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Human Health Risk Assessment of Mercury in Fish March 2007
; u6 j9 U) H! g; Y0 cand Health Benefits of Fish Consumption
! K2 j2 H6 I9 R% Y0 e+ Q, ^: qWith respect to the types of mercury found in fish, both inorganic and organic mercury may be3 K; n. V$ o+ n2 u
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
8 C* E$ ]* p; y* K: y+ yproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
L) {' q9 c7 G+ F$ H& n1 Xproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
5 K+ O4 W4 A7 h' K; Olevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
( k0 w2 m2 N" l: T0 khigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
+ h0 Q6 V$ S3 F0 ?- F( S& Xorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
2 t% Y' Q* k+ Elesser extent than methyl mercury.. w# e3 z- T/ f4 r# f* l) W" I
APPENDIX I
5 i( H5 n6 B3 Y; Q- V. zSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
. m* l9 H' M# l2 i) }5 j4 b6 B5 E5 Y(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
6 c% b3 F4 v& `Samples were collected at the importers= or at domestic processing plants during the periods April 1,
5 B% H$ O5 W- Y7 t2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
! T; v) E8 E, \% q6 [3 W# Vconcentration of zero indicates that mercury was not detected above the analytical detection limit.
; Y1 j! n9 r/ L$ N7 T/ [# {Total Mercury Concentration: X. m; m h4 y' i% M1 D
(ppm)
, V) u7 z% j! P# E& V4 \Species
: R+ |7 k, Q8 e2 zNo. of, H- j& E) n+ p f9 l
samples
3 _3 l$ Q1 `8 r5 C7 q7 ^- l2 f(N) Mean Median Min Max( D, Y( m& h# ~& ^
Amberjacks 3 0.17 0.14 0.11 0.271 O8 p) e) i# y4 w g
Barracouta 1 0.06 0.06 0.06 0.06
: t& }9 N# }, G$ w5 pBasa 5 0.02 0.02 0.02 0.02
. x# Y" a+ n5 Y& oBullhead, Brown 2 0.09 0.09 0.07 0.1
0 |2 c& O" g1 t2 BCapelin 4 0.02 0.02 0 0.051 G/ a9 i* y: A. Z! q: B
Carp 1 0.1 0.1 0.1 0.14 T6 o! r1 V% A7 {; f
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37$ o/ V2 ~/ C8 J7 F& B/ d
Char, Arctic 5 0.09 0.10 0.05 0.05
. Y# R3 r h/ @! n! c$ e% e t3 NClam (various species) 40 0.03 0.01 0 0.08
, s& a6 K; D8 L, dCockle, Greenland 1 0.05 0.05 0.05 0.05& y9 p( [' |5 T* o+ c& s
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
5 s% m! a! U8 m/ b+ pCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
9 i2 H( B3 c: fCrawfish 1 0.1 0.1 0.1 0.1/ U5 b& I" J H% X# C' X6 g
Drum, Freshwater 2 0.22 0.22 0.03 0.4
6 f6 i% G ^4 `+ w l6 jEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
( @( Z( x8 v2 Y% k* I4 \1 GEel (species not specified) 107 0.24 0.16 0.01 1.70% ^4 Z+ ~1 J( X# Y# \
Flounder (various species) 22 0.06 0.06 0.03 0.129 v5 x& W6 |( w3 s. c, x# R7 T$ A% A
Haddock 3 0.05 0.05 0.03 0.07 |
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