Does sex influence intraspecific aggression and dominance in Nile tilapia juveniles?

Pinho-Neto, Cândido Ferreira; Miyai, Caio Akira; Sanches, Fábio Henrique Carretero; Giaquinto, Percília Cardoso; Delício, Helton Carlos; Barcellos, Leonardo José Gil; Volpato, Gilson Luiz; Barreto, Rodrigo Egydio

doi:10.1016/j.beproc.2014.02.003

Cited by 12 publications

(7 citation statements)

References 42 publications

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“…This is in accordance with results from McCarthy et al (1999) (Oliveira and Almada, 1996). This last experiment was done at the onset of sexual maturity, whereas the present study and the T. rendalli experiment were performed on juvenile and immature fish, which may explain the differences in hierarchy stability and this lack of sex effect, as described by Pinho-Neto et al (2014).…”

Section: Accepted Manuscriptsupporting

confidence: 93%

Agonistic behaviour and feed efficiency in juvenile Nile tilapia Oreochromis niloticus

et al. 2019

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Given the strong effects of behavioural hierarchies on growth in many cultured species and the key role of feed efficiency in aquaculture economics, understanding the nature of the interaction of these variables is important for the sustainability of aquaculture. The relationship between agonistic behaviour, growth and feed efficiency in Nile tilapia, Oreochromis niloticus, was studied by rearing 120 fish in eight aquaria. Fish were video-recorded to estimate the occurrence of agonistic behaviour during a fasting and a refeeding period. Growth, feed intake and feed conversion efficiency (FCE-calculated as the inverse of feed conversion ratio (FCR)) were subsequently measured individually for each fish. Fish showed 58% less agonistic traits during the fasting period compared to the feeding period, but generally, an aggressive fish during the fasting period was also aggressive during the refeeding period. The nature of agonistic behaviours between individuals was used to assess the presence of hierarchical relationships between fish. There were dominance hierarchies established in each experimental aquarium that despite minor shifts were maintained throughout the experiment. Agonistic behaviours were strongly correlated with each other, the aggression Index (AI) and with hierarchy rank. PCA analysis of the agonistic behaviours summarising the behavioural information showed little or no correlation between agonistic behaviour, fish growth or FCE. FCE was correlated with body weight gain (BWG). These results suggest that agonistic interactions in juvenile Nile tilapia do not have a large impact on growth and feed conversion efficiency. Highlights ► This is the first study to estimate agonistic behaviour, feed efficiency and growth at the individual on juvenile Nile tilapia reared in groups for an extended and continuous period of time. ► Estimates the relationships between agonistic behaviour, growth and feed efficiency in juvenile Nile tilapia. ► Hierarchical rank and agonistic behaviour do not affect Nile tilapia growth and feed efficiency. ► Aggressiveness and hierarchy are not good indicators of the feed efficiency in juvenile Nile tilapia when fish receive enough feed and using a dispersed feed supply.

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Section: Accepted Manuscriptsupporting

confidence: 93%

Agonistic behaviour and feed efficiency in juvenile Nile tilapia Oreochromis niloticus

et al. 2019

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“…We then evaluated the relationship of this index with different physiological parameters. Unlike most studies in which dominance relationships are evaluated in dyadic encounters (Fiszbein et al, 2010;Pinho-Neto et al, 2014;Oliveira et al, 2002;Tubert et al, 2012), this work analyzes the physiological aspects of social relationships within the context of a social group, which represents a more natural setting for this species.…”

Section: Accepted Manuscriptmentioning

confidence: 98%

A multidisciplinary study on social status and the relationship between inter-individual variation in hormone levels and agonistic behavior in a Neotropical cichlid fish

Ramallo

Birba

Honji

et al. 2015

Hormones and Behavior

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“…Similarly to other cichlids, Nile tilapia adult males and females show social-rank based interactions [24,25]. Juveniles also have a similar behavior to that of adults (e.g., [26,27]), however, it is probably due to a competition for food rather than for reproduction [28]. Depending on the context, social rank is kept among males through physical limits on the ground (territory and nest), as well as through different types of sensorial cues, such as visual [29,30], chemical [31], and acoustic ones [32,33] which counteract overt fights.…”

Section: Nile Tilapia Social Behaviormentioning

confidence: 99%

Social Behavior and Welfare in Nile Tilapia

Gonçalves-de-Freitas

Bolognesi

Gauy

et al. 2019

Fishes

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Fish social behavior can be affected by artificial environments, particularly by factors that act upon species that show aggressive behavior to set social rank hierarchy. Although aggressive interactions are part of the natural behavior in fish, if constant and intense, such interactions can cause severe body injuries, increase energy expenditure, and lead the animals to suffer from social stress. The immediate consequence of these factors is a reduced welfare in social fish species. In this paper, we consider the factors that impact on the social behavior and welfare of Nile tilapia, an African cichlid fish widely used both in fish farms and in research; this species is frequently used as a model for physiology and behavior research. This is a polygynous species whose males interact aggressively, establishing a territorial based hierarchy, where a dominant male and several subordinate males arise. When social stability is shrunk, the negative effects of prolonged fighting emerge. In this paper, we summarized how some of the common practices in aquaculture, such as classifying individuals by matching their sizes, water renewal, stock density, and environment lighting affect Nile tilapia social aggressive interactions and, in turn, impact on its welfare. We also discuss some ways to decrease the effects of aggressive interactions in Nile tilapia, such as environment color and body tactile stimulation.

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Does sex influence intraspecific aggression and dominance in Nile tilapia juveniles?

Cited by 12 publications

References 42 publications

Agonistic behaviour and feed efficiency in juvenile Nile tilapia Oreochromis niloticus

Agonistic behaviour and feed efficiency in juvenile Nile tilapia Oreochromis niloticus

A multidisciplinary study on social status and the relationship between inter-individual variation in hormone levels and agonistic behavior in a Neotropical cichlid fish

Social Behavior and Welfare in Nile Tilapia

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