.02 0.02 0.02 0.02+ n- p1 B7 O2 O0 [6 J( o0 z) Y V
Bullhead, Brown 2 0.09 0.09 0.07 0.1
, \9 B! V/ P: V1 m0 mCapelin 4 0.02 0.02 0 0.05
, l% i9 ^; w% x) KCarp 1 0.1 0.1 0.1 0.1
3 r* K/ t* n* _Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
* h w( i3 u8 r# G' _( R, ZChar, Arctic 5 0.09 0.10 0.05 0.05
6 i- `# E3 A" m9 f2 I9 a. k( I5 G% V/ EClam (various species) 40 0.03 0.01 0 0.087 g% f; h* _9 s4 v3 }, i
Cockle, Greenland 1 0.05 0.05 0.05 0.05 w6 i& h4 q/ j( h9 r7 X; w
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28! [0 P. O* I: h% E9 D' G" x
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
' k" X' Z8 P' K& q4 q: K6 [Crawfish 1 0.1 0.1 0.1 0.1
: R# m# q; W6 f& CDrum, Freshwater 2 0.22 0.22 0.03 0.4
7 G( u$ p4 |+ v% M/ M$ F) G8 TEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.765 |0 t# X. w% p: p
Eel (species not specified) 107 0.24 0.16 0.01 1.70
" w3 t/ g, [0 f3 i1 K/ i5 cFlounder (various species) 22 0.06 0.06 0.03 0.12
4 o6 k" A) J7 R8 [$ y+ @+ kHaddock 3 0.05 0.05 0.03 0.07 |
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