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Mercury Concentrations in Tuna (Thunnus albacares and Thunnus obesus) from the Brazilian Equatorial Atlantic Ocean
Ist Teil von
Bulletin of environmental contamination and toxicology, 2017-02, Vol.98 (2), p.149-155
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2017
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
Average total Hg concentrations measured in muscle of two species of tuna (
Thunnus obesus
and
T. albacares
) captured in the Brazilian Equatorial Atlantic Ocean varied from 95 to 1748 ng.g
−1
wet weight in
T. obesus
and 48 to 500 ng.g
−1
wet weight in
T. albacares
. Higher concentrations in
T. obesus
are probably related to foraging on deep water carnivorous fish. Smaller individuals of both species showed the lowest concentrations, but a significant positive relationship between fish weight and length and Hg concentrations was found for
T. obesus
, but not for
T. albacares
. Largest individuals (>30 kg) of
T. obesus
showed Hg concentrations ≥1000 ng.g
−1
, surpassing the legal limits for human consumption, although the average concentration for this species was much lower (545 ng.g
−1
). Concentrations in
T. albacares
from the Brazilian Equatorial were lower than those found in the African and in the North Atlantic. No comparison could be made for
T. obesus
due to few studies for this species in the Atlantic Ocean.