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Human Health Risk Assessment of Mercury in Fish March 2007
( t9 R9 x( y6 x/ ^9 L3 r$ m! xand Health Benefits of Fish Consumption; p* Z* c* K O$ l, Q( [
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
H3 [6 }+ w: e8 I& I: ~present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical4 b5 Y+ C+ h* r, {7 F) A# I" E. X' v
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
; H# _! h( a! u0 W: Wproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
$ ~* z! P$ U# h( y$ {& Mlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to! T; {; |0 t2 P; l# y t/ u
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other4 [. x0 l" @3 g, q3 ?) q4 y8 l' L! `
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
. O- ?1 y6 v$ }, r# D& F# F d: jlesser extent than methyl mercury.+ U9 X9 o) V9 C
APPENDIX I) n& m& h, F& H+ F0 n9 D
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
8 f/ h% Y) h! u7 |" g/ K$ n(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.2 W! ^3 S, U7 p* F0 P" f5 p! e( ]
Samples were collected at the importers= or at domestic processing plants during the periods April 1,2 w" m* G4 Q1 b2 x2 h
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A0 K' l' Y, S) ]- D3 c
concentration of zero indicates that mercury was not detected above the analytical detection limit.
6 O! l/ O4 Z1 H" _Total Mercury Concentration5 K: U9 b8 T2 p7 l6 |9 |- c- R
(ppm)
( L) i% V9 \, M6 B: q/ g nSpecies
8 V1 N. s3 S6 R* O0 @; ~No. of. a1 M' a: v& J: K) r5 N
samples) T" a+ N" u5 t
(N) Mean Median Min Max
; ?3 Y" z$ Q7 Z! I, BAmberjacks 3 0.17 0.14 0.11 0.27
8 E$ A3 X4 I1 B. z6 ]7 s) w1 LBarracouta 1 0.06 0.06 0.06 0.065 U; Y" ^: A9 Z. s- G I; J9 }
Basa 5 0.02 0.02 0.02 0.02
/ _9 H! [% O- V" m: ]. [. vBullhead, Brown 2 0.09 0.09 0.07 0.19 ^% r1 y+ M7 d# N1 U" ~1 J
Capelin 4 0.02 0.02 0 0.05* X1 j G; O6 q" {8 t
Carp 1 0.1 0.1 0.1 0.1( t% l: j- L. {- _# T& V9 ]
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37: k3 {8 o/ ~: D: P7 n
Char, Arctic 5 0.09 0.10 0.05 0.05
, R9 d3 ^+ ^, B8 y E6 k+ sClam (various species) 40 0.03 0.01 0 0.088 D# h2 u. L8 ?) u9 h- ?# _8 S; ~
Cockle, Greenland 1 0.05 0.05 0.05 0.05# ]/ I) D) c, C% p+ w
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
; i' {& g6 d/ DCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37, I! k w4 |5 H: ?$ y6 o5 X
Crawfish 1 0.1 0.1 0.1 0.1# M9 S( p _" t, E1 G
Drum, Freshwater 2 0.22 0.22 0.03 0.46 Z* y2 m4 s4 ?/ c: ]
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
# ^4 z# m8 e* m' Y9 I9 ZEel (species not specified) 107 0.24 0.16 0.01 1.70
1 m9 m9 h4 @( Y1 U1 _" NFlounder (various species) 22 0.06 0.06 0.03 0.12
9 l& `4 f; ?* k" U$ J1 {# r! WHaddock 3 0.05 0.05 0.03 0.07 |
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