AI Article Synopsis
- Anadromous Pacific salmon imprint on odors from their birth streams during migration and use their sense of smell to navigate home.
- The development and structure of the olfactory organ, crucial for this imprinting, were studied in chum salmon, specifically looking at changes in olfactory lamellae and olfactory receptor neurons (ORNs) from alevin to maturity.
- The research found that the number of lamellae increased significantly during early development and that the number of ORNs grows dramatically from about 180,000 in fry to 14.2 million in mature salmon, demonstrating a relationship between body size and olfactory neuron quantity throughout their life cycle.
Article 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.
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| http://dx.doi.org/10.1093/chemse/bjp042 | DOI Listing |
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