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Precise age estimation from different ageing structures in the striped snakehead, Channa striata (Bloch,1793), collected from the river Ganga

Salman Khan1 and Mohammad A. Khan2*
  • 1 Aligarh Muslim University, Department of Zoology, India
  • 2 Aligarh Muslim University, Department of Zoology, India

In Channa striata (N=156; TL=17-60cm) sampled from the river Ganga, the annuli laid on different ageing structures such as otoliths (whole and sectioned), scales, opercular bone and vertebrae were observed for age estimation. Standard procedures were followed to prepare and study the age structures. Age estimates obtained from different hard structures were analysed to calculate the parameters for precise age estimation viz., APE, CV and PA. The sectioned otoliths showed the highest (89.9%) percentage of agreement between readers while least average percent error (1.20%) and coefficient of variation (3.81%) values between two readers. Thus sectioned otoliths were considered to be the most suitable method for estimating age in C. striata. When sectioned otoliths were compared with other bony structures, the highest percent agreement and lowest average percent error and coefficient of variation values were found between sectioned otoliths and whole otoliths age estimates.

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Acknowledgements

Authors are thankful to the Chairman of the Department of Zoology, Aligarh Muslim University, Aligarh, India for providing necessary facilities for the study. The authors gratefully acknowledge Council of Science and Technology, Uttar Pradesh, Lucknow for funding the study and providing financial assistance to the presenting author.

References

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Khan, M. A.; Khan, S., 2009: Comparison of age estimates from scale, opercular bone, otolith, vertebrae and dorsal fin ray in Labeo rohita (Hamilton), Catla catla (Hamilton) and Channa marulius (Hamilton). Fish. Res. 100, 255–259.
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Keywords: Channa striata, otoliths, Precise age, Percentage of agreement, average percentage of error, coefficient of variation.

Conference: XV European Congress of Ichthyology, Porto, Portugal, 7 Sep - 11 Sep, 2015.

Presentation Type: Poster Presentation

Topic: Otoliths as a tool to study fish life cycles

Citation: Khan S and Khan MA (2015). Precise age estimation from different ageing structures in the striped snakehead, Channa striata (Bloch,1793), collected from the river Ganga. Front. Mar. Sci. Conference Abstract: XV European Congress of Ichthyology. doi: 10.3389/conf.fmars.2015.03.00114

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Received: 14 Nov 2015; Published Online: 22 Nov 2015.

* Correspondence: Dr. Mohammad A Khan, Aligarh Muslim University, Department of Zoology, Aligarh, Uttar Pradesh, 202002, India, khanmafzal@yahoo.com