47 documents found, page 1 of 5
A multi-component pheromone in the urine of dominant male tilapia (Oreochromis ...
Keller-Costa, Tina; Saraiva, João L.; Hubbard, Peter C.; Barata, Eduardo N.; Canário, Adelino V. M.Males often use scent to communicate their domi- nance, and to mediate aggressive and breeding behaviors. In teleost fish, however, the chemical composition of male pher- omones is poorly understood. Male Mozambique tilapia, Oreochromis mossambicus, use urine that signals social status and primes females to spawn. The urinary sex pheromone di- rected at females consists of 5β-pregnane-3α,17α,20β-triol 3- glucur...
Identity of a Tilapia Pheromone Released by Dominant Males that Primes Females ...
Keller-Costa, Tina; Hubbard, Peter C.; Paetz, Christian; Nakamura, Yoko; da Silva, José P.; Rato, A.E.; Barata, Eduardo N.; Schneider, BerndKnowledge of the chemical identity and role of urinary pheromones in fish is scarce, yet it is necessary in order to understand the integration of multiple senses in adaptive responses and the evolution of chemical communication [1]. In nature, Mozambique tilapia (Oreochromis mossambicus) males form hierarchies, and females mate preferentially with dominant territorial males, which they visit in aggregations or...
Social odors conveying dominance and reproductive information induce rapid phys...
Simões, José M.; Barata, Eduardo N.; Harris, Rayna M.; O’Connell, Lauren A.; Hofmann, Hans A.; Oliveira, Rui F.Background: Social plasticity is a pervasive feature of animal behavior. Animals adjust the expression of their social behavior to the daily changes in social life and to transitions between life-history stages, and this ability has an impact in their Darwinian fitness. This behavioral plasticity may be achieved either by rewiring or by biochemically switching nodes of the neural network underlying social behav...
Olfactory transduction pathways in the Senegalese sole Solea senegalensis
Velez, Zélia; Hubbard, Peter C.; Barata, Eduardo N.; Canário, Adelino V.M.This study tested whether differences in sensitivity between the upper and lower olfactory epithelia of Solea senegalensis are associated with different odorant receptors and transduction pathways, using the electro-olfactogram. Receptor mechanisms were assessed by cross-adaptation with amino acids (L-cysteine, L-phenylalanine and 1-methyl-L-tryptophan) and bile acids (taurocholic acid and cholic acid). This su...
Muscular hypertrophy of urinary bladders in dominant tilapia facilitates the co...
Keller-Costa, Tina; Lopes, Orlando; Almeida, Olinda; Hubbard, Peter C.; Iacovella, Adele; Lima, Monica; Barata, Eduardo N.; Canário, Adelino V.M.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 d...
Olfactory sensitivity to amino acids in the blackspot sea bream (Pagellus bogar...
Hubbard, Peter C.; Barata, Eduardo N.; Ozório, Rodrigo O. A.; Valente, Luisa M. P.; Canário, Adelino V. M.The current study investigated the olfactory sensitivity of the blackspot sea bream to amino acids, odorants associated with food detection in fsh, and compared the efficacy of two different experimental methods: multiunit recording from the olfactory nerve and the electro-olfactogram (EOG). Twenty essential amino acids plus L-DOPA evoked clear, concentration-dependent olfactory responses using both methods, wi...
Aditivos Alimentares para Aquicultura e Aquaricultura e Respectiva Utilização
Barata, Eduardo N.A presente invenção consiste em aditivos alimentares para aquicultura e aquaricultura. Estes aditivos compreendem, na sua composição um amino ácido, o metil-L-triptofano ou os seus isómeros, com o objectivo de melhorar a apetência dos alimentos utilizados em aquicultura e aquaricultura, tanto em peixes como em outros organismos aquáticos quando em cultura. Desta forma, o objectivo da presente invenção tem aplic...
Evidence that 1-methyl-L-tryptophan is a food-related odorant for the Senegales...
Barata, Eduardo N.; Velez, ZéliaNocturnal animals often rely heavily on olfactory cues to locate their food. This is especially true for fish whose prey live buried in the substrate. The aim of the current study was to identify odorants released by the ragworm (Hediste diversicolor) that are detected by the olfactory system of the Senegalese sole (Solea senegalensis) and therefore may be food-related cues. Ragworm-conditioned water was passed...
Feed Additives for Aquaculture and Aquarium Culture
Barata, Eduardo N.; Velez, ZéliaThe presente invention refers of feed additives for aquaculture and aquarium culture. These additives comprise the amino acid, 1-methyl-L-tryptophane, or its isomers with the objective of improving the attractiveness of feeds used in aquaculture and aquaria for fish, as well as other aquatic organisms, under culture conditions. Therefore, this invention has applications in the agriculture-food industry.
26th Annual Meeting of the International Society of Chemical Ecology
Keller, Tina; Barata, Eduardo N.The Mozambique tilapia is a lek-breeding cichlid wherein males establish dominance hierarchies and visiting females mate preferentially with dominant territorial males. Dominant males increase urination frequency during courtship and aggression (1). A sulphated aminosterol urinary odorant for females has been suggested to act as pheromonal signal of dominance, thereby influencing female spawning (1). Here, we a...