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Human Health Risk Assessment of Mercury in Fish March 2007
3 V0 W! s+ i1 ?: X( J' i( \and Health Benefits of Fish Consumption
* X$ n6 y& Q% D! s7 GWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
& K4 x1 j( [* E" ~6 u! {present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
A7 X3 ]0 V, o# _, J0 j- H1 Qproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
. C, K" u, B# p! e, r/ zproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury L) x# n7 \& X3 |3 X( {! ^
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
# f& ~# j" }. n3 @" ^0 Whigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
) \/ {/ Q# D0 ?+ I Porganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far2 o; q( ?" i% F8 }4 m4 P$ @
lesser extent than methyl mercury.9 C% j0 B' ^9 E0 W- ]
APPENDIX I/ N; Z; w2 m q" R( p" T
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
+ q) Z6 |- G1 r* C* b. a/ o(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.. t F4 n# u h9 M* t3 K0 T
Samples were collected at the importers= or at domestic processing plants during the periods April 1,' s' x) s# R8 c& D: c
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
' d/ u; M! o9 }concentration of zero indicates that mercury was not detected above the analytical detection limit.
: U+ C$ M8 K- J% _( CTotal Mercury Concentration. w1 U3 a" F6 d# d! }# j, C
(ppm)8 f4 L+ @5 R6 |$ j @/ {
Species
' E! M: U) a- [& ~# q0 b" gNo. of
" b5 i; w; H% m7 t" ~- s. n; _4 v! hsamples( b, y1 L8 W0 @
(N) Mean Median Min Max
8 e4 |# U4 ^" q2 z, {Amberjacks 3 0.17 0.14 0.11 0.27( `8 i" X* [8 ]- Y
Barracouta 1 0.06 0.06 0.06 0.06
) E. L$ C' n, k- o. {, kBasa 5 0.02 0.02 0.02 0.02 g% @' e1 N" J1 g7 e
Bullhead, Brown 2 0.09 0.09 0.07 0.1
. c. n, y/ b$ Z- {' @Capelin 4 0.02 0.02 0 0.05
! S0 \% z4 `, L$ [( c+ tCarp 1 0.1 0.1 0.1 0.1
8 _2 @1 T' i$ TCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37( s# _- z. w% V4 w$ \3 x
Char, Arctic 5 0.09 0.10 0.05 0.05
8 R9 h; r* K6 B3 y8 n0 n: o3 I vClam (various species) 40 0.03 0.01 0 0.084 y$ R5 j4 n2 M$ h; K F: M% _2 d
Cockle, Greenland 1 0.05 0.05 0.05 0.05
- d+ T5 w, w/ V2 U4 [0 }Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.282 ?) @9 x1 y4 _: N
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
0 {8 n! v- Q8 V# j; R# [/ jCrawfish 1 0.1 0.1 0.1 0.17 D" u2 I( p. }8 {3 o
Drum, Freshwater 2 0.22 0.22 0.03 0.4- }' l A* Y8 I( {
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.763 h4 x% _4 `; I
Eel (species not specified) 107 0.24 0.16 0.01 1.70: F5 }- q2 s, ~4 I5 T
Flounder (various species) 22 0.06 0.06 0.03 0.12
/ d0 o) Q0 a5 r, A8 l6 J G, r( NHaddock 3 0.05 0.05 0.03 0.07 |
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