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Human Health Risk Assessment of Mercury in Fish March 2007
! R( P/ v2 ]* ^, t6 s, `and Health Benefits of Fish Consumption P. M- Z- |9 e6 v# L% Z1 k# v
With respect to the types of mercury found in fish, both inorganic and organic mercury may be) V/ g1 f. M( P% b
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical* ~$ a+ _9 R6 L* r
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the# e- q+ K1 x1 ?0 N( \: ~& o
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury4 j% v, O# E7 B2 F$ o/ o
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
/ n$ `9 y7 N: o* Ohigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
7 }6 x$ S8 G; I+ {/ h0 j0 D& Morganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
; _9 L* V$ _7 I7 y8 K* d. elesser extent than methyl mercury.
; \7 P# C }0 }- l9 BAPPENDIX I( W3 ?: m1 x4 v' n3 z" n
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
8 v3 d! }1 X% P9 M1 d" c3 {, }(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
& P0 _& [) a$ ]1 m. USamples were collected at the importers= or at domestic processing plants during the periods April 1,
, `) R( z s- j5 s2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A; V' A5 ~, P. ~/ o; ^2 y R1 _
concentration of zero indicates that mercury was not detected above the analytical detection limit.
6 @# w% q7 c) HTotal Mercury Concentration
2 I/ R. I$ A+ @$ V, G" @5 ]9 X; a(ppm)
" @- ^' {# ]3 F9 mSpecies
: V2 H% D/ D* @. I% fNo. of
/ Y# l- `- u; Ksamples
7 B1 h" q1 b( e% a2 K(N) Mean Median Min Max8 d2 O% O: z4 F" t
Amberjacks 3 0.17 0.14 0.11 0.27* h O& J, W/ |1 c8 \5 g
Barracouta 1 0.06 0.06 0.06 0.06
! Q, z: O6 m1 |5 NBasa 5 0.02 0.02 0.02 0.02
+ ~. t' Q) I, FBullhead, Brown 2 0.09 0.09 0.07 0.15 @$ F0 S: j5 s y: c% c
Capelin 4 0.02 0.02 0 0.05, r% R R+ H" Y, q
Carp 1 0.1 0.1 0.1 0.1! F" N; p" U6 h3 e- k
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
& X# q1 {% {. `: o9 oChar, Arctic 5 0.09 0.10 0.05 0.059 ]6 L; I3 W: A$ k
Clam (various species) 40 0.03 0.01 0 0.08* x5 O# V) H" y6 f) g9 s
Cockle, Greenland 1 0.05 0.05 0.05 0.05
0 j) O0 q; p2 Z3 S2 cCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.280 A3 }% ?, {! G5 ~8 e* F( p! R
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
6 ~9 T* g7 G1 i) RCrawfish 1 0.1 0.1 0.1 0.12 B/ a( ]% e( a7 F4 g) t2 D3 e
Drum, Freshwater 2 0.22 0.22 0.03 0.4
# W" O* ~+ x7 n# U% X4 X* A2 oEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
; U2 |4 V+ J LEel (species not specified) 107 0.24 0.16 0.01 1.70
4 [7 _; u4 s% c9 v Z& Q0 q; z" qFlounder (various species) 22 0.06 0.06 0.03 0.12! C2 Q) v% b2 z
Haddock 3 0.05 0.05 0.03 0.07 |
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