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Human Health Risk Assessment of Mercury in Fish March 2007
& r$ r" i/ L& s) vand Health Benefits of Fish Consumption
2 k8 T1 B7 d/ \5 L& NWith respect to the types of mercury found in fish, both inorganic and organic mercury may be: t I# i0 x8 t( z6 c# ?+ O
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical: q& Z( U$ A% Q# F& L2 f" a
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
. O1 l) g; w! J( w4 R" |9 yproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury' L4 I3 D6 @$ b2 b
level increasing with age of the fish. In turn, bio magnification along the food chain leads to$ F( P) R+ w6 d d& |% M/ y' m
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other7 B1 q- P- @0 |8 f& ^! N$ @ Q
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
r6 A% A" |; d! R- }" Hlesser extent than methyl mercury.
( t8 y7 X w, R# hAPPENDIX I0 P' F4 Q$ S, Q& t1 _" I
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency& u8 U0 o, Z S
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.9 |+ U- K+ B G7 \! F5 I* |) c
Samples were collected at the importers= or at domestic processing plants during the periods April 1," n8 p8 ~. C5 F* [, T+ t6 ?* u! M5 [
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A% c( `8 Y( z: C3 k- L; R5 X r
concentration of zero indicates that mercury was not detected above the analytical detection limit.
* d7 ]4 z8 K5 ^2 ETotal Mercury Concentration
; h& p) M1 e$ ?, m2 V" O- @(ppm)' _% X$ x# K1 ^& v9 [" C
Species+ {" {- x& ?9 J A
No. of
! ^ C* q5 E& U b3 |) E! N% S: dsamples' }) H( b+ y9 f% y" G* S8 c; e: k
(N) Mean Median Min Max
" g5 F! @" B* _2 [- FAmberjacks 3 0.17 0.14 0.11 0.27
* {5 d$ H/ a5 H( B' L! Q; g0 T* eBarracouta 1 0.06 0.06 0.06 0.067 B2 M, a) S5 t ?) K
Basa 5 0.02 0.02 0.02 0.02
( g6 k7 o* r5 j7 Z8 gBullhead, Brown 2 0.09 0.09 0.07 0.12 s( J' W" T( _) [
Capelin 4 0.02 0.02 0 0.05 _2 a! a' m/ V0 z: p! s
Carp 1 0.1 0.1 0.1 0.1
8 @7 f% C: \" q/ w: P) ^Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
1 M5 J7 w, X/ n, _3 `Char, Arctic 5 0.09 0.10 0.05 0.05
1 r9 N- I9 f: T6 _, MClam (various species) 40 0.03 0.01 0 0.08 i8 Q; w) Y6 t2 P1 P
Cockle, Greenland 1 0.05 0.05 0.05 0.05
" h/ D4 i A4 O6 X, U; L/ R$ }! kCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
3 B. q6 W6 W( S6 J9 j& ZCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
& | u0 ~8 |/ S1 [Crawfish 1 0.1 0.1 0.1 0.1
5 p$ _) A' {% E/ _. kDrum, Freshwater 2 0.22 0.22 0.03 0.4
$ z6 C$ p4 @! V0 R6 o3 f6 hEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
# O( S% t7 i0 J+ q" \6 lEel (species not specified) 107 0.24 0.16 0.01 1.700 W; i( f( C/ C U8 t) B* ~
Flounder (various species) 22 0.06 0.06 0.03 0.12
7 ~3 Y) ~; G4 D# gHaddock 3 0.05 0.05 0.03 0.07 |
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