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Human Health Risk Assessment of Mercury in Fish March 2007
2 B1 T1 M0 f/ d$ N% M+ u. @and Health Benefits of Fish Consumption4 ?: u" g/ I4 U2 K2 z/ B9 q
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
- b0 l6 V( ]2 U/ d9 C, Y! apresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical, _" J) K6 y, ^! ^
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the; s3 j' [8 @; f/ ]3 F0 F
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
* P+ S* n \% H4 h" [level increasing with age of the fish. In turn, bio magnification along the food chain leads to
' A# W6 O. [( ihigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
! X4 R3 F# Z- R! L1 r$ X0 _organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
/ J! [ f/ q& R; W4 \$ Wlesser extent than methyl mercury.
) p+ @) g% j$ q- C! c3 q' L- xAPPENDIX I
- L5 V2 U3 }9 M. ~1 s2 eSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
+ X% x2 N1 m" [7 L(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
$ ]* {) S! ?) G3 i ]& eSamples were collected at the importers= or at domestic processing plants during the periods April 1,. G* I' e. m3 }* Z( V* [
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A4 V+ {; r$ F) }# [' W8 `3 m# `" f
concentration of zero indicates that mercury was not detected above the analytical detection limit.6 G+ } c: F6 _) `5 i' Z5 L
Total Mercury Concentration
( g) f& n5 p3 K(ppm)
7 F/ K7 r1 |/ b. Y* [Species
- ~" E4 N5 g3 }. ANo. of
# H0 [" c Z6 Y7 n# }samples0 E o% s" K: ^- Q$ H% I, Y
(N) Mean Median Min Max/ e4 E; K2 d% R) L+ c" G, j
Amberjacks 3 0.17 0.14 0.11 0.27: h! O9 _' s& L" ^5 {, M; V
Barracouta 1 0.06 0.06 0.06 0.06
1 m1 Q. x/ u6 k& g7 B3 E7 JBasa 5 0.02 0.02 0.02 0.02( k1 T4 L/ G( e% \! h
Bullhead, Brown 2 0.09 0.09 0.07 0.1
- R' R* C6 j# o8 W3 K' o" yCapelin 4 0.02 0.02 0 0.05
4 A4 [1 D$ J6 _6 l& Q, vCarp 1 0.1 0.1 0.1 0.1: d% H% O1 ?6 u3 s/ d- x
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.374 ?! U4 l/ K' I9 }$ v3 a# ~) n4 _
Char, Arctic 5 0.09 0.10 0.05 0.05; R) B( j! @, L4 }) O) p
Clam (various species) 40 0.03 0.01 0 0.08
1 ?8 B J; C$ h6 BCockle, Greenland 1 0.05 0.05 0.05 0.052 y- |% W4 a' a2 A) b& p Q2 }4 z
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
# O' E, m6 Z' G+ N) N4 a: g3 \/ LCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37- X; Y( L/ `0 e0 [( ]; b6 @8 G
Crawfish 1 0.1 0.1 0.1 0.1, _7 ]) r4 S1 a, g$ h
Drum, Freshwater 2 0.22 0.22 0.03 0.4; p/ |- @. F# {! B" B) c4 F. c
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
/ q- H8 x6 h, V) VEel (species not specified) 107 0.24 0.16 0.01 1.704 n$ u: r$ N0 |5 M: w& z
Flounder (various species) 22 0.06 0.06 0.03 0.12
; M. k4 `8 N7 ^( U" [6 O) D! q% XHaddock 3 0.05 0.05 0.03 0.07 |
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