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Human Health Risk Assessment of Mercury in Fish March 20074 l9 i. U+ r; x) n l/ t& [- `
and Health Benefits of Fish Consumption
( X# g8 j4 e6 v7 `1 Z$ D3 kWith respect to the types of mercury found in fish, both inorganic and organic mercury may be# z$ w0 V+ q& s
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical( T# {4 j1 c" y
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the5 g* e o' t- P5 t9 k( O; z3 H
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury0 H" r: u& F" y2 l1 {! a; }: W! U
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
3 g: i5 @: p# ?! Lhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
D9 e# B- Y( R" gorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far! {6 E/ G2 B/ V% b* z. w
lesser extent than methyl mercury.
* I& L" b" S qAPPENDIX I4 _# N+ i1 |' A4 u
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
" e O% Q* u8 x7 J' S(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
7 ~- [$ M# V& D0 h* o$ W* M# u) ~Samples were collected at the importers= or at domestic processing plants during the periods April 1,% t+ ?" e T0 d( ]
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
! T9 w- M( \5 k: g3 q2 iconcentration of zero indicates that mercury was not detected above the analytical detection limit.
7 X2 \- I& ?4 C* \0 i0 F% fTotal Mercury Concentration
3 a( ~9 d5 t, E4 r(ppm)
6 U1 ^2 ~- K# V0 eSpecies* Z5 a4 J; x3 [+ X" ~7 [8 [
No. of) g* r- W, ]: b( q, ]1 [
samples
. K4 p" |+ Y t5 Q(N) Mean Median Min Max# |, g7 W9 [/ x: p' D
Amberjacks 3 0.17 0.14 0.11 0.27
0 p+ v4 }8 e. D- d5 q) J9 J2 f9 [Barracouta 1 0.06 0.06 0.06 0.06 G( r G6 ]* O
Basa 5 0.02 0.02 0.02 0.02
9 k7 H, D! u2 ?6 |* c% ?Bullhead, Brown 2 0.09 0.09 0.07 0.17 _, O* e' O/ q2 M$ _
Capelin 4 0.02 0.02 0 0.05
* O- P7 z5 L3 z0 v1 LCarp 1 0.1 0.1 0.1 0.16 I% W) g6 d! \6 K. ^$ n
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
* l& k) L/ ~0 G9 R. u6 HChar, Arctic 5 0.09 0.10 0.05 0.05% l0 g3 v/ w4 N- h
Clam (various species) 40 0.03 0.01 0 0.08* F6 m" E0 Y. P) @( X" n
Cockle, Greenland 1 0.05 0.05 0.05 0.055 a7 ~7 Q% ? r2 c4 h8 T4 M( a
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
, v$ n; K6 a1 _7 U8 L1 G7 mCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37/ |2 `) }& s0 O6 ^: S' u5 t
Crawfish 1 0.1 0.1 0.1 0.1 r9 i! F& y2 c
Drum, Freshwater 2 0.22 0.22 0.03 0.47 ?7 U4 A0 s6 e: r
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76' Q3 b* E3 L" r
Eel (species not specified) 107 0.24 0.16 0.01 1.70
" ^2 |4 p5 B" e+ YFlounder (various species) 22 0.06 0.06 0.03 0.12
3 z5 D1 P1 k# r& B6 ?6 w! D5 bHaddock 3 0.05 0.05 0.03 0.07 |
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