NDLI: Assessment of growth zones on whole and thin-sectioned otoliths in Sperata aor (Bagridae) inhabiting the River Ganga, India

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Journal of Ichthyology : Volume 56, Issue 1, January 2016

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Assessment of growth zones on whole and thin-sectioned otoliths in Sperata aor (Bagridae) inhabiting the River Ganga, India

Content Provider	Springer Nature Link
Author	Khan, M. A. Nazir, A. Khan, S.
Copyright Year	2016
Abstract	The present study was undertaken with the objective to assess the clarity of growth zones on whole and thin-sectioned otoliths in Sperata aor. A total of 125 sagittal otoliths of S. aor were collected monthly from the river Ganga during the period, April to December 2013 at Narora, Uttar Pradesh, India. Thin sections (approximately 0.5 mm) of one of the sagittal otoliths of each fish were cut using IsoMet® Low Speed Saw. Both whole otoliths and thin-sectioned otoliths were then examined under stereozoom microscope. Parameters of agreement on growth zones were calculated by comparing the number of growth zones obtained independentlyby the two readers (R1 and R2) from the two methods (whole otolith and thin-sectioned otolith method). Thin-sectioned otolith method exhibited higher agreement than whole otolith method based on linear regression analysis and growth zones bias plot. Between readers, higher agreement was noted for reader 1 than reader 2, plausibly due to his relatively more experience in examining the growth zones on the otoliths. However, both readers reported independently that the growth zones were clearer on thin sections than on whole otoliths especially those from older individuals. Thus, it may be concluded that the thin-sectioned otolith method should be utilized for assessment of growth zones in S. aor populations from the river Ganga.
Starting Page	242
Ending Page	246
Page Count	5
File Format	PDF
ISSN	00329452
Journal	Journal of Ichthyology
Volume Number	56
Issue Number	2
e-ISSN	15556425
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-05-14
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Growth zones whole otolith thin-sectioned otolith Sperata aor the river Ganga Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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