Tine Valentinčič

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Catfish, described as 'swimming tongues', are unique experimental models for studies of taste reception because of the extensive distribution of taste buds over their external body surface and within their oropharyngeal cavity. Both the extraordinary numbers of taste buds and their high sensitivity to amino acids have made it possible to perform in the same(More)
Channel catfish, maintained individually in aquaria with dark substrate, responded to visual stimuli from above with escape behavior and to amino acid stimuli with feeding behavior. Feeding behavior was composed of a) appetitive patterns, such as barbel movements, orienting posture, and search swimming and b) consummatory patterns that included a halt in(More)
Olfactory discrimination of amino acids was investigated in brown bullhead catfish (Ameiurus nebulosus). Based on the magnitude of the observed food search activity of catfish conditioned to single amino acids, the tested compounds were classified as being detected by the catfish as equal to, similar to, or different from the conditioned stimulus. L-Proline(More)
Intact channel catfish conditioned to the L-amino acids, proline, arginine, alanine, and lysine, discriminated these stimuli from all other amino acids tested. Behavioral structure-activity tests indicated that L-pipecolate was the only effective agonist of the L-proline conditioned response. For channel catfish in which one of the paired olfactory organs(More)
The entire sequence of feeding behavior patterns exhibited by intact and anosmic channel catfish to food extracts was also released by single amino acids. L-arginine (> 10(-6) M), L-alanine (> 10(-6) M), and L-proline (> 10(-4) M) were each highly effective at releasing consummatory behavior patterns, such as turning, increasing pumping of water across the(More)
The question of whether a binary mixture of amino acids is detected by fish as a unique odor or whether the qualities of the individual components are retained within the mixture was investigated in channel (Ictalurus punctatus) and brown bullhead (Ameiurus nebulosus) catfish, species that are highly similar in their olfactory receptor and behavioral(More)
Feeding behavior of adult rainbow trout (Oncorhynchus mykiss) is released by visual and/or chemical stimuli. Detection of either a conditioned visual or a conditioned chemical stimulus creates an excitatory feeding state within the central nervous system which turns on feeding behavior composed of swimming, turning and biting/snapping actions. Particular(More)
On the basis of previous findings of behavioural discrimination of amino acids and on the knowledge of electrophysiology of the catfish (genera Ictalurus and Ameiurus) olfactory organs, behavioural experiments that investigated olfactory discrimination of amino acid mixtures were carried out on the black bullhead Ameiurus melas. Repeated presentations of(More)
We recorded simultaneously the electrophysiological responses of the olfactory organ [the electroolfactogram (EOG)] and action potential activity of single olfactory receptor neurons (ORNs) to amino acid stimuli in the brown bullhead catfish, Ameiurus nebulosus. To determine whether the amplitude of the EOG depends upon the number of responding ORNs, we(More)