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Chemical Senses Advance Access originally published online on July 8, 2009
Chemical Senses 2009 34(7):617-624; doi:10.1093/chemse/bjp042
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Morphometry of Olfactory Lamellae and Olfactory Receptor Neurons During the Life History of Chum Salmon (Oncorhynchus keta)

Hideaki Kudo1, Masakazu Shinto1, Yasunori Sakurai2 and Masahide Kaeriyama1

1 Laboratory of Strategic Studies on Marine Bioresource Conservation and Management, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan 2 Laboratory of Marine Ecology, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan

Correspondence to be sent to: Hideaki Kudo, Faculty of Fisheries Sciences, Hokkaido University, 3-1-1, Minato-cho, Hakodate 041-8611, Japan. e-mail:hidea-k{at}fish.hokudai.ac.jp


  Abstract

It is generally accepted that anadromous Pacific salmon (genus Oncorhynchus) imprint to odorants in their natal streams during their seaward migration and use olfaction to identify these during their homeward migration. Despite the importance of the olfactory organ during olfactory imprinting, the development of this structure is not well understood in Pacific salmon. Olfactory cues from the environment are relayed to the brain by the olfactory receptor neurons (ORNs) in the olfactory organ. Thus, we analyzed morphometric changes in olfactory lamellae of the peripheral olfactory organ and in the quantity of ORNs during life history from alevin to mature in chum salmon (Oncorhynchus keta). The number of lamellae increased markedly during early development, reached 18 lamellae per unilateral peripheral olfactory organ in young salmon with a 200 mm in body size, and maintained this lamellar complement after young period. The number of ORNs per olfactory organ was about 180 000 and 14.2 million cells in fry and mature salmon, respectively. The relationship between the body size (fork length) and number of ORNs therefore revealed an allometric association. Our results represent the first quantitative analysis of the number of ORNs in Pacific salmon and suggest that the number of ORNs is synchronized with the fork length throughout its life history.

Key words: development, migration, olfactory lamella, olfactory receptor neuron, salmon

Accepted 18 June 2009


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