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Human Health Risk Assessment of Mercury in Fish March 2007& m- ] `' E4 b# Q
and Health Benefits of Fish Consumption
, r5 P( J Z3 n* k0 _With respect to the types of mercury found in fish, both inorganic and organic mercury may be' u2 P% y& T" G$ L- m
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical5 l7 _) y" S0 E, K/ \
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
, m* w) ]" X4 S* n7 pproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
: j+ l! y1 r" l- N# k% plevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
+ S/ F$ k% a& vhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other; M9 |4 I8 t2 J- L
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
" F. V: P, }0 R' Z9 D" T5 @8 v( ulesser extent than methyl mercury.
! Z% ^: x" A! T5 a# P. S, F5 DAPPENDIX I
5 D6 N) }# V b, l; W$ DSummary data for those samples of fish that were found by the Canadian Food Inspection Agency2 \; C$ ~; w0 Q5 \) Q; v! x; S% c
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury., e9 _/ p( `* Q$ A3 v8 I
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
% ?) H7 X6 b! a( ~2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
/ O- k) F+ L( X$ G, yconcentration of zero indicates that mercury was not detected above the analytical detection limit.- S! L, l& x3 S9 g {, y$ T
Total Mercury Concentration0 ?" w' q6 ?% v- s0 [& y
(ppm)* y/ W/ o# e5 t& I% O) F' U
Species
+ j: B O( g% I3 t! h7 F" z6 yNo. of
, ?, H$ d. F6 Z% L. U8 E# o9 z' |samples
% @; B7 s& i$ x8 K. Z! t(N) Mean Median Min Max
) h. c4 c5 g- m6 o4 ~- @+ {& VAmberjacks 3 0.17 0.14 0.11 0.27
1 N+ b H/ P& o) w8 x1 a& r Q1 W5 @Barracouta 1 0.06 0.06 0.06 0.06* m" U z& d/ u ] v: ~. S
Basa 5 0.02 0.02 0.02 0.02! I+ p- s$ c$ k. o
Bullhead, Brown 2 0.09 0.09 0.07 0.1
' y8 ^+ k$ k! z$ ]Capelin 4 0.02 0.02 0 0.05- l: O) N5 X1 i0 T# S& X( e/ y
Carp 1 0.1 0.1 0.1 0.11 v: }( \1 |8 s* q2 u6 L
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
% ]( {3 ~1 H: QChar, Arctic 5 0.09 0.10 0.05 0.05
* j; z/ i9 p; l* _& YClam (various species) 40 0.03 0.01 0 0.08
, [* y8 q2 S3 S. ~2 j |Cockle, Greenland 1 0.05 0.05 0.05 0.055 Q2 r( T! W, W/ A3 L2 d6 V- A/ C
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28' ]0 o8 ~% K6 z
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
8 f6 Y G" s- d& RCrawfish 1 0.1 0.1 0.1 0.10 D; R1 @, K5 N, r) @
Drum, Freshwater 2 0.22 0.22 0.03 0.4 g8 d( c6 {0 \' Z1 j0 ~2 Q( @
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
% R/ k$ ^1 w- M) [! ]3 j. UEel (species not specified) 107 0.24 0.16 0.01 1.704 a! u4 ` k% ^0 N5 F) i1 b) C" S
Flounder (various species) 22 0.06 0.06 0.03 0.12
! v( S% h1 w) A; G" ZHaddock 3 0.05 0.05 0.03 0.07 |
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