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Human Health Risk Assessment of Mercury in Fish March 2007
. {* B. r5 _7 y/ e1 a+ Z& t) |and Health Benefits of Fish Consumption
# v, ^+ A" X1 Z+ o, n- E. A l: u( GWith respect to the types of mercury found in fish, both inorganic and organic mercury may be) Q) F1 [ p* ^7 x) X$ x; A- o( p% v3 }
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
1 ?' T' T, \0 h. Dproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
& V$ R% z d% K9 r" L Yproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury7 [( q7 `7 b! e, F* R# F# {8 P. m
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
: B) ?; S# r+ ?) `% x+ Bhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
* X \8 n9 }4 D, Zorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
. S- M" R" h) ?' b: zlesser extent than methyl mercury.% C0 V3 G! c2 C: p% d3 W. [) K
APPENDIX I
/ b# ^, Y6 G# qSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
- w3 y' C: C9 U" p% `) C$ G$ ]+ E(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
/ V# H9 C( i5 C; [9 V# wSamples were collected at the importers= or at domestic processing plants during the periods April 1,
2 ~& @ e9 n5 q2 m5 q5 z. N2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A' E* a8 f |4 ]% c
concentration of zero indicates that mercury was not detected above the analytical detection limit.
$ d3 S$ w% `2 [, ?6 Z4 VTotal Mercury Concentration. u+ ^1 f5 d4 L
(ppm)
- W4 `" F' G, o+ tSpecies
/ }- B0 X0 C M" p# s( m* N- _5 e6 D6 RNo. of
5 S, P8 ?. T3 }" f4 o( n, C5 Qsamples
3 I% u* N1 M' N- Q6 u4 p(N) Mean Median Min Max
* D, m, Z5 E- g6 C" Z" jAmberjacks 3 0.17 0.14 0.11 0.273 q. K6 i4 R- a J
Barracouta 1 0.06 0.06 0.06 0.06( Z# S! O; F3 n7 u3 \6 r# B# s. r
Basa 5 0.02 0.02 0.02 0.020 B& ^# p0 _4 j. x; _! J0 R
Bullhead, Brown 2 0.09 0.09 0.07 0.1' X4 D1 w+ P. y" }7 X2 ^
Capelin 4 0.02 0.02 0 0.05
6 a! H& p0 O6 h* A. `5 qCarp 1 0.1 0.1 0.1 0.1
7 v' P0 p7 `5 O! ~; cCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
- l6 b8 e1 c5 ` M0 M HChar, Arctic 5 0.09 0.10 0.05 0.05% Y5 B/ ?( f; e) h6 q
Clam (various species) 40 0.03 0.01 0 0.080 l/ f1 e$ ?7 _9 ^ `
Cockle, Greenland 1 0.05 0.05 0.05 0.056 {3 C( P f9 Y% L) M8 n2 T
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28: c/ O, r# C* |( T
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
3 D9 D8 [ v9 {6 qCrawfish 1 0.1 0.1 0.1 0.15 X: P4 N3 `- j2 U, ^& g' w
Drum, Freshwater 2 0.22 0.22 0.03 0.4
+ H- _% X+ y* U/ x' M' T9 a5 iEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
2 i6 } Z+ _' ?9 ]5 r/ t8 sEel (species not specified) 107 0.24 0.16 0.01 1.70
3 V/ B. r, Y6 w8 g0 oFlounder (various species) 22 0.06 0.06 0.03 0.12
0 Z6 \* N4 j) r' g: |7 t! aHaddock 3 0.05 0.05 0.03 0.07 |
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