Abstract
The Trichogaster fasciata (Bloch and Schneider, 1801) is a small, indigenous, tropical labyrinth perch of Osphronemidae family with a great value in the ornamental fish industry and biological experiment. Morphological descriptors of the sagitta otolith are used as an important tool in fish taxonomy and fish biology. Detailed morphological and morphometrical characteristics of almost all visible descriptors of sagitta otolith in different body length groups of T. fasciata are described. The sagitta contains a heterosulcoid, ‘J”-shaped, ostio-caudal sulcus with a distinct rostrum and orthorostrum patch. Different morphostructural development in the ortho-rostrum patch is directly proportional to the total length. The caudal fork is well-developed and its growth is directly proportional to the total length. The marginal sculptures of the sagittae comprised numerous scallops, whose shape and size are considerably changed with the increment of the total length. The Kruskal–Wallis H test revealed that some sagitta descriptors display important changes in different body length groups of T. fasciata. About nineteen sagitta descriptors among the studied structures display a significant developmental relationship to the increment of the total length and they might be used as an important predictor to evaluate the fish size. Different shape indices of the sagitta and the sulcus are analyzed, some of which have a significant relationship to the total length. These shape indices and the sagitta predictors might be useful in stock separation of the T. fasciata. The characteristics of the sagitta descriptors of T. fasciata are compared with the available data of other Anabantiformes fishes.
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Acknowledgements
The authors are thankful to the Fish Division, Zoological Survey of India (ZSI), Kolkata, for identification of the studied fish in this work. The authors are also grateful to Dr. Arghya Adhikary and Mr. Prathyush Sen Gupta, Centre for Research in Nanoscience and Nanotechnology (CRNN), University of Calcutta, Kolkata for their necessary help in scanning electron microscope photography. We gratefully acknowledge the principal and all staffs of the Department of Zoology of City College, Kolkata, West Bengal for their encouragement for this work. We are thankful to the Head and all faculty members of the Department of Zoology, West Bengal State University, Barasat, West Bengal, India for their co-operations. The authors also grateful to the two anonymous reviewers for their constructive suggestions on the manuscript.
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S.R. designed the work, wrote the main manuscript, prepared the figures, and performed the statistical representation; S.R. and U.G.R. collected the sample, dissected the sagitta otolith, prepared for SEM studies, tabulated and analyzed the morphological and morphometric data and prepared the reference list. All the authors reviewed the whole manuscript.
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Roy, S., Roy, U.G., Ghorai, N. et al. Developmental variations of sagitta otolith in different body size groups of Trichogaster fasciata (Bloch and Schneider, 1801). Zoomorphology (2024). https://doi.org/10.1007/s00435-024-00646-7
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DOI: https://doi.org/10.1007/s00435-024-00646-7