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Human Health Risk Assessment of Mercury in Fish March 2007
* J7 m8 a+ }3 d: e' |) F, u, u/ jand Health Benefits of Fish Consumption& {' P* J# O9 ]$ d
With respect to the types of mercury found in fish, both inorganic and organic mercury may be% U, g' N. Z% l* k5 l/ X, R
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
; _$ j ] o! v6 ]# D% Yproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
5 D, S! e0 c( J( _( |8 Oproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury& e9 j+ Q7 m8 A1 v; O+ U3 Y/ o3 p
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
5 h4 c# R2 \, U, W* C9 ^higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
0 l( D! `' u" @organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far p- d+ Z- I `1 j3 d7 G
lesser extent than methyl mercury.0 J. z" E; ~ T3 X6 P
APPENDIX I2 J: S, K: \8 r; ]3 E
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency2 J& @. s3 f; ~8 x6 P, r* P3 G( G
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
0 ^* }% G( f: H* L I8 USamples were collected at the importers= or at domestic processing plants during the periods April 1,0 Z* _- v3 F( H7 p$ F# u( D" o' i5 s. h
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A, A# D$ c2 t. Y7 O y
concentration of zero indicates that mercury was not detected above the analytical detection limit.8 I7 w* {0 L+ `8 j
Total Mercury Concentration. i2 g# x% n; e, A& s0 J7 Q. ~6 x' O
(ppm)
5 X4 L3 n _: H0 [% HSpecies) ~0 H! l3 j% S: I' F; C6 X$ i- a
No. of
; z! x5 G; }! P* {) z6 X" N/ \samples6 n. F8 \* b0 O( U$ ? o& d
(N) Mean Median Min Max( W: d, v9 F# l A; ?* ^
Amberjacks 3 0.17 0.14 0.11 0.27, I0 {. N0 C1 P m: ]
Barracouta 1 0.06 0.06 0.06 0.06
* Y% c6 j: h% w. @4 |Basa 5 0.02 0.02 0.02 0.02
" w K6 ^* |# Z& I$ w3 r1 O5 eBullhead, Brown 2 0.09 0.09 0.07 0.1
" n" R2 T9 M, v8 @8 UCapelin 4 0.02 0.02 0 0.05
! U# ~; R; C" uCarp 1 0.1 0.1 0.1 0.1
+ x: S& _( m! s, D* n2 xCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
7 K1 X6 W. }/ N0 ZChar, Arctic 5 0.09 0.10 0.05 0.05
& V0 q6 C9 T+ s3 w7 k$ k& Q" gClam (various species) 40 0.03 0.01 0 0.08
' a z+ L. T4 B% [8 m; DCockle, Greenland 1 0.05 0.05 0.05 0.05
. e# ]/ o+ \! q5 x8 R% h, OCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
# _* z3 D# O/ U3 p) }- aCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.371 b8 t! ~% y* i4 c/ o) s
Crawfish 1 0.1 0.1 0.1 0.1
( j, ~ u7 a+ w5 ^$ UDrum, Freshwater 2 0.22 0.22 0.03 0.4: s/ P; c: b' h$ U& c
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
+ q- \, E& B! R5 {; u) bEel (species not specified) 107 0.24 0.16 0.01 1.70
1 Q, w: a0 n9 ]( r6 NFlounder (various species) 22 0.06 0.06 0.03 0.12
$ z* L1 ?' q- X& v+ j' G. k% YHaddock 3 0.05 0.05 0.03 0.07 |
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