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Human Health Risk Assessment of Mercury in Fish March 2007, B( d$ }0 l6 i/ N
and Health Benefits of Fish Consumption
* }* h: X* A, n. ?! d9 J# _With respect to the types of mercury found in fish, both inorganic and organic mercury may be' m% t- L( o* q# n5 W( h4 \
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
1 m/ ]$ W* r9 j2 d4 x1 Vproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
) m5 X- g3 b2 m; D' b; Qproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
' m8 Z: \3 o9 ~* {level increasing with age of the fish. In turn, bio magnification along the food chain leads to
7 v+ [6 u3 h+ g6 ahigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
; r/ T* V, L/ Z/ Yorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far* u( L5 n0 l( r0 X% I# u$ ~
lesser extent than methyl mercury.
1 D4 w; V: d1 n" x1 F1 r( SAPPENDIX I
Z; |* J% |3 z m) JSummary data for those samples of fish that were found by the Canadian Food Inspection Agency. W2 V, c* M" D6 U# _
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.) b" E( L/ q& m$ G9 c
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
" k) t" P$ U- D; U! k8 _. t2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
9 J$ }- x2 g# B, r# ]$ w% wconcentration of zero indicates that mercury was not detected above the analytical detection limit. w- O$ Y: D+ _, c$ k
Total Mercury Concentration1 V' n9 D$ ]+ ~* {
(ppm)
3 u4 O7 t/ s: K3 r/ Y" d! M) X6 @Species, M, l% Q! g$ a' \* J5 ^: M
No. of
6 X) t5 C( j3 b# ~& p0 U# X1 L+ |samples$ ?/ b3 ?1 V# y
(N) Mean Median Min Max5 l5 P( S) |$ Z" n! L& w/ J' }: |
Amberjacks 3 0.17 0.14 0.11 0.272 j+ \" l: c+ T+ n
Barracouta 1 0.06 0.06 0.06 0.067 P# Z# e) z$ E! m
Basa 5 0.02 0.02 0.02 0.02+ s, P& Y# G; [ e0 f
Bullhead, Brown 2 0.09 0.09 0.07 0.1% ^" H6 ~- ^1 l3 e K/ Y
Capelin 4 0.02 0.02 0 0.05
, [' Y. M# g5 r- dCarp 1 0.1 0.1 0.1 0.1
9 a8 F( o+ M# w$ ?Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37# H& ^* R0 A1 L& v- x* R( g
Char, Arctic 5 0.09 0.10 0.05 0.05
9 x" r1 i) H5 e9 ]+ b; bClam (various species) 40 0.03 0.01 0 0.08 m u' Y' B- {$ A& \ e
Cockle, Greenland 1 0.05 0.05 0.05 0.05) F0 M* `# ^5 _4 }7 g8 P
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
9 H4 E2 ~& ^9 n7 ICrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37$ f! y& ~2 k# E7 x
Crawfish 1 0.1 0.1 0.1 0.1
: d2 T) ?. U1 e6 j# ?Drum, Freshwater 2 0.22 0.22 0.03 0.4
( m$ U5 e6 B. {8 ^+ [2 {, uEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76! c8 m+ F+ i; Q
Eel (species not specified) 107 0.24 0.16 0.01 1.70& f1 I. S7 q/ Z# Y
Flounder (various species) 22 0.06 0.06 0.03 0.12
, V$ ]( ~$ c% {; j6 ^# QHaddock 3 0.05 0.05 0.03 0.07 |
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