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Human Health Risk Assessment of Mercury in Fish March 20076 P6 V4 n/ J! V) F% D$ e
and Health Benefits of Fish Consumption
8 u' i" V3 I+ r5 T% ^With respect to the types of mercury found in fish, both inorganic and organic mercury may be$ B- z. T' B" L/ N1 h
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
6 f m6 G! L! c. D; qproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
- B7 c: f7 @+ r4 Pproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
( u2 o9 h6 t' O% m/ F) t, slevel increasing with age of the fish. In turn, bio magnification along the food chain leads to( b3 j q8 f( V3 ^- B! `
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
8 @- j- Q* s: p# `9 Uorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far% G3 Q4 R4 D. ?
lesser extent than methyl mercury.8 B' b4 x0 m3 X
APPENDIX I
7 f% }! }. M7 v! S& B4 [Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
! W' I7 N$ ~* ]0 O(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
9 }6 ]5 U) ?9 r; XSamples were collected at the importers= or at domestic processing plants during the periods April 1,
/ n" Y/ }# d2 z, T4 r- p+ ^! d2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
k9 X1 @* n! x) a. }. g5 G# `; `concentration of zero indicates that mercury was not detected above the analytical detection limit." ^7 d5 j# Q$ v9 E
Total Mercury Concentration% h7 f3 E$ M5 y0 d' _
(ppm)
$ C. ]" q- x1 r5 X2 g' _# MSpecies' C2 h. Q$ o" Y% L6 [* D
No. of( J, T, f. G2 o
samples
2 N4 b! i5 g7 j3 i5 \! |- P. `(N) Mean Median Min Max0 j3 I; |- }4 C: V7 r" Z# v/ l' V
Amberjacks 3 0.17 0.14 0.11 0.27- i: F7 g( B! v! U7 d
Barracouta 1 0.06 0.06 0.06 0.06# G; Q) c. t, j0 \
Basa 5 0.02 0.02 0.02 0.02
% n6 m6 V- A4 y0 g( Z& |! Q; hBullhead, Brown 2 0.09 0.09 0.07 0.1% Z; w* Y1 p2 K5 `, K
Capelin 4 0.02 0.02 0 0.05# E/ X4 k+ ^0 r1 I" v- ?
Carp 1 0.1 0.1 0.1 0.1- b! H6 W8 A' P7 A7 R' A, W
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
! @4 m7 i( V; F. k: g3 _# E1 OChar, Arctic 5 0.09 0.10 0.05 0.058 N* {- A2 G% Y! ?4 }1 c) }* s$ \5 p
Clam (various species) 40 0.03 0.01 0 0.08
0 I6 ~2 B" U+ ~$ |8 ` ECockle, Greenland 1 0.05 0.05 0.05 0.055 O9 H+ I9 A; w7 G" ?: O) I
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.286 L7 d9 O% |# n# I! S; [
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
5 e) d8 x- V+ R1 S8 y) q3 K& s2 G1 ^/ {Crawfish 1 0.1 0.1 0.1 0.1
1 Y& V u5 i1 }& aDrum, Freshwater 2 0.22 0.22 0.03 0.4- u2 I8 h9 j; K2 M$ z1 N4 c+ m
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
6 y5 n6 o% W! K* r6 KEel (species not specified) 107 0.24 0.16 0.01 1.707 |. p* w; M! X6 a
Flounder (various species) 22 0.06 0.06 0.03 0.12
, F: |( e2 D0 A9 B- a1 z3 eHaddock 3 0.05 0.05 0.03 0.07 |
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