caa a22 4500 469083565 CHVBK 20180323132958.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00328014 doi (NATIONALLICENCE)springer-10.1007/BF00328014 Postsmolt change in numbers of acetylcholinesterase-positive cells in the pineal organ of the Pacific coho salmon [Elektronische Daten] [Thomas Östholm, Peter Ekström, Sven Ebbesson] Summary: We have examined the occurrence of acetylcholinesterase (AChE)-positive cells in the pineal organ of different developmental stages of the Pacific coho salmon. Large numbers of AChE cells were present in fresh-water living alevins, in all stages of presmolts (n=307-544), and in adult spawners (n=696-1774) whereas seawater-living postmolts displayed a total lack of labeled cells. The AChE-reactive cells were evently distributed within the pineal end-vesicle and stalk of the presmolts and adults. However, the AChE-positive cells that occurred in the pineal stalk were of a smaller type and more uniform in shape than the cells of the pineal endvesicle. The dense populations of AChE-stained cells in the alevins, were all situated in the caudal part of the pineal end-vesicle. We conclude that changes in pineal metabolism occur in postsmolt salmon that liver in saltwater. It is not clear whether the observed change in pineal AChE expression is an "unspecific” change caused by life in the sea, reflecting alterations that are related to aspects of osmoregulation, and/or is involved in the visual function of the pineal organ resulting from changes in the environmental lighting conditions, e.g., photoperiod, light-intensity, or spectral composition. This study adds to our previous findings of changes that occur in the central nervous system of the salmon during the time of the parr-smolt transformation and migration between limnic and marine environments and indicates a possible central role of the pineal organ in the control of these events. Springer-Verlag, 1992 Acetylcholinesterase nationallicence Pineal organ nationallicence Parrsmolt transformation nationallicence Development, ontogenetic nationallicence Central nervous system nationallicence Oncorhynchus kisutch (Teleostei) nationallicence Östholm Thomas Seward Marine Center, Institute of Marine Science, University of Alaska Fairbanks, 99664, Seward, AK, USA aut Ekström Peter Department of Zoology, University of Lund, Helgonavägen 3, S-22362, Lund, Sweden aut Ebbesson Sven Seward Marine Center, Institute of Marine Science, University of Alaska Fairbanks, 99664, Seward, AK, USA aut Cell and Tissue Research Springer-Verlag 270/2(1992-11-01), 281-286 0302-766X 270:2<281 1992 270 441 https://doi.org/10.1007/BF00328014 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00328014 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Östholm Thomas Seward Marine Center, Institute of Marine Science, University of Alaska Fairbanks, 99664, Seward, AK, USA aut NATIONALLICENCE 700 1- Ekström Peter Department of Zoology, University of Lund, Helgonavägen 3, S-22362, Lund, Sweden aut NATIONALLICENCE 700 1- Ebbesson Sven Seward Marine Center, Institute of Marine Science, University of Alaska Fairbanks, 99664, Seward, AK, USA aut NATIONALLICENCE 773 0- Cell and Tissue Research Springer-Verlag 270/2(1992-11-01), 281-286 0302-766X 270:2<281 1992 270 441 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer