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Human Health Risk Assessment of Mercury in Fish March 2007& c0 a5 @! P; L9 {
and Health Benefits of Fish Consumption1 w, I3 R! C( e
With respect to the types of mercury found in fish, both inorganic and organic mercury may be3 }% t$ z9 F! f5 w! L$ w
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
* B# J& Y. I+ `* \) P! M- E1 wproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
) ~$ c! _: m: p. k- t8 n6 uproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury- ?, {2 ]& [0 T
level increasing with age of the fish. In turn, bio magnification along the food chain leads to$ E4 F8 x) C) {& ]& h6 f/ x
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
3 D7 u0 Z# F; W* H0 S8 borganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far5 u) f* u& X7 I% }; J
lesser extent than methyl mercury.
- C+ E; n! |( w8 b: D8 q, _APPENDIX I+ d% I6 p. ?0 B2 G3 J f7 A
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency, K; |, a: y* c3 s d
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.3 z5 j$ ?5 {3 A5 | e) X
Samples were collected at the importers= or at domestic processing plants during the periods April 1,( E v( H( A) n$ o& [% t6 W, Q3 Q
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
! t5 L8 j5 E; Econcentration of zero indicates that mercury was not detected above the analytical detection limit.* z6 d( N! a! U% [2 I
Total Mercury Concentration
9 {, Y4 E3 ?6 n$ s3 ^(ppm)) F6 O r4 s, O: L7 }; H
Species
, g% r5 {& Q1 P/ FNo. of9 w6 \5 m+ V* p% s) p
samples
- c, i1 O; A8 H' m' k(N) Mean Median Min Max: X8 @" @$ g. A% ?" w F
Amberjacks 3 0.17 0.14 0.11 0.27
6 I s% ~+ m2 eBarracouta 1 0.06 0.06 0.06 0.06: }, z }) w1 P' c
Basa 5 0.02 0.02 0.02 0.02
6 j! f2 m' @7 K# a: ]Bullhead, Brown 2 0.09 0.09 0.07 0.1
L v$ t; [ d7 i1 J7 P7 S1 S: BCapelin 4 0.02 0.02 0 0.05! k/ ~3 M* c4 p# P4 k* _
Carp 1 0.1 0.1 0.1 0.1+ V( j1 \3 T3 L8 h; f- v" I
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.375 Z9 G+ {9 o; M4 d) o9 ?
Char, Arctic 5 0.09 0.10 0.05 0.05
* z5 u% b8 ]% q4 o9 P9 iClam (various species) 40 0.03 0.01 0 0.08$ k/ T. |4 o9 b
Cockle, Greenland 1 0.05 0.05 0.05 0.052 W* v& S5 D% z) i( }% b
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
$ |+ z& `& Z: p5 Y6 B% ZCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
' t7 S0 v" f# [Crawfish 1 0.1 0.1 0.1 0.1
; e7 K& t! h9 C# {Drum, Freshwater 2 0.22 0.22 0.03 0.4( p9 H5 C4 B; m4 S8 G
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
+ V6 q) h) S$ M6 W; P4 G2 `9 DEel (species not specified) 107 0.24 0.16 0.01 1.70
9 |0 ]& z; r q4 E- RFlounder (various species) 22 0.06 0.06 0.03 0.12( {- w+ q3 y, W5 ?3 D+ R
Haddock 3 0.05 0.05 0.03 0.07 |
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