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Human Health Risk Assessment of Mercury in Fish March 2007
9 g! D/ E2 s( T8 j5 }& s: q) Gand Health Benefits of Fish Consumption
& t* X0 a' u8 r: e5 K9 yWith respect to the types of mercury found in fish, both inorganic and organic mercury may be) D$ P3 F6 X8 Q5 X& B+ @
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
5 K! G8 W' e) D7 r% b( j4 rproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
' |; z3 s; I7 Sproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
: m/ z! ]4 {5 P. B* l$ R7 Llevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
7 [- O0 z/ M! e7 ]* a. chigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other9 C* m# Q# f( x1 B# s6 g8 E; e
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far- V$ C0 n1 w, j4 Z* ?
lesser extent than methyl mercury.; T7 G7 @( y) _4 W' N
APPENDIX I& }0 L6 E; d: k8 C
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency* T3 W- ?/ O/ B$ m$ N" J
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
9 z5 l' a. c9 H# _ fSamples were collected at the importers= or at domestic processing plants during the periods April 1,
9 ?( A3 G# T7 F1 @! i( N2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A* S7 }! r7 q" k% X# n
concentration of zero indicates that mercury was not detected above the analytical detection limit.
1 x3 A' j" f! ]( JTotal Mercury Concentration' F# ]$ `4 `: ?; A1 ]( l: O% N
(ppm)! @9 u% z ~( U; u6 h
Species
% d' x) ~# m8 J, s3 T, m" MNo. of
& d3 v2 {% i& S: J; Xsamples( l" P. Z0 [" {( W! V5 z
(N) Mean Median Min Max
" j$ e# ~) z0 C& UAmberjacks 3 0.17 0.14 0.11 0.275 g9 Z7 P, {% z' b
Barracouta 1 0.06 0.06 0.06 0.06# g7 R6 V( {9 p" p+ A- F
Basa 5 0.02 0.02 0.02 0.024 E" ^4 N8 @1 n! j e, R
Bullhead, Brown 2 0.09 0.09 0.07 0.1
8 m$ G1 C1 }% ~- }! ECapelin 4 0.02 0.02 0 0.050 A1 |% b2 s! v
Carp 1 0.1 0.1 0.1 0.1# b" Y2 I. O- K; K9 l
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
# `5 z& u4 R! d4 wChar, Arctic 5 0.09 0.10 0.05 0.05
! G2 b# E" m% h$ gClam (various species) 40 0.03 0.01 0 0.08
: v7 g) G2 P+ R- s9 TCockle, Greenland 1 0.05 0.05 0.05 0.05. q. I: v3 I5 M: t4 n
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28* R$ k3 z3 P: n; H$ `! d
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.372 `& |* _: O2 c, H2 j: l! n
Crawfish 1 0.1 0.1 0.1 0.1$ d- g" H! ]7 a$ M( u r
Drum, Freshwater 2 0.22 0.22 0.03 0.4
. K- S( |, l! e8 z# EEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76% }* U$ b1 M. v8 j, B5 }
Eel (species not specified) 107 0.24 0.16 0.01 1.70
- d4 H8 }. c$ w1 t9 l/ wFlounder (various species) 22 0.06 0.06 0.03 0.12
. t7 Q+ L* A$ f+ ]1 j" mHaddock 3 0.05 0.05 0.03 0.07 |
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