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Identify of a tilapia pheromone released by dominant males that primes females ...
Keller-Costa, T.; Hubbard, Peter; Paetz, Christian; Nakamura, Yoko; Silva, José P. da; Rato, Ana; Barata, E. N.; Schneider, BerndKnowledge of the chemical identity and role of urinary pheromones in fish is scarce, yet necessary to understand the integration of multiple senses in adaptive responses and the evolution of chemical communication. In nature, Mozambique tilapia (Oreochromis mossambicus) males form hierarchies and females mate preferentially with dominant territorial males which they visit in aggregations or leks.
Adaptation to reduced salinity affects the olfactory sensitivity of Senegalese ...
Velez, Z.; Hubbard, Peter; Barata, E. N.; Canario, Adelino V. M.The Senegalese sole is a marine flatfish, which often penetrates into estuarine waters to feed. It cannot, however, survive in full freshwater. The current study investigated the effect of adaptation to low salinity (10‰) on olfactory responses to changes in environmental [Ca2+] and [Na+] and amino acids by the electro-encephalogram (EEG) recorded from the olfactory bulb. The sole showed olfactory responses to ...
Identification, release and olfactory detection of bile salts in the intestinal...
Velez, Z.; Hubbard, Peter; Welham, K.; Hardege, Jörg D.; Barata, E. N.; Canario, Adelino V. M.Olfactory sensitivity to bile salts is wide-spread in teleosts; however, which bile salts are released in suYcient quantities to be detected is unclear. The current study identiWed bile salts in the intestinal and bile Xuids of Solea senegalensis by mass spectrometry–liquid chromatography and assessed their olfactory potency by the electro-olfactogram.
Male urine signals social rank in the Mozambique tilapia (Oreochromis mossambicus)
Barata, E. N.; Hubbard, Peter; Almeida, O. G.; Miranda, A.; Canario, Adelino V. M.The urine of freshwater fish species investigated so far acts as a vehicle for reproductive pheromones affecting the behaviour and physiology of the opposite sex. However, the role of urinary pheromones in intra-sexual competition has received less attention. This is particularly relevant in lek-breeding species, such as the Mozambique tilapia (Oreochromis mossambicus), where males establish dominance hierarchi...
Olfactory discrimination of female reproductive status by male tilapia (Oreochr...
Miranda, A.; Almeida, O. G.; Hubbard, Peter; Barata, E. N.; Canario, Adelino V. M.The current study investigated whether discrimination of sexual status of female tilapia by males is mediated by olfaction. Size-matched groups of female tilapia were assigned as pre- or post-ovulatory according to the time since their last ovulation (15–19·days pre-ovulatory, N=7; 1–3·days post-ovulatory, N=8). Female-conditioned water and body fluids (urine, bile, faeces and plasma) were assessed for olfactor...
Olfactory sensitivity to changes in environmental Ca2 in the freshwater teleost...
Hubbard, Peter; Ingleton, P. M.; Bendell, L. A.; Barata, E. N.; Canario, Adelino V. M.Olfactory sensitivity to changes in environmental Ca2+ has been demonstrated in two teleost species; a salmonid (Oncorhynchus nerka) and a marine/estuarine perciform (Sparus aurata). To assess whether this phenomenon is restricted to species that normally experience large fluctuations in external ion concentrations (e.g. moving from sea water to fresh water) or is present in a much wider range of species, we in...
Olfactory sensitivity to changes in environmental [Ca2+] in the marine teleost ...
Hubbard, Peter; Barata, E. N.; Canario, Adelino V. M.Estuarine and/or migratory teleosts may experience large and rapid changes in external [Ca2+]. Previous studies have largely centred on the physiological mechanisms that maintain a constant plasma [Ca2+] in the face of such external fluctuations, but little work has been directed to examining how these changes may originally be detected. We present evidence that the olfactory system of the gilthead seabream (Sp...
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