Reproduction biology of common nase Chondrostoma nasus (Pisces, Cyprinidae)

Event Abstract Back to Event Reproduction biology of common nase Chondrostoma nasus (Pisces, Cyprinidae) Dorota Juchno1*, Bartosz Jagusztyn2 and Alicja Boron3 1 University of Warmia and Mazury in Olsztyn, Poland 2 Department of Animal Physiology and Reproduction, University of Rzeszow, Poland, Poland 3 Department of Zoology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Poland Common nase, Chondrostoma nasus (L.), is a rheophilic cyprinid inhabiting moderate to fast-flowing large to medium sized rivers with rock or gravel bottom. This species spawns in early spring, in riffle segments of rivers (Keckeis 2001). Locally threatened due to damming, destruction of spawning sites and pollution (Freyhof, 2011). The aim of the present study was determination of selected features of reproductive biology of Ch. nasus females and males as external morphology, fecundity and histological structure of the gonads. Mature females and males, respectively five and three individuals were caught from the Wisłok River, at monthly intervals, from April to October. Water temperature was measured at the sampling point. All individuals were measured and weighed with accuracy to 1mm and 1g respectively. Fragments of the gonad were fixed in buffered formalin or Bouin's liquid, and the histological sections were stained with hematoxylin and eosin. The age of the females was determined on the basis of annual scales increments. The absolute and relative fecundity was calculated using the gravimetric method on the basis of 34 females caught in October. The common nase belongs to the group of fish spawning once a year; the population from Wisłok River proceeds to spawn in April (or at the turn of May and April) when the water temperature reaches 9-10 °C. During the spawning period, intense coloration of the female and male body was observed. In males, the spawning rash covered the whole body, while in females there were single nodules of the spawning rash within the head. In October, in the ovaries, mature oocytes (filled with yolk) accounted 68%; this indicates the possibility of artificial spawning earlier than April and obtaining larger fry for spring or autumn restocking. The final formation of sperm in testes probably occurs shortly before spawning. The absolute fecundity was on average 17274 ( 6,250) eggs and showed a positive correlation with the weight and length of the body as well as the age of the females. Most eggs were produced by the largest and oldest females. Relative fecundity was on average 36 ( 2.47) eggs/kg and showed a negative correlation with the weight and length and age of females. Common nase produced eggs with an average size of 2.1 mm in diameter. In addition, it was shown that larger females lay significantly statically larger eggs. Acknowledgements We express our special thanks to Slawomir Boron, PhD for collecting fish. This work was carried out within the project no. 12.610.006-300 and no. 12.620.042-300 of the University of Warmia and Mazury in Olsztyn, financed by Ministry of Science and Higher Education, Poland. References Keckeis H. 2001. Influence of river morphology and current velocity conditions on spawning site selection of Chondrostoma nasus (L.). Arch. Hydrobiol. (Suppl. 135) Large Rivers 12: 341-356. Freyhof, J. 2011. Chondrostoma nasus (errata version published in 2016). The IUCN Red List of Threatened Species 2011: e.T4789A97800985. http://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T4789A11094713.en. Keywords: Histology of gonads, fecundity, ovaries, testes, size of eggs, Spawn Conference: XVI European Congress of Ichthyology, Lausanne, Switzerland, 2 Sep - 6 Sep, 2019. Presentation Type: Poster Topic: ECOLOGY AND LIFE CYCLES Citation: Juchno D, Jagusztyn B and Boron A (2019). Reproduction biology of common nase Chondrostoma nasus (Pisces, Cyprinidae). Front. Mar. Sci. Conference Abstract: XVI European Congress of Ichthyology. doi: 10.3389/conf.fmars.2019.07.00015 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 27 May 2019; Published Online: 14 Aug 2019. * Correspondence: Dr. Dorota Juchno, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland, juchno@uwm.edu.pl Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Dorota Juchno Bartosz Jagusztyn Alicja Boron Google Dorota Juchno Bartosz Jagusztyn Alicja Boron Google Scholar Dorota Juchno Bartosz Jagusztyn Alicja Boron PubMed Dorota Juchno Bartosz Jagusztyn Alicja Boron Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.