Effects
of dietary peppermint (Mentha piperita) essential oil on survival,
growth, cannibalism and hepatopancreatic histopathology of Portunus
pelagicus juveniles
Syahirah
Roslan, Sofea Taher, Fariborz Ehteshamei, Aziz Arshad and Nicholas Romano*
Department of
Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400
Serdang, Selangor, Malaysia
*Corresponding
Author E-mail: romano.nicholas5@gmail.com
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Publication
Data
Paper received:
21 May 2015
Revised received:
11 November 2015
Accepted:
09 April 2016
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Abstract
A
two-part experiment was performed to determine whether dietary peppermint oil
could improve the growth and/or decrease aggression among blue swimmer crab, Portunus
pelagicus early juveniles. A total of five isonitrogenous diets were made
that contained increasing peppermint oil levels of 0.00, 0.05, 0.10, 0.50 or
1.00%.? These diets were fed to 45 replicate crabs in each treatment (total
of 225 crabs) for 12 days, the final sizes and weights were measured, and
then placed in 3 replicate containers (30 in total/treatment) to allow the
opportunity for cannibalism over 10 days.? After 10 days, the remaining crabs
were examined for any histopathological changes in gills or hepatopancreas.?
Results showed dietary peppermint oil, at the tested levels, had no effect on
the growth or cannibalism, in either experiments (p > 0.05).? However,
there were substantial changes in the hepatopancreatic histopathology that
included thinner tubules and significantly less B- and R-cells from 0.10%
dietary peppermint oil and above.? The unaffected growth or cannibalism indicate
that the levels of dietary peppermint oil used were insufficient and further
investigations are required, particularly on the implications to the
hepatopancreatic changes. ?
Key
words
Cannibalism,
Crabs, Essential oil, Histopathology, Mentha, Pulegone
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