Morphological and physiological studies on the olfactory organ of the striped eel catfish,Plotosus lineatus |
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| Authors: | B Theisen E Zeiske W L Silver T Marui J Caprio |
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| Institution: | (1) Institute of Cell Biology and Anatomy, Copenhagen University, Universitetsparken 15, DK-2100 Copenhagen, Denmark;(2) Zoologisches Institut und Zoologisches Museum, Hamburg University, Hamburg, Germany;(3) Department of Biology, Wake Forest University, 27109 Winston-Salem, North Carolina, USA;(4) Department of Oral Physiology, Kagoshima Dental School, 890 Usuki-cho, Kagoshima, Japan;(5) Department of Zoology and Physiology, Louisiana State University, 70803 Baton Rouge, Louisiana, USA |
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| Abstract: | The olfactory organ of the striped eel catfish,Plotosus lineatus (Thunberg), obtained off Kyushu Island, Japan, was examined both morphologically and electrophysiologically. The olfactory organ ofP. lineatus differs from that of most other catfishes, possessing a small olfactory rosette containing only relatively few lamellae, a well-developed olfactory ventilation sac used as the primary means of propelling water through the olfactory chamber, and olfactory sensory epithelia lying in discrete patches rather than continuously distributed across the lamellae. Although morphological differences in the olfactory organ betweenP. lineatus and other catfishes are significant, the physiological characteristics are remarkably similar. Response thresholds for amino acids (L-cysteine and L-glutamine) were ca. 10–9
M, and the relative effectiveness of 16 amino-acid stimuli differed little from those reported for other catfishes. |
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