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Human Health Risk Assessment of Mercury in Fish March 2007
+ ]. r% K( [/ d6 c1 r8 mand Health Benefits of Fish Consumption
# |$ O+ [2 t* F9 j2 ?6 n6 dWith respect to the types of mercury found in fish, both inorganic and organic mercury may be, A* m- X- q3 F8 X% @8 Y; ~. H/ m2 c! u
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
4 G' k2 o& H" }& u. ~properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the3 `8 V6 s* O! W1 j
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury; F0 h3 `' N: s X- ^
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
' ` r+ w8 _0 j5 |/ R4 O& x, k5 ehigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other1 |2 r8 V* r$ f% ]9 L. z( Y
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
0 i$ A& T; p1 X9 w y4 @; z/ qlesser extent than methyl mercury.
/ e8 w5 h0 d" N9 T2 {/ f+ eAPPENDIX I
$ l& I: B& G8 M8 s# i1 ~Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
+ J/ D8 @5 A- T$ _! n' P(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
8 h( r* m5 X, @: U; I/ G0 |& p6 XSamples were collected at the importers= or at domestic processing plants during the periods April 1,
- p. m/ G% a9 ]! X) q& z2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A7 F9 l F) O! O& D3 h/ D4 P
concentration of zero indicates that mercury was not detected above the analytical detection limit.
3 B! c' g+ r4 x- x; wTotal Mercury Concentration
+ W; v# E; S& w8 X(ppm)
+ n8 S, {* s8 a* s, p) TSpecies
5 D8 q% P% P) J" G2 xNo. of- h2 X n0 }$ O
samples P9 \# |4 w4 ]! w
(N) Mean Median Min Max8 J# Y6 h6 ?4 o. y
Amberjacks 3 0.17 0.14 0.11 0.27* | P) U3 j# k
Barracouta 1 0.06 0.06 0.06 0.06- |# b* f+ e- m( m5 {
Basa 5 0.02 0.02 0.02 0.022 r0 E/ e, }6 ]% \/ F4 G) j: o& |
Bullhead, Brown 2 0.09 0.09 0.07 0.1+ S2 V. c( M# F. E9 o4 c8 l! O1 A
Capelin 4 0.02 0.02 0 0.05
( w+ m: e# A+ mCarp 1 0.1 0.1 0.1 0.1. e4 d- r' ~' t6 s1 [( M
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
1 u! ]. R8 y+ G! CChar, Arctic 5 0.09 0.10 0.05 0.05* P0 m7 B- w; e, w9 g5 C9 I* s
Clam (various species) 40 0.03 0.01 0 0.08
4 K& ? n; C2 x& ~+ m$ }Cockle, Greenland 1 0.05 0.05 0.05 0.05" Y8 e" p1 \" w! }
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28: O# h8 ?, G6 J3 w0 B6 W" l) Q) m
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
+ n% t' l' N0 y2 {Crawfish 1 0.1 0.1 0.1 0.14 K9 |" _7 U" m( Q" s
Drum, Freshwater 2 0.22 0.22 0.03 0.4
% e6 I$ A _2 N0 L( eEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
: t: R6 y" c( |) k D- C' hEel (species not specified) 107 0.24 0.16 0.01 1.701 s# l+ i, F" m$ `- i0 g/ Y
Flounder (various species) 22 0.06 0.06 0.03 0.12
1 v* W& C: ]2 j6 b/ [6 v1 T! YHaddock 3 0.05 0.05 0.03 0.07 |
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