Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae)
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| Formato: | Online |
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Universidad de Costa Rica
2007
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| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/rbt/article/view/5973 |
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RBT59732023-03-16T16:19:11Z Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) L. Ibañez, Ana A. Romo Coronel, Marco Oreochromis edad repoblamientos otolitos escamas annuli circuli age stockings otoliths fish scales Lake Metztitlán was dried up completely in the spring of 1998 and refilled in August of that year. In the period September-November, two cohorts of 1.6 million juveniles of a tilapia hybrid were stocked (Oreochromis aureus/O. niloticus), and monitored every month for one year. Since the date of birth of these juveniles was known, the analyses focused on whether the ring marks of the scales, sagittae and opercula or the circuli of the scales could be used to age them. The ring marks of the scales and opercula showed great variability, and the sagittae had a significant relationship with length, but it is unclear if at least the first ring mark could be formed at the hatchery and reflect changes in diet and/or tank movements in the fish farm. The circuli had a continuous regular behavior, with a formation rate of 10.38±0.93 and 11.38±0.95 circuli/month for the first and second cohorts, respectively. This proportion was maintained during the study period, and could be of help to calculate an approximate age of juveniles, especially in stocked fish that show multiple ring marks because of manipulation in fish farms and stocking events. Universidad de Costa Rica 2007-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article Text application/pdf https://revistas.ucr.ac.cr/index.php/rbt/article/view/5973 10.15517/rbt.v55i3-4.5973 Revista de Biología Tropical; Vol. 55 No. 3-4 (2007): Volume 55 – Regular number 3-4 – September-December 2007; 1005–1013 Revista de Biología Tropical; Vol. 55 Núm. 3-4 (2007): Volumen 55 – Número regular 3-4 – Setiembre-Diciembre 2007; 1005–1013 Revista Biología Tropical; Vol. 55 N.º 3-4 (2007): Volume 55 – Regular number 3-4 – September-December 2007; 1005–1013 2215-2075 0034-7744 10.15517/rbt.v55i3-4 eng https://revistas.ucr.ac.cr/index.php/rbt/article/view/5973/5680 Copyright (c) 2007 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0 |
| institution |
Universidad de Costa Rica |
| collection |
Revista de Biología Tropical |
| language |
eng |
| format |
Online |
| author |
L. Ibañez, Ana A. Romo Coronel, Marco |
| spellingShingle |
L. Ibañez, Ana A. Romo Coronel, Marco Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) |
| author_facet |
L. Ibañez, Ana A. Romo Coronel, Marco |
| author_sort |
L. Ibañez, Ana |
| title |
Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) |
| title_short |
Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) |
| title_full |
Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) |
| title_fullStr |
Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) |
| title_full_unstemmed |
Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) |
| title_sort |
formation of ring marks in stocked tilapia juveniles (oreochromis aureus/o. niloticus) (perciformes: cichlidae) |
| title_alt |
Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae) |
| publisher |
Universidad de Costa Rica |
| publishDate |
2007 |
| url |
https://revistas.ucr.ac.cr/index.php/rbt/article/view/5973 |
| work_keys_str_mv |
AT libanezana formationofringmarksinstockedtilapiajuvenilesoreochromisaureusoniloticusperciformescichlidae AT aromocoronelmarco formationofringmarksinstockedtilapiajuvenilesoreochromisaureusoniloticusperciformescichlidae |
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