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Human Health Risk Assessment of Mercury in Fish March 2007
: B! c0 B0 E+ Gand Health Benefits of Fish Consumption* J1 A. R; t; _# t7 f
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
* H Z4 ^# b: ~6 @/ n m8 ]8 Jpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
3 e" h G* m- vproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
( R$ U$ u0 k4 \proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury% \$ n3 X; w8 O
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
% q' T- A+ I, n5 f' Y7 H6 W) h+ Khigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other0 p1 A1 A, Q# K) x5 L4 a
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far' o7 N0 w, L# J
lesser extent than methyl mercury.
7 o7 _0 \9 X$ w' d6 Y4 LAPPENDIX I
8 V! d4 U3 _9 t7 iSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
+ \4 o8 x" I: ?, l; u. g(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
6 A/ k( O$ t& e, O. SSamples were collected at the importers= or at domestic processing plants during the periods April 1,
3 f2 H7 ]8 f1 e6 R6 W2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A4 s2 [' p& [, p% M: I% V
concentration of zero indicates that mercury was not detected above the analytical detection limit.! O9 L! l( P2 y& T
Total Mercury Concentration
$ L: C0 G8 v) R: Y+ y(ppm)
$ J' O& [# Z" DSpecies
8 P5 U2 T; `5 ENo. of
p/ l; a, c7 k5 A+ u$ Zsamples
3 }- z6 w+ s; w5 ^, ]4 n+ R8 n(N) Mean Median Min Max
) H. T- V3 H/ p6 WAmberjacks 3 0.17 0.14 0.11 0.27% U# u' Q) w( p" |( u4 t
Barracouta 1 0.06 0.06 0.06 0.06, P; e1 n- X& B- @# q. Q5 q
Basa 5 0.02 0.02 0.02 0.02
! s5 a" s! V m3 J& i6 f7 QBullhead, Brown 2 0.09 0.09 0.07 0.1) y5 \4 I" n. R0 g8 O! @: K
Capelin 4 0.02 0.02 0 0.05/ t9 b7 q) f, z: [( w" h
Carp 1 0.1 0.1 0.1 0.1
( D9 E- |4 a' U0 k# KCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
6 C9 K# M. Y* \# W# y! o, b+ {* JChar, Arctic 5 0.09 0.10 0.05 0.05
0 P/ z9 B) Y( I$ p Q0 U( mClam (various species) 40 0.03 0.01 0 0.08: h+ _1 Q7 ?: r: Y
Cockle, Greenland 1 0.05 0.05 0.05 0.05, i; H3 T& P1 [
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
) _( U! m/ O. m- G8 s* ~Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37# |* W/ s+ x3 u/ k9 i
Crawfish 1 0.1 0.1 0.1 0.11 Y$ ?$ Q+ s' C4 } f
Drum, Freshwater 2 0.22 0.22 0.03 0.46 C5 |% H3 i5 `* H/ z2 U: K, k) `
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
9 p0 ?) c+ e. \, A6 _; yEel (species not specified) 107 0.24 0.16 0.01 1.70
) S1 A6 B& y8 ?Flounder (various species) 22 0.06 0.06 0.03 0.12
# ~ l, X& z; d5 y3 E5 hHaddock 3 0.05 0.05 0.03 0.07 |
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