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Human Health Risk Assessment of Mercury in Fish March 20078 U6 C. T6 z& v( \
and Health Benefits of Fish Consumption
: E) p% p% ~$ }! s) H }, vWith respect to the types of mercury found in fish, both inorganic and organic mercury may be8 o, ^4 R% v: U5 \& Z- B7 _* E
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
4 M' V& o4 U' {6 n: @4 U3 B+ H! Pproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the& I# d- I2 W5 D6 J. I4 g$ u
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury0 L: q* k! E9 u( V* b' N
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
" ]3 {* s$ J' _3 b6 K6 Mhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other: t! Q6 ^2 K/ l7 U2 `
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
$ E" G# [& p2 \% mlesser extent than methyl mercury.6 C D( R$ N0 _9 ]; z
APPENDIX I
4 J. e+ l% [! X+ eSummary data for those samples of fish that were found by the Canadian Food Inspection Agency" O' q: Q1 _' M
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.. M0 x4 \9 ~: G6 K Z! g6 w! Z
Samples were collected at the importers= or at domestic processing plants during the periods April 1,, }+ X! Y1 s- ~- j: t
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
4 L' D+ d* i- H1 mconcentration of zero indicates that mercury was not detected above the analytical detection limit.
/ t; i$ a" `" D3 ~1 V3 u; KTotal Mercury Concentration
/ @" d& [2 k8 w5 i(ppm)6 @% A5 z4 } m7 M W# X
Species
& p' z5 ]9 ], V p' aNo. of' o/ U9 ], e! X
samples9 ]* ?- C3 M# R* @( m9 z8 E
(N) Mean Median Min Max; c8 j- v- m: p; L* G) K
Amberjacks 3 0.17 0.14 0.11 0.27
: t5 Z, a; n* P) ~3 Z5 OBarracouta 1 0.06 0.06 0.06 0.06
) F% O" s u4 aBasa 5 0.02 0.02 0.02 0.024 ~6 d! ]0 w" K
Bullhead, Brown 2 0.09 0.09 0.07 0.1
8 q, K6 I8 A1 ]" A6 {Capelin 4 0.02 0.02 0 0.05
* H. N& j- r- x4 I7 [/ j. V( ^0 NCarp 1 0.1 0.1 0.1 0.1
3 d9 \. p; ?0 x" G5 x3 ECatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
5 D& p, x* f1 q7 }Char, Arctic 5 0.09 0.10 0.05 0.05
; K$ p0 `; P$ d5 K' n- H" j( ]# h( jClam (various species) 40 0.03 0.01 0 0.08
Y% ~5 B: v$ Z/ U5 D, X' }Cockle, Greenland 1 0.05 0.05 0.05 0.05
* Q2 ~. Q& y: ^* kCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28; e/ K. ^4 |7 ?; Z
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.373 ~0 K, d7 Q* R0 k l/ @. q6 M
Crawfish 1 0.1 0.1 0.1 0.1
% S* p6 c+ q" NDrum, Freshwater 2 0.22 0.22 0.03 0.4
; o4 }, O0 n) ]9 yEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
! K1 ]. C$ C- h) w8 ?7 d! `Eel (species not specified) 107 0.24 0.16 0.01 1.70) c! ^& P- x% s( O, t8 }
Flounder (various species) 22 0.06 0.06 0.03 0.12% X- s+ s2 {# b6 O$ J9 W" M
Haddock 3 0.05 0.05 0.03 0.07 |
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