2008
DOI: 10.1590/s1519-69842008000400015
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Abstract: We tested whether the fish Nile tilapia (Oreochromis niloticus) in a monosex male group spends more energy and displays an agonistic profile, differently from males in male-female groups. Such differences are expected because males and females should compete for different reproductive resources. An intruder male (MM) or female (MF) was paired with a resident male and agonistic interaction was quantified during 20 minutes, 10 minutes after pairing and another 10 minutes period 30 minutes later. Energetic cost w… Show more

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Cited by 18 publications
(12 citation statements)
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References 17 publications
(21 reference statements)
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“…CARVALHO et al (2012) found that juvenile Nile tilapias have less motivation to fight under conditions of intense light. It is possible that juveniles are less aggressive when light is intense because they need to reduce predation risk, whereas adults need to defend their territory and attract females under those conditions (CARVALHO et al 2008). Studies on the behavior of the different life stages and the effect of melatonin on fish aggressive behavior, however, are rare in the literature.…”
Section: Discussionmentioning
confidence: 99%
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“…CARVALHO et al (2012) found that juvenile Nile tilapias have less motivation to fight under conditions of intense light. It is possible that juveniles are less aggressive when light is intense because they need to reduce predation risk, whereas adults need to defend their territory and attract females under those conditions (CARVALHO et al 2008). Studies on the behavior of the different life stages and the effect of melatonin on fish aggressive behavior, however, are rare in the literature.…”
Section: Discussionmentioning
confidence: 99%
“…In fact, several biotic and abiotic factors affect the aggressive interaction and dominance hierarchy, for instance, the same-sized fish group (BOSCOLO et al 2011), the sex group composition (CARVALHO & GONÇALVES-DE-FREITAS 2011), the availability of shelters (KADRY & BARRETO 2010), the concentration of oxygen (SNEDDON & YERBURY 2004), and the water level (GONÇALVES-DE-FREITAS et al 2008). However, the effect of light intensity on the aggressive behavior was not sufficient to make the hierarchy unstable.…”
Section: Discussionmentioning
confidence: 99%
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“…The 3-cm high barrier on the longitudinal axis at the bottom of the tanks could have provoked latent territorial behavior. Carvalho and Gonçalves-De-Freitas (2008) stated that Nile tilapia is territorial and exhibits a social hierarchy established by aggressive interactions. Social dominance relationships can increase social stress as a result of increased aggressive interactions, interfering with reproduction, growth, and metabolic rate (Carvalho, Ha, & Gonçalves-De-Freitas, 2012).…”
Section: Discussionmentioning
confidence: 99%