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Human Health Risk Assessment of Mercury in Fish March 2007! B% \: P# L8 \% I
and Health Benefits of Fish Consumption
; H# s1 V/ m: d5 Q4 }! LWith respect to the types of mercury found in fish, both inorganic and organic mercury may be( L6 S+ P: e2 u1 _
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical, }6 M: Y' b; ]# v' g4 _7 F+ T4 d% M) h
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the' _% I: @" i' H0 E, j d4 L! A
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury$ O* {8 R# p& O N5 U( ]
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
+ e6 k' I K/ a7 D. _higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
`1 G+ ^, X8 b/ h# Torganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far7 y2 [7 t$ T! m% R; H/ U+ `4 t
lesser extent than methyl mercury.
4 y( i9 T: m& K: YAPPENDIX I
F( U' j. O# U: [Summary data for those samples of fish that were found by the Canadian Food Inspection Agency& O, g; q( l9 O' H
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.9 Q5 O$ n z4 G# W& `9 H' ]
Samples were collected at the importers= or at domestic processing plants during the periods April 1,! {' z) I- |. I( W4 F1 G3 H
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
+ `. q0 y0 A" T" A1 Mconcentration of zero indicates that mercury was not detected above the analytical detection limit.
/ T/ L, a T% _! tTotal Mercury Concentration5 x6 d9 j" X0 r6 v
(ppm)
. V8 J% Z6 N. ^ {3 a1 x. WSpecies; G4 r2 {4 J" w" u& _7 o
No. of
4 b7 o9 e* X' w$ Z8 E2 E& |samples
# l, C$ B! P4 K' ~" e(N) Mean Median Min Max* r, U/ |3 E# ~% m! A% i; j
Amberjacks 3 0.17 0.14 0.11 0.27
) x# f: K4 F3 `Barracouta 1 0.06 0.06 0.06 0.06; e, @4 w M. H. _9 b
Basa 5 0.02 0.02 0.02 0.02
- l) @; g( A8 m/ CBullhead, Brown 2 0.09 0.09 0.07 0.1
- H2 Q! ~- k) ^Capelin 4 0.02 0.02 0 0.05& J- L0 M, `: u7 L9 P0 K: d# V
Carp 1 0.1 0.1 0.1 0.13 e: s0 Y7 v5 Q
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
q0 e1 ^; K6 B$ W% j8 KChar, Arctic 5 0.09 0.10 0.05 0.05
) A% m- I1 p* c4 h+ E; v6 g# H& k9 {Clam (various species) 40 0.03 0.01 0 0.08
0 L( H6 k' W0 @6 r* J* UCockle, Greenland 1 0.05 0.05 0.05 0.05
& H. T$ E6 G+ n9 DCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.285 a4 l% k, K, p
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37. s N0 F+ p+ V( W5 t7 o
Crawfish 1 0.1 0.1 0.1 0.12 j" d) z* W& l3 d+ G+ a( F
Drum, Freshwater 2 0.22 0.22 0.03 0.4
" I, N2 D2 P9 K" kEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76* H; u& C; k2 `( v8 i6 \
Eel (species not specified) 107 0.24 0.16 0.01 1.70
' Z6 P7 a) }" L/ gFlounder (various species) 22 0.06 0.06 0.03 0.12
" t$ Y, v+ T' S( y: UHaddock 3 0.05 0.05 0.03 0.07 |
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