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Human Health Risk Assessment of Mercury in Fish March 20077 }& d5 T- ^! S, i0 j5 U- t
and Health Benefits of Fish Consumption
& F; W1 ]1 l4 p2 F N, qWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
2 Z r* V1 a7 J9 \present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical" s ]. U2 V F' Z
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
6 J' y: {" y" [7 |1 Hproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
) B7 e# m( \$ B8 V8 X8 \6 Qlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
9 l: {/ F% T% f( L% j0 T5 D4 i1 J# ~higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other& ^) v( p% `- _
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
( H3 ~) `& k7 h0 G' r" V4 k$ Zlesser extent than methyl mercury.
9 b. ^$ t, B! Z: h# i" OAPPENDIX I
+ _( K" [3 @1 K/ F6 iSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
; v/ h$ x0 ]* }) L. f5 ^) v(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury." c r7 j+ }$ d0 J
Samples were collected at the importers= or at domestic processing plants during the periods April 1,/ F; \. `+ p/ t8 X) R8 [" T) `
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
; u! l, b* S+ h- econcentration of zero indicates that mercury was not detected above the analytical detection limit.* J# j5 g2 T( O9 `" |9 i
Total Mercury Concentration
# x* ]1 f8 D# ^: b(ppm)
9 Y. y( D9 l+ A: {' i4 T8 TSpecies
4 Q: @! `1 b, D) M% qNo. of
) v z& }: i, I. |1 \ j0 fsamples
+ B$ J% b4 V3 ?8 D+ B* G(N) Mean Median Min Max/ H" X7 b$ h# [
Amberjacks 3 0.17 0.14 0.11 0.27
7 j) {0 C- j O( O5 f. [9 D# sBarracouta 1 0.06 0.06 0.06 0.06
* }* F& h9 M! p) \$ e$ n9 dBasa 5 0.02 0.02 0.02 0.02
0 ^" U- ?! f' b* y8 |7 EBullhead, Brown 2 0.09 0.09 0.07 0.1
O7 _5 {: G/ W, ACapelin 4 0.02 0.02 0 0.05% V( S2 t, o8 \ s) e. U, E9 @
Carp 1 0.1 0.1 0.1 0.1
! h x$ n0 B4 H, G5 y% @$ N) v) WCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37; ?9 Y! U' \( I4 y& m' {6 m
Char, Arctic 5 0.09 0.10 0.05 0.05/ M' [2 Q$ K( O2 |7 h0 M
Clam (various species) 40 0.03 0.01 0 0.08! F( P) _9 m# f- a# N* q
Cockle, Greenland 1 0.05 0.05 0.05 0.059 t7 M! R# w# [ q! v
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
9 S$ t# m7 p# J% vCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37* W2 m6 a& j! ]' d+ j
Crawfish 1 0.1 0.1 0.1 0.1
1 H! D* c" b: ^6 l: V( kDrum, Freshwater 2 0.22 0.22 0.03 0.49 O- B7 I: Y6 i9 R+ O" z$ ]( ?
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
4 w* b$ J. l6 g# E- y3 iEel (species not specified) 107 0.24 0.16 0.01 1.70
7 w5 `; z' m _% s& v# ]# XFlounder (various species) 22 0.06 0.06 0.03 0.12# v7 S6 C, ~% `& v, E0 f
Haddock 3 0.05 0.05 0.03 0.07 |
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