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Human Health Risk Assessment of Mercury in Fish March 2007
6 W" v- l* `7 F3 L* G; hand Health Benefits of Fish Consumption
9 a+ V3 M* \# b" e1 _' h3 l: y. ] ZWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
. j T. s0 Z' L) X- upresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical4 o; x: j+ Q2 l* R) [
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the3 e* W$ u8 f- }3 o' X; q# w2 {# u
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
; x6 M) I/ u1 H( w2 Olevel increasing with age of the fish. In turn, bio magnification along the food chain leads to2 y8 o- {! C1 S6 y
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other. F8 b+ k" G$ j/ S$ r: m& m( q! O
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far- k, D" y0 D2 O6 `6 K
lesser extent than methyl mercury.( h& b' v) Q a2 K
APPENDIX I6 ?" }4 n' @, Y
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency# N8 b* ]& p& p1 q- {. s' d. S A3 d2 A
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
, ^; l: X1 U8 v$ R2 t- LSamples were collected at the importers= or at domestic processing plants during the periods April 1,8 A' g, T8 c. m2 o* P
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
3 W3 V1 g3 |: ], f9 Tconcentration of zero indicates that mercury was not detected above the analytical detection limit.4 X6 m; ] y) U5 J: P& r
Total Mercury Concentration6 ^2 D$ a, Q2 T- z5 r8 t. _
(ppm)( T9 x6 y3 @/ _# y( E& q* J2 Q
Species. ~9 D d; ]) X( V* |( f, x
No. of* E6 l5 v$ c) N7 Y. F7 M
samples
; y, e9 A4 O9 b$ R! s. S; @(N) Mean Median Min Max( Z) m/ l3 W8 y: ^4 _& E
Amberjacks 3 0.17 0.14 0.11 0.27
5 f+ _) x! i3 K4 `/ W" P3 `4 g% jBarracouta 1 0.06 0.06 0.06 0.06
. z/ P% X. R; S( X8 LBasa 5 0.02 0.02 0.02 0.025 \' T; h7 E$ _0 Q: ]0 d: y9 N* b
Bullhead, Brown 2 0.09 0.09 0.07 0.1
4 M: S. Y' S+ K% F/ T- _Capelin 4 0.02 0.02 0 0.05; |0 ]* z2 p6 t" e) Q% {. `
Carp 1 0.1 0.1 0.1 0.1
+ J9 p7 s& F7 x. P) L+ l$ R1 mCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
; y5 a4 T+ a0 {5 yChar, Arctic 5 0.09 0.10 0.05 0.05
: H3 |+ I' m& P% f% [Clam (various species) 40 0.03 0.01 0 0.08$ s3 o4 y& J- [0 f1 [' V4 [/ U- ?
Cockle, Greenland 1 0.05 0.05 0.05 0.05& ^# {/ H1 _8 D
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
2 ?8 p' b6 ~6 X1 p$ G3 }3 i# \1 PCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37% X+ w9 C7 ]7 Y5 O5 C
Crawfish 1 0.1 0.1 0.1 0.1$ x( k# Z, m, v) |( P2 l( T
Drum, Freshwater 2 0.22 0.22 0.03 0.4
% x6 d( S% a b" v, T6 _2 cEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.762 E+ Q/ m$ W/ ?3 q7 u
Eel (species not specified) 107 0.24 0.16 0.01 1.701 f# W/ b8 j, a n
Flounder (various species) 22 0.06 0.06 0.03 0.12
: V: O7 r( I* c6 xHaddock 3 0.05 0.05 0.03 0.07 |
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