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Human Health Risk Assessment of Mercury in Fish March 2007
9 n4 _& J" I! [$ }and Health Benefits of Fish Consumption
9 n8 B" U" k# MWith respect to the types of mercury found in fish, both inorganic and organic mercury may be# x% ?# ^, X& S, j6 D% q
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
4 ^2 J# B: ^; }! o5 g) Oproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the8 b* t, _" w @& U! y
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury! Y% W6 D8 ~ o3 |' s; P/ H
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
( \) Z, P, a0 T5 x# b$ Y/ P2 r4 fhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
5 e# N. @" s" Jorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
4 G% ?+ i8 o1 I6 _; y' Dlesser extent than methyl mercury.
) e9 W5 R& ?0 WAPPENDIX I
( ]( q6 d. w8 r9 f$ Z( oSummary data for those samples of fish that were found by the Canadian Food Inspection Agency1 ^4 J7 J/ A* L6 Z* \
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.- ^3 @: P5 u2 ]" A# P
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
6 A6 L$ k" Q8 G! T2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
* N4 y: t9 N) ^2 a% n m9 Nconcentration of zero indicates that mercury was not detected above the analytical detection limit.$ f M- S8 ?* }8 L
Total Mercury Concentration; i/ S, J, H5 x* d* K! Z. s6 {/ Q
(ppm); C2 O1 ]+ Q. h! f* C
Species
$ t5 x: f0 l; A7 x3 T6 n. yNo. of
8 V+ _' M4 {/ k+ Csamples4 F' N$ Q! w a5 Z, j9 P4 I
(N) Mean Median Min Max
: F) M1 G/ ~/ r0 }$ PAmberjacks 3 0.17 0.14 0.11 0.278 |2 M: b$ Z& f" q8 o: \" J6 H
Barracouta 1 0.06 0.06 0.06 0.06
) z/ r, t$ M8 m+ }& J7 d3 ABasa 5 0.02 0.02 0.02 0.022 Y! w% U4 P! h
Bullhead, Brown 2 0.09 0.09 0.07 0.18 P- q3 B0 u9 S3 G0 A) j
Capelin 4 0.02 0.02 0 0.05
) U, g, ]9 U! s7 h# `7 iCarp 1 0.1 0.1 0.1 0.1
! f* S( _/ y8 l7 RCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
2 C& u3 ~! r- D' KChar, Arctic 5 0.09 0.10 0.05 0.05
7 B; s6 z& s2 M6 b+ jClam (various species) 40 0.03 0.01 0 0.08
" j V& f+ C& G; cCockle, Greenland 1 0.05 0.05 0.05 0.05, G) j6 c' n3 H, t
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.288 Q9 A! [( S3 f; O* b2 S8 n
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
z) R- R0 N) H. O3 Y" eCrawfish 1 0.1 0.1 0.1 0.1 ?+ R! _6 t6 ?, g+ _$ {
Drum, Freshwater 2 0.22 0.22 0.03 0.4
9 T7 [8 E- J5 m3 x- M" SEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
. n6 S8 J& t8 V0 yEel (species not specified) 107 0.24 0.16 0.01 1.70
0 Y% n4 Z# T3 {/ Q8 m, oFlounder (various species) 22 0.06 0.06 0.03 0.12( z1 K; x% c( L9 L) G- D8 w
Haddock 3 0.05 0.05 0.03 0.07 |
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