Age and Growth of Chub Mackerel (scomber Colias) in North and Northwest Iberian Waters Based on Direct Age Estimation and Back-Calculation in Otoliths.

Event Abstract Back to Event Age and growth of chub mackerel (Scomber colias) in North and Northwest Iberian waters based on direct age estimation and back-calculation in otoliths. Maria Rosario Navarro1*, Jorge Landa1, Begoña Villamor1, Carmen Hernández1 and Rosario Dominguez2 1 Instituto Español de Oceanografía (IEO), Spain 2 Instituto Español de Oceanografía (IEO), Spain Atlantic chub mackerel (Scomber colias, Gmelin, 1978) is a middle-sized pelagic fish distributed in warm and temperate waters. Its landings have significantly increased in the most recent years in the Iberian Peninsula, possibly related to the rise in its abundance due to an increase of the water temperature, and resulting a new target species for both Portuguese and Spanish purse seiner fleets. This has increased the EU interest in its biological knowledge in order to launch its stock assessment in the near future. The study of this species is framed within the Spanish National Program of collection, management and use of data in the fisheries sector and support for scientific advice regarding the Common Fisheries Policy. Based in samples from commercial catches and scientific surveys between 2011 and 2017, this work studies the age and growth of chub mackerel in North and Northwest Iberian waters. The age of the specimens were estimated by interpreting the annual increments (annuli) of the otoliths based in the age estimation criteria for this species established during the first ICES Workshop on Age Reading of Chub Mackerel otoliths, WKARCM. The consistency of the age estimations was checked by international otolith exchanges among international readers of different institutions. Age-length keys were here performed by direct age estimation and length-at-age values from two consecutive years were also estimated by backcalculation, providing consistency to the age estimation. Von Bertalanffy growth parameters, based on direct otolith observation and backcalculation, were estimated and compared with those of previous studies. In addition, the annual length distributions of the catch showing interannual variability are presented. Length/weight relationship, and mean length and weight at age were also estimated. The age and growth results here obtained are now available for the analytical stock assessment. Keywords: Age-length key, Length - weight relationship, length distribution, Growth parameters, Back-calculation Conference: XX Iberian Symposium on Marine Biology Studies (SIEBM XX) , Braga, Portugal, 9 Sep - 12 Sep, 2019. Presentation Type: Poster Presentation Topic: Fisheries, Aquaculture and Biotechnology Citation: Navarro M, Landa J, Villamor B, Hernández C and Dominguez R (2019). Age and growth of chub mackerel (Scomber colias) in North and Northwest Iberian waters based on direct age estimation and back-calculation in otoliths.. Front. Mar. Sci. Conference Abstract: XX Iberian Symposium on Marine Biology Studies (SIEBM XX) . doi: 10.3389/conf.fmars.2019.08.00096 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: 13 May 2019; Published Online: 27 Sep 2019. * Correspondence: Mx. Maria Rosario Navarro, Instituto Español de Oceanografía (IEO), Madrid, Spain, charo.navarro@ieo.es 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 Maria Rosario Navarro Jorge Landa Begoña Villamor Carmen Hernández Rosario Dominguez Google Maria Rosario Navarro Jorge Landa Begoña Villamor Carmen Hernández Rosario Dominguez Google Scholar Maria Rosario Navarro Jorge Landa Begoña Villamor Carmen Hernández Rosario Dominguez PubMed Maria Rosario Navarro Jorge Landa Begoña Villamor Carmen Hernández Rosario Dominguez 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.