Reproduction of the non-native fish Lepomis gibbosus (Perciformes: Centrarchidae) in Brazil

Santos, Rangel E.; Silva, Tayara P.; Chehayeb, Igor V.; de Magalhães, André L. B.

dc.creator	Santos, Rangel E.
dc.creator	Silva, Tayara P.
dc.creator	Chehayeb, Igor V.
dc.creator	de Magalhães, André L. B.
dc.date	2012-09-14
dc.date.accessioned	2016-05-03T15:36:29Z
dc.date.available	2016-05-03T15:36:29Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/1810
dc.identifier	10.15517/rbt.v60i3.1810
dc.identifier.uri	https://hdl.handle.net/10669/27665
dc.description	Minas Gerais is the fourth largest Brazilian state, and has an estimate of 354 native fish species. However, these fish species may be threatened, as this state has the highest rank of fish introductions reported for Brazil and South America. As one from the total of 85 non-native species detected, Lepomis gibbosus was introduced in the 60s to serve both as foragefish and to improve sport fishing. In this study, we evaluated the establishment of L. gibbosus in a shallow lake in the city of Ouro Preto, Doce River basin, state of Minas Gerais, Southeastern Brazil. We collected fish with fishing rods every two months from March 2002-February 2003. Fragments of gonads from a total of 226 females and 226 males were obtained and processed following standard histological techniques; then 5-7μm thickness sections were taken and stained in hematoxylin-eosin. Besides, for each specimen, the biometric measurements included the standard length (SL) and body weight (BW); and the sex ratio was obtained. The reproductive cycle stages were confirmed by the distribution of oocytes and spermatogenic cells. The type of spawning was determined by the frequency distribution of the reproductive cycle stages and ovarian histology. Based on the microscopic characteristics of the gonads, the following stages of the reproductive cycle were determined: one=Rest, two=Mature, three=Spawned for females or Spent for males; males and females in reproduction were found throughout the study period. Post-spawned ovaries containing oocytes in stages one (initial perinucleolar), two (advanced perinucleolar), three (pre-vitellogenic), four (vitellogenic) and post-ovulatory follicles indicated fractionated-type spawning in this species. The smallest breeding male and female measured were 4.6 and 4.9cm standard length, respectively, suggesting stunting. The sex ratio did not vary between males and females along the year and bimonthly, being 1:1. Moreover, L. gibbosus appears to be at stage three of biological invasion: establishment through reproduction. We suggest to deliver information about “non-native species” through lectures in schools, colleges/ universities, NGOs, government and environmental agencies in the cities and villages, in order to try to prevent environmental degradation by the introduction of non-native fish such as L. gibbosus in the region. We also recommend high fines for redhanded, and the import ban of non-native fish species to the region.	en
dc.description	Se analiza el establecimiento del pez introducido Lepomis gibbosus en una laguna natural de la ciudad de Ouro Preto, Cuenca del Rio Doce, provincia de Minas Gerais, región sureste de Brasil. Cada dos meses se realizaron muestreos con anzuelo y línea, entre marzo 2002-febrero 2003 y se capturaron 226 hembras y 226 machos. Se encontraron hembras y machos en actividad reproductiva durante todo el muestreo. Ovarios con signos de desove con oocitos de diferentes tallas y folículos post-ovulatorios indicaron la puesta parcial para L. gibbosus. La hembra y macho en reproducción más pequeños tenían entre 4.6cm y 4.9cm de longitud, que caracteriza el enanismo. La proporción sexual fue 1:1 y no presentó diferencias bimensuales ni anuales. De las cinco fases del proceso de bioinvasión, se confirmó que L. gibbosus se encuentra en la fase tres, llamada establecimiento a través de la reproducción. Se sugiere aclaración sobre la temática “especie foránea” para evitar la degradación del ambiente con la introducción de peces foráneos en la región.	es-ES
dc.format	application/pdf
dc.language	eng
dc.publisher	Universidad de Costa Rica	en
dc.rights	Copyright (c) 2014 International Journal of Tropical Biology and Conservation	en
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 60 (3) September 2012	en
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 60 (3) September 2012	es-ES
dc.source	2215-2075
dc.source	0034-7744
dc.source	10.15517/rbt.v60i3
dc.subject	lepomis gibbosus	en
dc.subject	biological invasions	en
dc.subject	sunfish	en
dc.subject	reproductive biology	en
dc.subject	brazil	en
dc.subject	lepomis gibbosus	es-ES
dc.subject	invasiones biológicas	es-ES
dc.subject	pez sol	es-ES
dc.subject	biología reproductiva	es-ES
dc.subject	brasil	es-ES
dc.title	Reproduction of the non-native fish Lepomis gibbosus (Perciformes: Centrarchidae) in Brazil	en
dc.type	artículo original

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