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Human Health Risk Assessment of Mercury in Fish March 2007, E* m6 L* y$ ~$ P# K$ r8 b: _
and Health Benefits of Fish Consumption
0 |) }) p8 E% H9 JWith respect to the types of mercury found in fish, both inorganic and organic mercury may be2 k# X% _ k: m' o
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical! k8 G8 @2 w) j X0 z. }4 L3 T
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
! ~& h5 v8 A3 |1 Uproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury6 D6 X4 w& }: d9 j
level increasing with age of the fish. In turn, bio magnification along the food chain leads to8 {! j0 `- N$ e& c/ _" F! y
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
0 _6 \: ~( M/ b3 g% forganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
6 q9 D4 @: Z2 a) C& g: M0 Q* Clesser extent than methyl mercury.3 r( f5 V& _7 ]6 d
APPENDIX I
8 _1 U; g8 e* a* s; N% X) }Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
T1 W: l# w# I& d; I, v(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.- H' R: F" m ^" h, i; I( u6 @+ t# N
Samples were collected at the importers= or at domestic processing plants during the periods April 1,+ Z$ v& ?! @% e. u. y: L
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A) @! F2 c, U$ y, d% h- v
concentration of zero indicates that mercury was not detected above the analytical detection limit.
9 P6 R$ W) B. n! M# C5 y4 oTotal Mercury Concentration5 S S0 G0 Y" P3 P
(ppm)
7 I2 K7 N0 Z, F q$ Q1 h4 PSpecies& E- T0 i7 y: a, E1 r( o. l9 P$ Z
No. of' R" {2 q1 s- V% K0 w1 g: i
samples
/ r2 Q, l& E0 d- A1 c1 ?( z(N) Mean Median Min Max( t5 r6 `9 e8 u8 X
Amberjacks 3 0.17 0.14 0.11 0.27
$ r* G$ G+ J* k8 |9 uBarracouta 1 0.06 0.06 0.06 0.06, K! x X8 E% \; T' ~, H
Basa 5 0.02 0.02 0.02 0.02
& ~7 n' H/ L) f9 GBullhead, Brown 2 0.09 0.09 0.07 0.1, a5 N3 L7 s8 I, X2 l
Capelin 4 0.02 0.02 0 0.05
! m" W3 j) @1 I- b" i! l rCarp 1 0.1 0.1 0.1 0.14 o% g* o( Y( a6 y7 ?* X2 J
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37! r9 J6 V5 w/ q& L. I
Char, Arctic 5 0.09 0.10 0.05 0.05( m9 W5 ]- S- O6 T7 M" r y
Clam (various species) 40 0.03 0.01 0 0.085 e _* L' {; T7 t4 I2 v8 D
Cockle, Greenland 1 0.05 0.05 0.05 0.058 G/ X+ t/ C( B- P( n7 e, C& j
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28- \4 f7 x# ]8 t* [& Z
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
$ Q. [* p3 R9 O7 Q: `! k) DCrawfish 1 0.1 0.1 0.1 0.12 [$ S. g& N' l+ d
Drum, Freshwater 2 0.22 0.22 0.03 0.4
2 q) L) z; h. l2 G& S& @+ TEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76/ s, {+ y+ n/ S0 y; S! U6 W
Eel (species not specified) 107 0.24 0.16 0.01 1.703 n1 F' d7 y x; N- r. v
Flounder (various species) 22 0.06 0.06 0.03 0.12
! x* X: {1 x5 K6 _" Y2 y: E0 lHaddock 3 0.05 0.05 0.03 0.07 |
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