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Dorsal hump morphology in pink salmon (Oncorhynchus gorbuscha)

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Title: Dorsal hump morphology in pink salmon (Oncorhynchus gorbuscha)
Authors: Susuki, Kenta Browse this author
Ichimura, Masaki Browse this author
Koshino, Yosuke Browse this author
Kaeriyama, Masahide Browse this author →KAKEN DB
Takagi, Yasuaki Browse this author →KAKEN DB
Adachi, Shinji Browse this author →KAKEN DB
Kudo, Hideaki Browse this author →KAKEN DB
Keywords: pink salmon
dorsal hump
connective tissue
secondary sexual characteristic
Issue Date: May-2014
Journal Title: Journal of Morphology
Volume: 275
Issue: 5
Start Page: 514
End Page: 527
Publisher DOI: 10.1002/jmor.20234
PMID: 24323872
Abstract: Mature male Pacific salmon (Genus Oncorhynchus) develop a dorsal hump, as a secondary male sexual characteristic, during the spawning period. Previous gross anatomical studies have indicated that the dorsal humps of salmon are mainly composed of cartilaginous tissue (Davidson, 1935). However, the histological and biochemical characteristics of such humps are poorly understood. In this study, the detailed microstructures and components of the dorsal humps of pink salmon (O. gorbuscha) were analyzed using histochemical techniques and electrophoresis. In mature males, free interneural spines and neural spines were located in a line near to the median septum of the dorsal hump. No cartilaginous tissue was detected within the dorsal hump. Fibrous and mucous connective tissues were mainly found in three regions of the dorsal hump: i) the median septum, ii) the distal region, and iii) the crescent-shaped region. Both the median septum and distal region consisted of connective tissue with a high water content, which contained elastic fibers and hyaluronic acid. It was also demonstrated that the lipid content of the dorsal hump connective tissue was markedly decreased in the mature males compared with the immature and maturing males. Although, the crescent-shaped region of the hump consisted of connective tissue, it did not contain elastic fibers, hyaluronic acid, or lipids. In an ultrastructural examination, it was found that all of the connective tissues in the dorsal hump were composed of collagen fibers. Gel electrophoresis of collagen extracts from these tissues found that the collagen in the dorsal hump is composed of type I collagen, as is the case in salmon skin. These results indicate that in male pink salmon the dorsal hump is formed as a result of an increase in the amount of connective tissue, rather than cartilage, and the growth of free interneural spines and neural spines.
Rights: This is the peer reviewed version of the following article: Journal of morphology, 2014, 275(5), p.514-527, which has been published in final form at 10.1002/jmor.20234. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 秀明

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