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Human Health Risk Assessment of Mercury in Fish March 2007
_# k1 {% p. c9 Oand Health Benefits of Fish Consumption
- d( m/ |4 T! O/ @, T- W# _With respect to the types of mercury found in fish, both inorganic and organic mercury may be
$ |9 }, x, f2 l0 f D9 B# _present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
8 f( H( d; s4 J$ dproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the, ]$ ^( w% ]! \8 [# O `
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
A& T0 h: N+ o1 G7 Mlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
) v* I0 O; ]$ Q& y, {higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
8 x8 I1 K3 t! morganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far- }7 B9 j2 _6 E
lesser extent than methyl mercury.
0 T: s: v' M# V! |9 zAPPENDIX I
2 N* I! s! d8 b s$ w6 t: MSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
) D, X* M# i) K* j(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.7 q4 Q% Q7 g7 P7 s+ O: I$ B, |
Samples were collected at the importers= or at domestic processing plants during the periods April 1,+ z2 B6 d3 |6 ^1 J F2 k/ C. z
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
; h; g5 r$ } rconcentration of zero indicates that mercury was not detected above the analytical detection limit.
1 q1 P6 I' k5 T6 l4 K( zTotal Mercury Concentration0 d; O. }; `7 l4 [: c
(ppm)( Y! S/ C: j5 A' o5 u7 K# q, k) Z
Species; W$ |/ l8 P% p0 P
No. of
3 V( T- |9 Q( F! [9 |/ \samples
( K+ Y0 h3 U i4 K& a(N) Mean Median Min Max- M* y: J* W: ~$ k4 @, e
Amberjacks 3 0.17 0.14 0.11 0.27* ~* a; v% x. a% A+ F, n
Barracouta 1 0.06 0.06 0.06 0.06
1 K( O) A# X7 r! f8 e: H' F: KBasa 5 0.02 0.02 0.02 0.02 L: ]* h1 ~5 I: a" c
Bullhead, Brown 2 0.09 0.09 0.07 0.1) m* B9 ?& @9 Y) u' C; n
Capelin 4 0.02 0.02 0 0.05/ ~2 }4 ~7 U! z8 V
Carp 1 0.1 0.1 0.1 0.1' k4 G4 y5 H8 ^* u
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
; z1 m+ i% N% Q2 n5 Z9 YChar, Arctic 5 0.09 0.10 0.05 0.05" P4 x1 o( N0 v& s9 B0 w7 {2 Z
Clam (various species) 40 0.03 0.01 0 0.08: g5 j1 C$ v3 d1 T( U6 T+ X
Cockle, Greenland 1 0.05 0.05 0.05 0.05
: ]9 \* ^; g$ M j4 o! s" W2 u wCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
. h; |8 P4 a( Q" X8 q: v4 E# lCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
1 ]6 x- D) m0 C' }Crawfish 1 0.1 0.1 0.1 0.1
! k* ^4 v0 M* w; q7 q4 U, KDrum, Freshwater 2 0.22 0.22 0.03 0.44 J7 i/ W2 S3 j9 ^+ N; p
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
$ }! b$ r9 Y7 j5 b2 T% e: A) kEel (species not specified) 107 0.24 0.16 0.01 1.709 j0 j3 g2 Q6 v: u$ Y: O
Flounder (various species) 22 0.06 0.06 0.03 0.12
1 g8 t9 Z0 H9 R) {; I; [ u$ B+ }; }. zHaddock 3 0.05 0.05 0.03 0.07 |
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