Muscular hypertrophy of urinary bladders in dominant tilapia facilitates the control of aggression through urinary signals

  title={Muscular hypertrophy of urinary bladders in dominant tilapia facilitates the control of aggression through urinary signals},
  author={Tina Keller-Costa and Orlando Lopes and Olinda G Almeida and Peter C. Hubbard and Anna Iacovella and M{\'o}nica Lima and Eduardo N. Barata and Adelino V. M. Can{\'a}rio},
The urination pattern of the Mozambique tilapia (Oreochromis mossambicus) depends on social context, and the olfactory potency of urine released depends on social rank (males) and reproductive status (females). This strongly suggests that urine mediates chemical communication in this species. The current study tested, firstly, whether urine production rate depends on sex or social status and, secondly, whether differences in urination pattern and volume of urine stored are associated with… 

Tilapia male urinary pheromone stimulates female reproductive axis.

Analysis of Male Urine as Pheromone to Increase Reproduction in Female Tiger Grouper (Epinephelus Fuscoquttatus)

From the results of this study, it could be concluded that male urine of tiger grouper was a pheromone that could increase the stimulation and gonad maturity of female broodstock.

Variation in Urinary Amino Acids in the Mozambique Tilapia: A Potential Signal of Dominance or Individuality?

The urine of male tilapia (Oreochromis mossambicus) contains a pheromone which is—at least in part—composed of two steroid glucuronates. However, the polar fraction of urine (not containing steroids)

Chemical communication in the Mozambique tilapia: a role for amino acids

The Mozambique tilapia ( Oreochromis mossambicus) is a maternal mouth-brooding cichlid from the southern Africa and the olfactory sensitivity and correlations between amino acid concentration and hierarchical status were explored.

To pee or not to pee: urine signals mediate aggressive interactions in the cooperatively breeding cichlid Neolamprologus pulcher

Chemical communication plays a crucial role in multimodal communication of aggression in these fish, which highlights the need of studying the role of chemical communication during agonistic encounters in general, even if other signals are more obvious to the human observer.

Chemical communication in cichlids: A mini-review.



Male urine signals social rank in the Mozambique tilapia (Oreochromis mossambicus)

It is suggested that males actively advertise their dominant status through urinary odorants which may act as a 'dominance' pheromone to modulate aggression in rivals, thereby contributing to social stability within the lek.

A Sterol-Like Odorant in the Urine of Mozambique Tilapia Males Likely Signals Social Dominance to Females

It is suggested that dominant/territorial tilapia males dramatically increase urination frequency in the presence of females ready to spawn and that the urinary odorant acts as a pheromonal signal of dominance, thereby influencing female spawning.

Olfactory discrimination of female reproductive status by male tilapia (Oreochromis mossambicus)

The ability of male tilapia to discriminate between females of differing reproductive status is mediated by odorants released into the water, probably via the urine and faeces, by pre-ovulatory females.

Social Modulation of Sex Steroid Concentrations in the Urine of Male Cichlid FishOreochromis mossambicus

Social interactions may have an important modulatory effect on sex steroid concentrations in Cichlid fish Oreochromis mossambicus.

Contextual chemosensory urine signaling in an African cichlid fish

The hypothesis that dominant males of African cichlid fish use urine as a chemical signal and adjust the frequency of their urine output based on contextual information is supported.

Unravelling the chemical basis of competitive scent marking in house mice

Competitive countermarking is stimulated by proteins or by nonvolatile protein-ligand complexes in male urine, while release of volatile ligands attracts attention to a competitor's scent marks.

Urine release in freely moving catheterised lobsters (Homarus americanus) with reference to feeding and social activities.

The data demonstrate that lobsters control their urine release in a manner dependent on behavioural context, which supports recent findings suggesting the use of urine for chemical signalling in agonistic interactions.

Rates of urine excretion by house mouse (Mus domesticus): Differences by age, sex, social status, and reproductive condition

Test hypotheses about factors affecting excreted urine output per day in male and female house mice (Mus domesticus) found that males in estrus produce more urine than females in diestrus, but there are no similar effects for female mice.