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Human Health Risk Assessment of Mercury in Fish March 20073 q$ E, e" P% C% a9 ]+ |
and Health Benefits of Fish Consumption7 P7 J: K$ k8 k. @1 P# r9 p
With respect to the types of mercury found in fish, both inorganic and organic mercury may be/ \( D, \6 N$ O2 I! C
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
$ h/ l8 L- z$ x2 H0 J& iproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the. E7 M0 j* y6 [5 y4 y$ G
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury6 m: i' z9 K3 B; M' i8 w- |/ Q
level increasing with age of the fish. In turn, bio magnification along the food chain leads to$ t8 F2 y; N0 Q) E0 r( v5 ^. [
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other7 ?7 d- v. P" U7 Q! Q0 ]
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
( H' s2 H8 x; r$ P+ G# \7 glesser extent than methyl mercury.% {2 r/ {7 Q D. G8 c2 V( x
APPENDIX I: u1 H) \ ]3 l
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency2 I+ c f9 }# ^* U7 _/ t) \' E
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.4 U' H7 H0 e! _1 [3 ^; [
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
2 z1 b7 J2 G* y2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A4 Y0 i# x1 x) l: @
concentration of zero indicates that mercury was not detected above the analytical detection limit.0 o* ?! ^& r, M/ E0 ^
Total Mercury Concentration% ]2 F* ^1 K% m9 ]3 w3 q
(ppm)- s% z- o7 k1 C* T5 y3 C+ [4 ~( I
Species- ^! }7 ?. E1 e* J6 ]+ Y
No. of
7 ~; b9 {. K- j1 fsamples
& d3 v0 T& o( d3 b' i. t$ o(N) Mean Median Min Max0 Q4 {; D1 h* ?* s3 ]
Amberjacks 3 0.17 0.14 0.11 0.27
2 E- x& ]$ |/ }2 g4 F9 F( ?Barracouta 1 0.06 0.06 0.06 0.06
+ r# b# Q" z: L Q; h3 Z# q OBasa 5 0.02 0.02 0.02 0.026 o9 _7 a% a, e2 B% [( u
Bullhead, Brown 2 0.09 0.09 0.07 0.1' q9 v6 l2 B) D$ E. N L4 |
Capelin 4 0.02 0.02 0 0.057 [; q& S+ v: _+ n2 H/ e* `
Carp 1 0.1 0.1 0.1 0.1
4 w- h* p; v8 `; L. Z# ACatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.372 X; B! l$ o- ?; f6 a
Char, Arctic 5 0.09 0.10 0.05 0.05
: T, u+ p: m: Y( F* gClam (various species) 40 0.03 0.01 0 0.081 [' ^- S7 g; ?
Cockle, Greenland 1 0.05 0.05 0.05 0.057 q( g0 P6 T2 u$ f% l' x: F
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28+ m4 h! x& R6 p2 N5 \0 u! u* H
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
7 u* ]4 ?$ B7 }0 \, I8 zCrawfish 1 0.1 0.1 0.1 0.1; d8 c& u! F. T' E
Drum, Freshwater 2 0.22 0.22 0.03 0.47 v' D6 d; ~$ _9 N3 ?
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
* j: D/ s$ k5 ]6 ]3 P% d# m* I4 ]+ JEel (species not specified) 107 0.24 0.16 0.01 1.70
: O: u( i+ Y+ yFlounder (various species) 22 0.06 0.06 0.03 0.12
% D$ D+ L; b8 D2 q4 a$ `Haddock 3 0.05 0.05 0.03 0.07 |
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