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Human Health Risk Assessment of Mercury in Fish March 20078 t6 e1 U1 U- Z1 A, F
and Health Benefits of Fish Consumption4 c: C! b. Y! S/ d$ T/ B
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
! r' u; R, t- B1 g, }present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical0 Y- Q( K- K( E, Z) R
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the% U: q) h% {& W! _
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
" a& d; r- Y8 Ulevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
$ O+ l: I9 ]6 c' Qhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other: F5 q C1 U+ Z$ w; L1 B" c
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
: w5 c. D/ |2 ^, b: \# n# a0 Q7 Klesser extent than methyl mercury.
0 q% y, }% ^$ ]- q+ TAPPENDIX I+ S; U2 @# M% x/ H1 W$ w U; T- s
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
9 F) y; V" h: t9 a6 U$ y6 X(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
/ e. M' z/ s$ F- KSamples were collected at the importers= or at domestic processing plants during the periods April 1,
$ y7 |/ ^) Q7 h+ A3 n2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A- h* |' Z, u8 Q
concentration of zero indicates that mercury was not detected above the analytical detection limit.0 Q: ~9 l; m' ~
Total Mercury Concentration& `+ y. y* D0 C( F; U" U8 R: b
(ppm)
" T* x# l# G: g2 U- T+ LSpecies
3 E% n0 i$ D+ K$ D+ }No. of
0 J4 `* x+ Y1 v( o& C+ G& O# `samples$ M) y$ m( p( v/ O; e
(N) Mean Median Min Max6 H8 @2 Z( N; s& P# e a
Amberjacks 3 0.17 0.14 0.11 0.27
+ H S4 A8 _3 ?" S/ @3 {Barracouta 1 0.06 0.06 0.06 0.06
4 J/ i. a( t$ N6 k+ D" sBasa 5 0.02 0.02 0.02 0.02
& j6 a0 B0 F8 |) _6 s" RBullhead, Brown 2 0.09 0.09 0.07 0.1# i# T5 x( r+ N7 R6 N+ b# J
Capelin 4 0.02 0.02 0 0.057 p. Z4 _7 S( c9 f% w; L$ U5 f
Carp 1 0.1 0.1 0.1 0.1& D* q) z1 p* J2 n$ k% V! C
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
( E- C3 ^8 h2 d" UChar, Arctic 5 0.09 0.10 0.05 0.05+ a, r7 ?; G, U8 w) {0 U. V7 h- u
Clam (various species) 40 0.03 0.01 0 0.087 ?7 [8 i: S. t& w# W* x
Cockle, Greenland 1 0.05 0.05 0.05 0.05
g9 p& w5 s, B# ]' \6 g: JCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.284 o( M a7 x. S+ A, A
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
; n G- K. D# \3 |8 tCrawfish 1 0.1 0.1 0.1 0.13 h1 Y4 J8 A5 w: u4 ^
Drum, Freshwater 2 0.22 0.22 0.03 0.4
& \- A+ R9 p! ~* o% E' }$ REel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.768 U: l$ l2 V5 B
Eel (species not specified) 107 0.24 0.16 0.01 1.70
1 Q& ^8 J) a- O0 nFlounder (various species) 22 0.06 0.06 0.03 0.124 G' B$ i- T$ Q9 Y' h8 x9 D
Haddock 3 0.05 0.05 0.03 0.07 |
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