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Human Health Risk Assessment of Mercury in Fish March 20075 t! q" b9 A' ^' \ J! F8 R3 f- u& }+ [
and Health Benefits of Fish Consumption
6 J4 I5 s/ s i/ Q, @; OWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
. X0 c/ r, W* W: P; L1 ypresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
1 u' C8 `' A# \% [2 L( J$ Tproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
4 H$ h: ^6 H3 c4 e) Aproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
' O0 O; V6 X/ H9 i" Xlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to4 K5 Z* J7 K) @7 W3 T, L
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
+ W: r I( u j6 L( d3 @$ T, ^organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far5 e2 p7 `; X8 S; ^
lesser extent than methyl mercury.: p6 A8 G" ]+ h% J+ l; f! @
APPENDIX I
1 J, p; j( W! X) ` ySummary data for those samples of fish that were found by the Canadian Food Inspection Agency" U* r* X8 b5 a' i) P* g2 Q/ t+ \
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
% k: ~& b$ C* A) ASamples were collected at the importers= or at domestic processing plants during the periods April 1,( Y$ {7 x$ H7 \/ X
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
% F: L% q0 p5 t4 Yconcentration of zero indicates that mercury was not detected above the analytical detection limit.' c# S* n. k8 V0 S
Total Mercury Concentration: M' w# U! r4 N2 j' J( O6 o
(ppm)
& N9 a: ?' y; W, ^2 I" RSpecies8 [' o1 F5 ]7 }6 a
No. of, s. a h0 d; Q( E$ z
samples, E- z+ b, L" a( B2 C" K
(N) Mean Median Min Max+ N* x6 \- c* u% C/ U& o% o! j' ]
Amberjacks 3 0.17 0.14 0.11 0.27
% \2 x. B& \( N" mBarracouta 1 0.06 0.06 0.06 0.06
E, ?* F3 ]4 P- PBasa 5 0.02 0.02 0.02 0.020 h8 z2 M) ]1 u" v; y
Bullhead, Brown 2 0.09 0.09 0.07 0.1% K A. G" P) _$ o6 `5 N- `
Capelin 4 0.02 0.02 0 0.054 S: J5 q0 p5 s. h5 C2 B' ]% x6 s
Carp 1 0.1 0.1 0.1 0.1, a, F& L) u% J+ N! P
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37$ B$ r; O3 R1 w* s# _( ?9 Q8 w8 v; Z
Char, Arctic 5 0.09 0.10 0.05 0.05
: w U9 \& E5 Z( L+ CClam (various species) 40 0.03 0.01 0 0.08 `' a; D {; L/ L
Cockle, Greenland 1 0.05 0.05 0.05 0.050 i, U8 O5 k* {
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
4 j& @) y; h8 OCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
1 z& j0 j ~1 P" d2 oCrawfish 1 0.1 0.1 0.1 0.1
! g4 u8 C) i2 T; U2 L0 qDrum, Freshwater 2 0.22 0.22 0.03 0.4
f4 C: ^% G( b8 L( c, Y1 x. h3 F; vEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
1 `5 z& U( |$ g4 [8 _% t) x+ SEel (species not specified) 107 0.24 0.16 0.01 1.705 i# f) M: F s" @ @
Flounder (various species) 22 0.06 0.06 0.03 0.12" ~( C" {7 |! h) r/ o
Haddock 3 0.05 0.05 0.03 0.07 |
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