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Human Health Risk Assessment of Mercury in Fish March 2007
8 @# {- x4 u) M6 land Health Benefits of Fish Consumption; ^6 c! K, L9 f
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
$ f' C! X$ g# X* n; u0 }! Kpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical3 j2 s4 B& L' D5 ^! {
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
6 l" N6 i" {4 |1 ^9 {; ]proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury/ w9 H! T: D3 _$ M' R0 u
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
; Q1 r6 n8 a+ ?higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
5 _6 \$ V% i, ]& G! _" borganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
. q1 [! h: U2 ?4 Vlesser extent than methyl mercury.! P! a6 X4 m$ Y* }: ^" L
APPENDIX I
8 t- k$ p! W2 D$ ^7 WSummary data for those samples of fish that were found by the Canadian Food Inspection Agency' N6 Y. H+ q$ a8 w) v0 s6 B
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
# _$ `- n5 _5 gSamples were collected at the importers= or at domestic processing plants during the periods April 1,
) L0 T s/ J" S/ d1 Q2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A2 t6 [% L& ?: v* ?1 |: M5 T+ y
concentration of zero indicates that mercury was not detected above the analytical detection limit.6 f; n# n$ S. U1 r- m, b
Total Mercury Concentration
. K# d$ `# d6 G$ S$ f; k5 }(ppm)# B/ w7 h$ d; G
Species
/ w6 A. `* h% j* }No. of
0 t4 N7 p7 G. _' P5 k, ]samples
4 r* n7 p4 f- b# i(N) Mean Median Min Max
1 o w' g a: t; D, @) c) H( GAmberjacks 3 0.17 0.14 0.11 0.27
5 j# Q6 E- D. w2 g( S& J+ y9 ?Barracouta 1 0.06 0.06 0.06 0.06
+ o+ [; n3 w$ s( c* F5 lBasa 5 0.02 0.02 0.02 0.02" e, ]' p$ Z- ]2 U6 z$ }+ a7 f S) q
Bullhead, Brown 2 0.09 0.09 0.07 0.1
- x# {* x- {: KCapelin 4 0.02 0.02 0 0.05
; N9 K( `2 @7 w% I8 V+ ?' @Carp 1 0.1 0.1 0.1 0.1! R1 @+ M6 E; p
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
/ q1 F$ X4 F( q5 nChar, Arctic 5 0.09 0.10 0.05 0.05% ]$ S: z' i0 d
Clam (various species) 40 0.03 0.01 0 0.08# R5 F+ v" f! P7 c8 E* D
Cockle, Greenland 1 0.05 0.05 0.05 0.05% k8 w$ |: @: u9 G: ]
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28. J( D3 @' `4 O. P/ b
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
* N7 W( |# c6 _: ~Crawfish 1 0.1 0.1 0.1 0.1
* K$ b5 H) D1 i) L8 i; TDrum, Freshwater 2 0.22 0.22 0.03 0.4
1 H. V8 K" i6 T" S# P. E, o! ?0 x( B% jEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
4 _* C5 }: J8 d' ~1 O* z9 YEel (species not specified) 107 0.24 0.16 0.01 1.70
9 c/ v& P6 b5 @: A# P2 @Flounder (various species) 22 0.06 0.06 0.03 0.12
1 C" D6 ], G* W& m3 MHaddock 3 0.05 0.05 0.03 0.07 |
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