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Human Health Risk Assessment of Mercury in Fish March 2007
7 }0 U8 Q' U1 k& {and Health Benefits of Fish Consumption
) S4 j8 Z( {, U7 aWith respect to the types of mercury found in fish, both inorganic and organic mercury may be0 B6 T( Y& J) N9 D
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical% F6 S& ?& F( Z# S, L
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
- ?4 M+ N% s1 @" x- ]proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury) ]: k! A% X4 f, B" D- s8 T
level increasing with age of the fish. In turn, bio magnification along the food chain leads to2 B/ K" j0 H2 t3 o% j2 N9 E
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
3 M, l: U- y- h. B! e% Dorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
$ P, T/ h) g ~+ }; f5 q. Clesser extent than methyl mercury.
$ v+ L+ U) Y9 m& S3 H3 yAPPENDIX I* g; W* w0 K; ?0 e' K
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
* j) }5 I& h; X1 A6 J(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.3 y4 h1 u* o& w4 d/ B; k" y
Samples were collected at the importers= or at domestic processing plants during the periods April 1,, Z$ k$ v5 `- j
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A3 n) A* l( J5 k& R8 r! B' P1 r
concentration of zero indicates that mercury was not detected above the analytical detection limit.- G o0 f7 h' W+ _7 o0 O, `
Total Mercury Concentration0 S+ C) U; M6 @" m" k& O3 r! U
(ppm)
5 L* o8 U1 k6 ]Species* s _' N$ m" n
No. of6 f$ ]7 l. X- R$ R
samples+ B, F8 c9 S) J3 K+ \! x0 z; t
(N) Mean Median Min Max
) O9 X3 N6 K0 `2 s, ]8 hAmberjacks 3 0.17 0.14 0.11 0.27
5 X b3 k6 [9 b5 c9 sBarracouta 1 0.06 0.06 0.06 0.06
) j0 S& u U2 H8 A9 eBasa 5 0.02 0.02 0.02 0.02
7 I* X- L2 T( B& [: jBullhead, Brown 2 0.09 0.09 0.07 0.1
3 M9 P8 O9 L1 O, q$ {3 d* O+ jCapelin 4 0.02 0.02 0 0.05. C% R, [) I% d: X: u' B( ?
Carp 1 0.1 0.1 0.1 0.1
8 g- c# j" Q" B5 e& TCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
) N6 F. H5 L. s5 f6 z3 J* V( O" tChar, Arctic 5 0.09 0.10 0.05 0.05
# N: z- n- Q( s7 v0 U% YClam (various species) 40 0.03 0.01 0 0.08
0 ?; z A+ j( mCockle, Greenland 1 0.05 0.05 0.05 0.05" U4 l" {6 }+ o4 O
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28) X; E9 \8 R4 a X! j) @3 p
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37 c. N& S l, `9 c0 t$ q
Crawfish 1 0.1 0.1 0.1 0.1
' D7 H: L7 G, L4 P SDrum, Freshwater 2 0.22 0.22 0.03 0.4
; i; s1 Y6 w) n. f0 k, u( qEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76: M5 R% s, a; `! u( U- I) S
Eel (species not specified) 107 0.24 0.16 0.01 1.70
$ ? `. R5 ~' |+ cFlounder (various species) 22 0.06 0.06 0.03 0.12
, K8 @2 l) r0 n2 c7 y( p$ K8 NHaddock 3 0.05 0.05 0.03 0.07 |
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