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Morphometric Analyses of the Angular Roughshark, Oxynotus centrina (Oxynotidae), with Biological Notes on Specimens from the Sea of Marmara

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Abstract

Morphometric measurements as percentages of total length of 6 specimens of Oxynotus centrina (Linnaeus, 1758), captured in the Sea of Marmara were reported. All of the analyzed proportions of landmark measurements as percentage of total length show allometry. Although, slight differences were seen between the morphometrics of Marmara specimens of O. centrina and those reported for the angular roughsharks captured in several geographical subregions of the Mediterranean Sea, these variations can be considered admissible based on allopatry. Regarding the mouth morphology in particular, the proportion of head length/mouth width to total length showed negative allometry, indicating O. centrina is a small-mouthed shark compared to increasing body size. A partly digested shark embryon and vitellus like slurry were found in the stomach content of one specimen captured in the Sea of Marmara, which provided supporting evidence for the predation on elasmobranch eggs by O. centrina in the wild.

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ACKNOWLEDGMENTS

Authors thank to Mrs. Meltem Kartal Taşdelen, an İstanbul based scuba diving instructor and underwater photographer, and the crew of Marmara Sualtı Merkezi diving club, and the fisherman Mr. Barış Köksalan for their generous help for providing the death specimens of Oxynotus centrina. Authors are grateful to three anonymous reviewers for their comments, which improved the quality and content of the article. Special thanks go to Dr. Alessandro De Maddalena for the illustration of angular roughshark depicted in Fig. 2, and to Mr. Mark Taylor, an İstanbul based English teacher, scuba dive instructor and underwater photographer for the proofreading of the manuscript.

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No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Istanbul University, Institute of Science, Fisheries Technologies and Management Program, İstanbul, Turkey

    H. Kabasakal

  2. İstanbul University, Faculty of Aquatic Sciences, Department of Fisheries Technologies and Management, İstanbul, Turkey

    U. Uzer & F. S. Karakulak

  3. Istanbul University, Faculty of Aquatic Sciences, Department of Marine Biology, Vezneciler, İstanbul, Turkey

    O. Gönülal & O. Akyüz

Authors
  1. H. Kabasakal
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  2. U. Uzer
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  3. O. Gönülal
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  4. O. Akyüz
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  5. F. S. Karakulak
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Hakan Kabasakal, Uğur Uzer, Onur Gönülal and Onur Akyüz. The first draft of the manuscript was written by Hakan Kabasakal and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to H. Kabasakal.

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ETHICS APPROVAL AND CONSENT TO PARTICIPATE

Animal-related experiments were conducted in accordance with the NIH Guidelines for the care and use of laboratory animals (http://oacu.od.nih.gov/regs/index.htm). All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Angular rough sharks examined in the present study were consisted of bycatch sharks captured in commercial fisheries. Live sharks were never euthanized and their wellfare were never violated. Samples were examined within the scope of the ongoing Stock Identification of Demersal Fishes in the Eastern Marmara Sea project, and ethics committee approval granted by the Local Ethics Committee of Istanbul University Animal Experiments also covers the present study (Project ID: 2714; Approval granted 17.04.2015).

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Kabasakal, H., Uzer, U., Gönülal, O. et al. Morphometric Analyses of the Angular Roughshark, Oxynotus centrina (Oxynotidae), with Biological Notes on Specimens from the Sea of Marmara. J. Ichthyol. 63, 1025–1036 (2023). https://doi.org/10.1134/S0032945223060061

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