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Human Health Risk Assessment of Mercury in Fish March 2007- m; \ W. J2 C$ j. J' w+ H; h% O: K
and Health Benefits of Fish Consumption
7 b |9 Y3 L8 C1 wWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
6 T/ A: X7 q( J+ O4 k$ T0 `present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
9 R. f- f% h: p( h4 _; R3 zproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
/ h' k6 m4 z) V4 q9 P* R5 d# [proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury# B0 ~; @/ I7 s# w& U4 @8 v
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
% V. b: r4 I9 a A; K7 R8 t+ f7 Ohigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
0 _' @$ ^; D9 `/ F* ^organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
; w7 _6 O$ l* }. j* M0 [lesser extent than methyl mercury.
- v7 V2 ]- D! }, d5 C" B C) tAPPENDIX I
7 X/ c* o! ~' C9 H4 U# Z: I9 L* gSummary data for those samples of fish that were found by the Canadian Food Inspection Agency7 j! N' _* Q( R" D
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.7 M8 ]4 V0 R5 E! T' M# d
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
* N/ r9 J) o2 k( p2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A5 x/ i) `/ @* j
concentration of zero indicates that mercury was not detected above the analytical detection limit.: G6 a; i$ f& K, ~
Total Mercury Concentration9 [8 p& q3 B* I, u% q+ Q: v
(ppm)+ C1 H/ I1 ]; t- R' w6 Z+ Y
Species6 k! b6 o9 C1 ~/ H! A+ P0 p
No. of
$ a* ~$ s9 O9 o- l2 i$ \6 Csamples
: B# N2 J, d$ ~, S, x0 }(N) Mean Median Min Max$ ]6 E% w& c' f7 m5 T$ ?& ~
Amberjacks 3 0.17 0.14 0.11 0.27; w/ b' s% E9 l8 o: N& }! V/ I
Barracouta 1 0.06 0.06 0.06 0.06
+ J! c& @2 [2 D y) ]! E$ a9 bBasa 5 0.02 0.02 0.02 0.02% N8 e7 M/ x/ f9 F' q8 M3 P
Bullhead, Brown 2 0.09 0.09 0.07 0.1
8 K$ B; b r" N! b2 LCapelin 4 0.02 0.02 0 0.05/ x& Y8 N, Y* @: r& p# b, M8 m2 K
Carp 1 0.1 0.1 0.1 0.1! g# T5 F8 i4 `
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
3 i2 {& |3 y' p q* [2 g6 ZChar, Arctic 5 0.09 0.10 0.05 0.05# z) B$ E( f. v0 W* E4 u
Clam (various species) 40 0.03 0.01 0 0.08
& N. K9 Y+ N, W+ f5 ]Cockle, Greenland 1 0.05 0.05 0.05 0.05
# @$ \7 d8 u- j3 b, ?9 XCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
7 N' G* N" m! i: Y! ]Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
2 N+ O9 A Q9 O% J+ d8 p- A( v# WCrawfish 1 0.1 0.1 0.1 0.1
2 _5 O5 Y8 s+ [& EDrum, Freshwater 2 0.22 0.22 0.03 0.45 N9 s! o6 m% f3 ^
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76% O& Z6 h' v2 C$ }4 C4 ^+ r# t0 Q
Eel (species not specified) 107 0.24 0.16 0.01 1.70
) u$ i Y' e0 D% [% O% hFlounder (various species) 22 0.06 0.06 0.03 0.12
& ~& b9 t2 S( _/ p. ZHaddock 3 0.05 0.05 0.03 0.07 |
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