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Human Health Risk Assessment of Mercury in Fish March 2007
- S+ H% k& H# w# s# ^3 fand Health Benefits of Fish Consumption. A) ]0 B8 X/ }; F: K, q, U
With respect to the types of mercury found in fish, both inorganic and organic mercury may be7 Y" R& U! K/ c, P
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical! S- L# ~5 H5 O
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the+ j+ T/ o" l$ D$ l$ E1 `: p
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
# G# L$ ]4 j, f8 s7 J2 C! vlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
/ d6 _, i3 H5 l8 Jhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other# }$ r1 m$ c! G' R
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far8 f ~0 q2 A. r R" f
lesser extent than methyl mercury.
& P0 ]' u+ h0 n4 k7 VAPPENDIX I
7 h- |. x$ s5 b1 FSummary data for those samples of fish that were found by the Canadian Food Inspection Agency) Z) {0 p5 N, }. h
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
' H$ n3 t4 |# c. x5 Y" q. KSamples were collected at the importers= or at domestic processing plants during the periods April 1,% s, _% o/ ]7 W# ~: b
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A8 Y: F) q L. \; o1 p
concentration of zero indicates that mercury was not detected above the analytical detection limit.
+ r( v2 o7 p/ w, K& G3 X) ]Total Mercury Concentration
, I% `6 o+ f: t. J+ O4 Q/ e1 F3 W+ P. G(ppm); Q4 G3 z; O2 ~
Species
' l* f. }( ~, _/ JNo. of# k! c/ {3 x& Z% E, X" r
samples
9 E4 u; ~5 v4 Q(N) Mean Median Min Max
' j+ p7 S4 ~1 w- X" lAmberjacks 3 0.17 0.14 0.11 0.27
5 d+ |# P) J# J, l1 i, PBarracouta 1 0.06 0.06 0.06 0.06$ s' C+ S/ K# {' A% e8 i' x7 o3 b
Basa 5 0.02 0.02 0.02 0.02
/ ^! a2 `6 H# qBullhead, Brown 2 0.09 0.09 0.07 0.1
[: }) R& h* qCapelin 4 0.02 0.02 0 0.05
/ ~5 Y- F8 `. N- u2 D {! k) ZCarp 1 0.1 0.1 0.1 0.1
- c# |2 a! t. |& A% I5 zCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37! R; P+ W* _! e/ l! J1 A
Char, Arctic 5 0.09 0.10 0.05 0.05
( B8 ` d, \7 e1 ^7 \& a7 [9 ~Clam (various species) 40 0.03 0.01 0 0.08
$ B& k, Z7 J# I7 a* _; qCockle, Greenland 1 0.05 0.05 0.05 0.05+ n/ _# J& X% ?% P) f: \
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
1 N9 z+ m' T2 W# i, qCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
( q+ P1 u; v- g. h& G6 e* lCrawfish 1 0.1 0.1 0.1 0.1! _" U, x9 a: }% s2 ?5 W! l! p
Drum, Freshwater 2 0.22 0.22 0.03 0.4. ` g+ n- \5 I: a$ L5 ^ W
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.762 D) s5 ?# T! T7 r4 h: ^
Eel (species not specified) 107 0.24 0.16 0.01 1.70
, Q2 q A) _$ Q* K; D7 iFlounder (various species) 22 0.06 0.06 0.03 0.121 B9 a! b% }8 \7 b" _! `
Haddock 3 0.05 0.05 0.03 0.07 |
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