Otolith mass asymmetry in Rhynchorhamphus georgi (Valenciennes, 1846)( Family: Hemiramphidae) collected from the Sea of Oman

Laith A. Jawad, Juma M. Al-Mamry, Hager M. Al-Mamari, Manal M. Al-Yarubi, Haithem K. Al-Busaidi, Dawood S. Al-Mamary

Marine Science and Fisheries Centre, Ministry of Fisheries Wealth, P.O. Box 427, Postal Code 100 Muscat, Sultanate of OMAN
High Technical College, Muscat, Sultanate of OMAN


Saccular otolith mass asymmetry was studied in the teleost Rhynchorhamphus georgi collected from the Sea of Oman. It was calculated as the difference between the mass of the right and left paired otoliths divided by average otolith mass. the absolute value of x in R. georgi does not depend on fish length and otolith growth rate as the case of other symmetrical fish species. On the other hand, the absolute value of otolith mass difference is increased with the fish length. The value of x falls between -0.2 and +0.2.

Keywords: Otolith, mass asymmetry, Rhynchorhamphus, the Sea of Oman, Sultanate of Oman


De Jong, H.A.A., Sondag, E.N.P.M., Kuipers, A., and Oosterveld, W.J. (1996) Swimming behaviour of fish during short periods of weightlessness. Aviatiation and Space Environmental Medicine 67: 463- 466.

Egorov, A.D., and Samarin, G.I. (1970) Possible change in the paired operation of the vestibular apparatus during weightlessness. Kosmicheskaya biologiya I Aviakosmicheskaya Meditsina 4: 85-86. (in Russian).

Hilbig, R., Ankan, R.H., Bäuerle, A., and Rahmann, H. (2002) Susceptibility to motion sickness in fish: a parabolic aircraft flight Study. Journal of Gravitational Physiology 9: 29-30.

Hoffman, R.B., Salinas, G.A., and Baky, A.A. (1977) Behavioural analyses of killifish exposed to weightlessness in the Apollo-Soyus test project. Aviatiation and Space Environmental Medicine 48: 712-717.

Jawad, L.A., Al-Mamry, J.M., and Al-Busaidi, H.K. (2010) Otolith mass asymmetry in the teleost Beryx splendens Lowe, 1834 (Family:Bercidae) collected from the Arabian Sea coasts of Oman. Thalassas 26: 43-47

Lychakov, D.V. (1992) Morphometric studies of fish otoliths in relation to vestibular function. Zh. Evol. Biokhim. Fiziol. 28: 531-539 (in Russian).

Lychakov, D.V. (2002) Otolithic membrane: structural and functional organization, evolution, ecomorphological plasticity and tolerance extreme conditions (Doctorskaya Dissertaziya), Vol 1. Sechenov Institute, St.Petersberg (text, tables), pp. 1-266, Vol. 2 (illustrations), pp. 1-107. (in Russian).

Lychakov, D.V., Boyadzhieva-Mikhailova, A., Christov, I., Pashchinin, A.N., Evdokimov, I. I., and Matkov, A.A. (1988) Changes in the otolith apparatus of rat and fish after prolonged exposure to acceleration. Kosmicheskaya biologiya I Aviakosmicheskaya Meditsina 22: 27-33. (in Russian).

Lychakov, D.V., and Rebane, Y.T. (2004) Otolith mass asymmetry in 18 species of fish and pigeon. Journal of Gravitational Physiology 11: 17- 34.

Lychakov, D.V., and Rebane, Y.T. (2005) Fish otolith mass asymmetry: morphometry and influence on acoustic functionality. Hearing Research 201: 55-69.

Lychakov, D.V., Rebane, Y.T., Lombarte, A., Fuiman, L.A., and Takabayashi, A. (2006) Fish otolith asymmetry: morphometry and modelling. Hearing Research 219: 1-11.

Lychakov, D.V., Rebane, T.Y., Lombarte, A., Demestre, M., and Fuiman, L. (2008) Saccular otolith mass asymmetry in adult flatfishes. Journal of Fish Biology 72: 2579-2594.

Rahman, H., and Ankan, R.H. (2002) Gravitational biology using fish as model systems for understanding motion sickness susceptibility. Journal of Gravitational Physiology 9: 19-20.

Samarin, G.I. (1992) Study of the labyrinth Asymmetry and Its Possible Role in the Motion Sickness Genesis (Tezisy Kandidatskoi Dissertazii). Institute for Biomedical Problems, Moscow, pp. 1-33 (in Russian).

Scherer, H., Helling, K., Clarke, A.H., and Hausmann, S. (2001) Motion sickness and otolith asymmetry. Biol. Sci. Space 15: 401-404.

Takabayashi, A. (2003) Functional asymmetry estimated by measurements of otolith in fish. Biological Science of Space 17: 293-297.

Von Baumgarten, R.J., Wetzig, J., Vogel, H., and Kass, J.R. (1982) Static and Dynamic Mechanisms of Space Vestibular Malaise. Physiologist 25: 33-36.