Some aspects of the life history of Oxynoemacheilus bergianus (Actinopterygii: Nemacheilidae) from the Jajrud River in the Namak Lake basin, Central Iran

Document Type : Research Paper

Authors

1 School of Biology and Centre of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran, Iran

2 Department of Fisheries, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran

3 Metropolitan Environmental Prevention Area - Regional Agency for Prevention, Environment and Energy of Emilia-Romagna (Arpae), Italy

4 Inland Waters Aquaculture Research Center, Iranian Fisheries Sciences Research Institute, Agricultural Research, Education and Extension Organization, Bandar Anzali, Iran

10.22124/cjes.2022.5722

Abstract

The length-weight relationship, breeding season and condition factor of Oxynoemacheilus bergianus from Jajrud River in the Namak Lake basin, Tehran Province, Central Iran, were investigated. Sampling was performed from March 2017 to February 2018. The biometric measurements and the body and gonad weights were monthly carried out for one year log sampling occasions, in a total of 546 specimens. The range of total length in males and females were 3.8-7.5 and 3-7.6 cm, and the range of total weight were correspondingly 0.36-3.53 and 0.2-4.67 g respectively. The calculated coefficient of determination (r2) in males and females was found to be 0.94 and 0.95, respectively reflecting a positive allometric (b > 3, p > 0.05) growth in both sexes. The gonadosomatic index and modified gonadosomatic index showed that O. bergianus spawns in the middle of spring in May. In agreement with that, the condition factor reached the minimum (0.60) in February, while the maximum (0.96) in May. Since there is poor conservation status of the species, this study aims to give a contribution for biologists and wildlife managers.  

Keywords


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