Effect of water renewal on dominance hierarchy of juvenile Nile tilapia

Gonçalves-de-Freitas, Eliane; Teresa, Fabrício Barreto; Gomes, Fernanda Sgarbosa; Giaquinto, Percília Cardoso

doi:10.1016/j.applanim.2007.07.002

Cited by 59 publications

(50 citation statements)

References 33 publications

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“…Although chemical communication did not affect Nile tilapia's reproductive behavior, rank signaling has been reported to be mediated by chemical cues in this species (38,39). This suggests that cichlid visual and chemical information seems to be important at different moments of fish life.…”

Section: Discussionmentioning

confidence: 87%

Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Castro

Gonçalves-de-Freitas

Volpato

et al. 2009

Braz J Med Biol Res

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Reproductive fish behavior is affected by male-female interactions that stimulate physiological responses such as hormonal release and gonad development. During male-female interactions, visual and chemical communication can modulate fish reproduction. The aim of the present study was to test the effect of visual and chemical male-female interaction on the gonad development and reproductive behavior of the cichlid fish Nile tilapia, Oreochromis niloticus (L.). Fifty-six pairs were studied after being maintained for 5 days under one of the four conditions (N = 14 for each condition): 1) visual contact (V); 2) chemical contact (Ch); 3) chemical and visual contact (Ch+V); 4) no sensory contact (Iso) -males and females isolated. We compared the reproductive behavior (nesting, courtship and spawning) and gonadosomatic index (GSI) of pairs of fish under all four conditions. Visual communication enhanced the frequency of courtship in males (mean ± SEM; V: 24.79 ± 3.30, Ch+V: 20.74 ± 3.09, Ch: 0.1 ± 0.07, Iso: 4.68 ± 1.26 events/30 min; P < 0.05, two-way ANOVA with LSD post hoc test), induced spawning in females (3 spawning in V and also 3 in Ch+V condition), and increased GSI in males (mean ± SEM; V: 1.39 ± 0.08, Ch+V: 1.21 ± 0.08, Ch: 1.04 ± 0.07, Iso: 0.82 ± 0.07%; P < 0.05, two-way ANOVA with LSD post hoc test). Chemical communication did not affect the reproductive behavior of pairs nor did it enhance the effects of visual contact. Therefore, male-female visual communication is an effective cue, which stimulates reproduction among pairs of Nile tilapia.

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Section: Discussionmentioning

confidence: 87%

Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Castro

Gonçalves-de-Freitas

Volpato

et al. 2009

Braz J Med Biol Res

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“…For example, recirculation apparently concentrates attack eliciting cues and increases levels of aggression in juvenile Atlantic salmon; in this case, use of flow through systems might prevent such effects (Griffiths & Armstrong 2000). In contrast, water-borne chemicals decrease levels of aggression in pairs of Nile tilapia, possibly because they allow recognition of familiar individuals; fish held in pairs fight more when a continuous flow of water removes such cues, (Giaquinto & Volpato 1997), mainly due to increased aggressiveness in the subordinate fish (Gonçalves de Freitas et al 2008). So, recirculation might decreases the problem of aggression, but large Nile tilapia can show growth retardation in recirculation systems, which allow waterborne substances to accumulate (Martins et al 2009).…”

Section: Manipulating Stimuli Experienced By Cultured Fishmentioning

confidence: 99%

Fighting and Aggression

Damsgård¹,

Huntingford²

2012

Aquaculture and Behavior

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Aggression (behaviour that actually or potentially causes harm to another animal) is widespread among fishes, often taking the form of territoriality or dominance. The mechanisms that control aggression in fish are described, including the effects of stimuli from opponents, the importance of the context in which an aggressive encounter occurs and the effects of nutritional condition, endocrine status and brain biochemistry. The way aggression changes during development is then considered, evidence given for inherited differences in aggressiveness and an account presented of the environmental factors that influence the way aggression develops. The benefits that fish gain from winning fights, the costs that they incur from fighting and how they balance costs against benefits to promote their individual fitness are described. Data are then given on the incidence of aggression among cultured fish, on some resulting problems for production, welfare and environmental protection and on the effects of domestication and captive rearing of aggressiveness. Possible solutions to such problems are discussed, based on selecting appropriate fish for culture and the design of husbandry systems that minimise aggression. Finally, some systems for mitigating the effects of domestication and captive rearing on the aggressive behaviour of cultured fish are described.

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“…Dominance hierarchy was identified by estimating the dominance index: DI = fish directed attacks/total number of aggressive interactions in the pair (Gómez-LaPlaza & Morgan, 1993;Gonçalves-de-Freitas et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

Environmental enrichment reduces aggression of pearl cichlid, Geophagus brasiliensis, during resident-intruder interactions

Kadry

Barreto

2010

Neotrop. ichthyol.

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Among fishes, when residents and intruders fight, residents usually win, most likely because they value the residence more than intruders. We hypothesized that enriched environments increase the value of an area in dispute, causing a resident to more fiercely defend a resource-rich environment than a poor one. However, in the present study, intruder-resident tests with the pearl cichlid, Geophagus brasiliensis, showed environmental enrichment actually reduces aggression and can even lead to co-habitation without fighting. Additionally, in our experiments, the prior residence effect occurred irrespective of enrichment condition. Decreased visibility from increased habitat complexity reduces interactions between fish and consequently might explain the lower aggression observed herein.Em lutas entre peixes residentes e intrusos, residentes geralmente vencem, provavelmente porque valorizam o território mais do que os intrusos. Nós aventamos a hipótese de que ambientes enriquecidos aumentam o valor da área em disputa, levando os residentes a defenderem mais violentamente ambientes enriquecidos de recursos do que ambientes empobrecidos, pois possuiriam mais motivação para mantê-lo. No entanto, no presente estudo, ao testarmos as interações entre intrusos e residentes em acarás, Geophagus brasiliensis, observamos que o enriquecimento ambiental reduz a agressividade e pode levar a cohabitação entre os peixes, sem luta. Adicionalmente, em nossos experimentos, o efeito da residência prévia ocorreu independente da condição de enriquecimento. A diminuição das interações entre os peixes e, consequentemente, a diminuição do nível de agressividade é aqui atribuída aos efeitos da diminuição da visibilidade entre os peixes devido ao aumento de complexidade do ambiente.

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Effect of water renewal on dominance hierarchy of juvenile Nile tilapia

Cited by 59 publications

References 33 publications

Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)

Fighting and Aggression

Environmental enrichment reduces aggression of pearl cichlid, Geophagus brasiliensis, during resident-intruder interactions

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