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Human Health Risk Assessment of Mercury in Fish March 2007- D5 \. ~6 }2 x# r. \$ _1 T
and Health Benefits of Fish Consumption5 t/ i% W* f" l
With respect to the types of mercury found in fish, both inorganic and organic mercury may be+ a, c9 q1 L# d% u' Z) `
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical1 m5 p8 E9 t2 e2 ~9 a5 r( e% C
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
. X4 p+ M+ j) T7 v$ W- Mproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
' V: y) r. B; D) Ylevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
) T A3 c$ M& |) B* L5 N/ jhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
, C1 \' P. R, m3 Morganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far: L9 }% X7 S& R. g
lesser extent than methyl mercury.
k7 p/ n$ j0 T: OAPPENDIX I" U2 W4 U) T0 \; }
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
3 W, f7 t! L) ?: }4 d( E(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
( W. a) h C( W/ s) J5 A$ lSamples were collected at the importers= or at domestic processing plants during the periods April 1,, O0 F7 w2 [0 K" t0 n& m f ]) B
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A- p# w' V: C- P% _# P( w
concentration of zero indicates that mercury was not detected above the analytical detection limit.
$ ]' Q+ M1 Y% V. ]8 @Total Mercury Concentration
1 n" d/ o) N# c$ I6 y' L(ppm)
; _- j' u* v/ d" qSpecies( [7 j' ?3 u) M& \0 J
No. of: F$ ]0 u4 n) ` o& q' k7 {
samples
8 a6 A- A0 J& |' r7 v(N) Mean Median Min Max
2 @$ H6 _. E( y7 |; pAmberjacks 3 0.17 0.14 0.11 0.27
0 a) S/ n" ~- FBarracouta 1 0.06 0.06 0.06 0.06
% s' K- \' A% \7 O6 ]9 ]Basa 5 0.02 0.02 0.02 0.02
/ {* r% U C P# @* ~2 QBullhead, Brown 2 0.09 0.09 0.07 0.1& D' w1 I7 Q+ M. R' v
Capelin 4 0.02 0.02 0 0.05- y& W" O5 a4 ^* }: r7 m
Carp 1 0.1 0.1 0.1 0.1* J! f3 e' y3 b, b$ w' x# H$ i: w
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
( d$ h) ?: G: c! IChar, Arctic 5 0.09 0.10 0.05 0.05
! I9 v: {: j2 q/ P$ p+ }! GClam (various species) 40 0.03 0.01 0 0.08
! R- J; s4 @6 J1 w5 o! d# lCockle, Greenland 1 0.05 0.05 0.05 0.05
7 \0 t% k$ Z. K K" v! E, oCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
! E' a% f! n3 U! L, _, bCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37! f: r/ a# m7 h! M, {
Crawfish 1 0.1 0.1 0.1 0.1
9 x ^0 n7 r6 T* T$ w% FDrum, Freshwater 2 0.22 0.22 0.03 0.4
; O5 d+ l% Z. U; s$ yEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
9 _, R& {# f' ~$ N" \Eel (species not specified) 107 0.24 0.16 0.01 1.70/ r, G$ M6 t% P$ b2 d. e
Flounder (various species) 22 0.06 0.06 0.03 0.12+ m$ |# V% u* ?1 t' ?4 _9 \
Haddock 3 0.05 0.05 0.03 0.07 |
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