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Human Health Risk Assessment of Mercury in Fish March 2007, t& G8 s- S+ x0 Z4 Y
and Health Benefits of Fish Consumption
! u& |& z1 T, X' A( [With respect to the types of mercury found in fish, both inorganic and organic mercury may be
: v0 l/ C6 Z6 F, |# m. Epresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
- K, j/ I. s& B4 mproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the5 i2 I4 v! n6 q
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
& X+ y A" R' A9 C" [% n' ^level increasing with age of the fish. In turn, bio magnification along the food chain leads to) j0 J. _4 o3 q; c
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
9 `, P0 |- ]6 ^8 T2 corganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
% m) F, }( i) z. u$ f0 Tlesser extent than methyl mercury.
, X0 E0 l0 S m7 qAPPENDIX I
8 V- f" A* u0 t7 w1 A3 T9 oSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
, P: j0 y" w, _# m% A(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
0 ^( S5 |, F' ]* V* g* R5 Q2 VSamples were collected at the importers= or at domestic processing plants during the periods April 1,
5 E# {& f* b4 y$ k6 p2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A2 n# G4 ?! W, D
concentration of zero indicates that mercury was not detected above the analytical detection limit.% i6 G" m) X( K3 |# f8 ?
Total Mercury Concentration0 O0 E- U. C o
(ppm)2 h2 w( s9 ~# v9 x8 F/ A
Species$ m" L, R8 u6 _9 R
No. of5 @3 ?0 ?, X1 y! ^' `( q$ d
samples( E8 W$ Z: n9 Q
(N) Mean Median Min Max2 ]5 Y' C$ |% f# w. ^8 [
Amberjacks 3 0.17 0.14 0.11 0.27
' N* l8 D4 D/ ~& b# eBarracouta 1 0.06 0.06 0.06 0.065 g, M, b; q7 i% E
Basa 5 0.02 0.02 0.02 0.02: b4 W `2 J$ t9 d0 V% `+ H6 f1 L6 C
Bullhead, Brown 2 0.09 0.09 0.07 0.1! u1 R! O* Z" M ]+ _
Capelin 4 0.02 0.02 0 0.055 v. b7 ?' I# V* n, U3 D9 U
Carp 1 0.1 0.1 0.1 0.17 `' P- P7 | g, a, y
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
" a; w, L! H3 z* ^$ J% MChar, Arctic 5 0.09 0.10 0.05 0.05$ j9 R" u. u, G u
Clam (various species) 40 0.03 0.01 0 0.08
9 ?1 v8 K. Q6 L' h) uCockle, Greenland 1 0.05 0.05 0.05 0.05
0 g* B3 u4 x& J5 L3 k% yCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
: }) q3 ^2 {4 bCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37* l0 d5 c3 V; K
Crawfish 1 0.1 0.1 0.1 0.1
4 K+ R: n4 m @6 @( L' {+ t. WDrum, Freshwater 2 0.22 0.22 0.03 0.4
( n5 N' Y# b: VEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
9 a2 a" Y( j0 f) f7 q2 BEel (species not specified) 107 0.24 0.16 0.01 1.70. s2 l0 @" w! Y% O9 A
Flounder (various species) 22 0.06 0.06 0.03 0.124 b v; X+ u7 c5 L& I- Y
Haddock 3 0.05 0.05 0.03 0.07 |
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