Environmental color affects Nile tilapia reproduction

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dc.contributor.authorVolpato, Gilson Luiz [UNESP]
dc.contributor.authorDuarte, C.R.A. [UNESP]
dc.contributor.authorLuchiari, A.C. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:11:33Z
dc.date.available2014-05-20T15:11:33Z
dc.date.issued2004-04-01
dc.description.abstractWe investigated the effects of environmental color on the reproductive behavior of Nile tilapia, Oreochromis niloticus. Two environmental colors were tested by covering the aquarium (60 x 60 x 40 cm) with white (12 groups) or blue (13 groups) cellophane and observing reproductive behavior in groups of 2 males (10.27 ± 0.45 cm) and 3 females (10.78 ± 0.45 cm) each. After assignment to the respective environmental color (similar luminosity = 100 to 120 Lux), the animals were observed until reproduction (identified by eggs in the female's mouth) or up to 10 days after the first nest building. Photoperiod was from 6:00 h to 18:00 h every day. Food was offered in excess once a day and water quality was similar among aquaria. Daily observations were made at 8:00, 11:00, 14:00 and 17:00 h regarding: a) latency to the first nest, b) number of nests, c) gravel weight removed (the male excavates the nest in the bottom of the aquarium), d) nest area, and e) mouthbrooding incubation (indication of reproduction). The proportion of reproducing fish was significantly higher (6 of 13) in the group exposed to the blue color compared the group exposed to the white color (1 of 12; Goodman's test of proportions). Moreover, males under blue light removed significantly larger masses of gravel (blue = 310.70 ± 343.50 g > white = 130.38 ± 102.70 g; P = 0.01) and constructed wider nests (blue = 207.93 ± 207.80 cm² > white = 97.68 ± 70.64 cm²; P = 0.03) than the control (white). The other parameters did not differ significantly between light conditions. We concluded that reproduction in the presence of blue light was more frequent and intense than in the presence of white light.en
dc.description.affiliationUniversidade Estadual Paulista Instituto de Biociências Departamento de Fisiologia
dc.description.affiliationUnespUniversidade Estadual Paulista Instituto de Biociências Departamento de Fisiologia
dc.format.extent479-483
dc.identifierhttp://dx.doi.org/10.1590/S0100-879X2004000400004
dc.identifier.citationBrazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 37, n. 4, p. 479-483, 2004.
dc.identifier.doi10.1590/S0100-879X2004000400004
dc.identifier.fileS0100-879X2004000400004.pdf
dc.identifier.issn0100-879X
dc.identifier.lattes3363114201357959
dc.identifier.scieloS0100-879X2004000400004
dc.identifier.urihttp://hdl.handle.net/11449/28075
dc.language.isoeng
dc.publisherAssociação Brasileira de Divulgação Científica (ABRADIC)
dc.relation.ispartofBrazilian Journal of Medical and Biological Research
dc.relation.ispartofjcr1.492
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectReproductionen
dc.subjectEnvironmental coloren
dc.subjectFishen
dc.subjectNile tilapiaen
dc.subjectOreochromis niloticusen
dc.titleEnvironmental color affects Nile tilapia reproductionen
dc.typeArtigo
unesp.author.lattes3363114201357959
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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Artigos - Fisiologia - IBB