Dear List
Many thanks for everybody who replied for my request. However I would like to
update some information on this matter
1. I have received number of reasons and explanations for this rainbow color
in tuna muscle. However, there is no proper conclusion.
2. Even there is no real health hazards or any other quality problem, some
european buyers do not accept tuna just because of this rainbow color.
Therefore this is a problem for our exporters. There is no any indication from
the outside, and fish has to cut in to pieces to see the colors. So, it is
easily visible in tuna stakes and loins. As this is an unpreventable matter so
far, our industry people and exporters want to find an early detection method
for these colors (should he able to apply in landing sites). Then they can
reject whole fish even before processing.
3. I have done few tests, but unable to find any significant differences in
bacterial counts (including luminous bacteria). However lipid content seems to
be bit high, but not significant. Generally these rainbow colors are more
common in bigeye tuna than other tuna varieties.
4. If anyone got any related information, please let me know.
Many thanks,
Ranjith Edirisinghe
Head / Post Harvest Technology Division
National Aquatic Resources Research & Development Agency (NARA)
Sri Lanka
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