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Human Health Risk Assessment of Mercury in Fish March 2007
- y- V6 K. C* X) l6 xand Health Benefits of Fish Consumption& ]+ j* d" r# X* S; K1 h
With respect to the types of mercury found in fish, both inorganic and organic mercury may be: ]# g% H, j+ \; i6 A
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical% K0 U5 |/ q# D$ C( N
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the/ t% O1 _) l+ [5 u4 n3 F `5 R
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
$ z# e) H" s; v9 I$ ^2 h0 Slevel increasing with age of the fish. In turn, bio magnification along the food chain leads to ^* ~0 S5 a; w; I: O3 v6 e
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
% a5 V" Y$ ~5 Y6 K3 b( {organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
2 Y1 N# Q( `2 _6 Clesser extent than methyl mercury.
; R% r7 A3 S9 n' j) x1 q( BAPPENDIX I
2 J6 Z( M, z: H. E9 U3 X( t7 ESummary data for those samples of fish that were found by the Canadian Food Inspection Agency, M9 h7 L" @1 { t% J8 \
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
' I& ~* H! W7 N5 h! S* FSamples were collected at the importers= or at domestic processing plants during the periods April 1,* S1 s3 w9 H* H. N
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A. ^( C( [! s$ @8 l- q- L
concentration of zero indicates that mercury was not detected above the analytical detection limit.0 w( ^2 |/ T: r' }7 N1 `$ ~
Total Mercury Concentration
6 b$ M- p. p9 _7 B2 V(ppm)7 k5 _( n9 ]' i
Species; C5 U0 ~6 p8 f2 r5 T2 z
No. of7 v3 q( \% S& F( p
samples
; Y3 z" H K; O. O- Z$ V(N) Mean Median Min Max7 o2 M" S& }/ D1 C
Amberjacks 3 0.17 0.14 0.11 0.27) J3 ~& R: q' d/ D/ k
Barracouta 1 0.06 0.06 0.06 0.067 w% m2 p" ^# H; ]6 S- Y- w" v
Basa 5 0.02 0.02 0.02 0.02. i' S$ `5 g! M, t
Bullhead, Brown 2 0.09 0.09 0.07 0.1
, r2 m0 N1 j" wCapelin 4 0.02 0.02 0 0.05( s8 K4 F5 s9 ?% D1 E+ V8 \/ h6 s# g
Carp 1 0.1 0.1 0.1 0.1
7 }, K! ^9 R8 I/ d/ w" ?/ jCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.370 j) }$ N: l7 p: z
Char, Arctic 5 0.09 0.10 0.05 0.05) [, G2 X I0 w1 l8 V# I
Clam (various species) 40 0.03 0.01 0 0.08
9 x( e1 z/ n4 Q9 tCockle, Greenland 1 0.05 0.05 0.05 0.051 @! n1 _+ ]: l! L9 L4 }, K# ^
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
& F9 h: `( v) r4 d, I2 n1 G" LCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
) P6 q' `) p/ C& z# _ qCrawfish 1 0.1 0.1 0.1 0.1# k: j$ k: {, g) e0 z' }
Drum, Freshwater 2 0.22 0.22 0.03 0.4
* E Q" ^) i; _# T9 t R% Z8 b/ x: r6 FEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.768 M' k* i; j4 z3 X8 c0 h
Eel (species not specified) 107 0.24 0.16 0.01 1.70+ v P9 G7 ]$ j! J
Flounder (various species) 22 0.06 0.06 0.03 0.12# v- R6 u) y& {& [$ M6 t1 S
Haddock 3 0.05 0.05 0.03 0.07 |
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