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Human Health Risk Assessment of Mercury in Fish March 2007
, e. w3 b6 J& C) ]$ \8 jand Health Benefits of Fish Consumption K2 i9 k0 R; ]- Z U
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
" g3 l/ J% u4 B$ _+ O. `present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical9 Z9 J* {9 A- C9 R8 }1 M
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
! p8 o. m$ w8 J+ X: fproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury: o4 j, }5 W2 q8 X: l/ l
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
; q( N. j% k6 e$ B% V. c% {higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
& Y, M$ `6 |! y2 o/ sorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
1 N% f( H, i) A$ Elesser extent than methyl mercury.: k, W6 F' k1 r4 T8 n& T
APPENDIX I3 \) k4 D7 A3 k6 U& s. h ~
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
* H& `& [% n, S' ]0 Z(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.5 O" @& ^8 L8 y; w3 e
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
, g0 Z' C5 h! E2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A# T9 ]- n" ^% s% `
concentration of zero indicates that mercury was not detected above the analytical detection limit.( u' e! e! z8 U
Total Mercury Concentration
' T1 z4 _7 ~% m$ X( @(ppm)
2 }6 G/ z5 c9 ^2 H$ s/ [* pSpecies
3 P: N# N" t' H! z8 \3 ~No. of3 K$ J5 A( x/ d" f1 T$ y* {2 S
samples1 m6 c% R% I. X) i2 q4 C& F
(N) Mean Median Min Max
! a7 w( E& n1 R% [3 q. |Amberjacks 3 0.17 0.14 0.11 0.27" C) j: e6 ~* L6 U) c
Barracouta 1 0.06 0.06 0.06 0.06
Z6 M( ?% R, g# }6 p+ j8 UBasa 5 0.02 0.02 0.02 0.02
' e5 n( |# t" V" VBullhead, Brown 2 0.09 0.09 0.07 0.1. e4 }3 c+ Y0 r- f( Y2 I
Capelin 4 0.02 0.02 0 0.05/ R( p/ S5 T+ j# |/ Q+ U/ @
Carp 1 0.1 0.1 0.1 0.1
! `" {3 f H0 w+ oCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37* n9 J' n; v, y0 \& O- P1 ^
Char, Arctic 5 0.09 0.10 0.05 0.05, ^, d9 g& e# V8 Q- I( m% u
Clam (various species) 40 0.03 0.01 0 0.08' z4 z( J) l+ t1 h2 W
Cockle, Greenland 1 0.05 0.05 0.05 0.059 j" ~6 v& L5 R2 J% k F K+ Q
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
+ B- ^5 ?8 v0 e- C4 bCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37+ j3 r! s6 b) l# P% F$ w2 A$ S5 u3 j# I
Crawfish 1 0.1 0.1 0.1 0.1
; B" e5 _% [0 nDrum, Freshwater 2 0.22 0.22 0.03 0.4
. I; b" ^9 w: k$ p, ^9 iEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
4 l$ k* S: N2 y* j) F) T& X. U. t, V! XEel (species not specified) 107 0.24 0.16 0.01 1.70
! D1 ? @- i& a, yFlounder (various species) 22 0.06 0.06 0.03 0.12
: u8 S% i1 B9 yHaddock 3 0.05 0.05 0.03 0.07 |
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