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Open AccessArticle

Gene Profiling in the Adipose Fin of Salmonid Fishes Supports Its Function as a Flow Sensor

1
Fish Genetics Unit, Institute for Genome Biology, Leibniz Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany
2
Professorship for Molecular Biology and Fish Genetics, Faculty of Agriculture and Environmental Sciences, University of Rostock, 18055 Rostock, Germany
*
Author to whom correspondence should be addressed.
Genes 2020, 11(1), 21; https://doi.org/10.3390/genes11010021
Received: 6 November 2019 / Revised: 13 December 2019 / Accepted: 17 December 2019 / Published: 23 December 2019
(This article belongs to the Special Issue Genetics and Genomics of Salmonid Fishes)
In stock enhancement and sea-ranching procedures, the adipose fin of hundreds of millions of salmonids is removed for marking purposes annually. However, recent studies proved the significance of the adipose fin as a flow sensor and attraction feature. In the present study, we profiled the specific expression of 20 neuron- and glial cell-marker genes in the adipose fin and seven other tissues (including dorsal and pectoral fin, brain, skin, muscle, head kidney, and liver) of the salmonid species rainbow trout Oncorhynchus mykiss and maraena whitefish Coregonus maraena. Moreover, we measured the transcript abundance of genes coding for 15 mechanoreceptive channel proteins from a variety of mechanoreceptors known in vertebrates. The overall expression patterns indicate the presence of the entire repertoire of neurons, glial cells and receptor proteins on the RNA level. This quantification suggests that the adipose fin contains considerable amounts of small nerve fibers with unmyelinated or slightly myelinated axons and most likely mechanoreceptive potential. The findings are consistent for both rainbow trout and maraena whitefish and support a previous hypothesis about the innervation and potential flow sensory function of the adipose fin. Moreover, our data suggest that the resection of the adipose fin has a stronger impact on the welfare of salmonid fish than previously assumed. View Full-Text
Keywords: adipose fin; fin-clipping; welfare; Oncorhynchus mykiss; Coregonus maraena; salmonids; mechanoreceptors; innervation adipose fin; fin-clipping; welfare; Oncorhynchus mykiss; Coregonus maraena; salmonids; mechanoreceptors; innervation
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MDPI and ACS Style

Koll, R.; Martorell Ribera, J.; Brunner, R.M.; Rebl, A.; Goldammer, T. Gene Profiling in the Adipose Fin of Salmonid Fishes Supports Its Function as a Flow Sensor. Genes 2020, 11, 21.

AMA Style

Koll R, Martorell Ribera J, Brunner RM, Rebl A, Goldammer T. Gene Profiling in the Adipose Fin of Salmonid Fishes Supports Its Function as a Flow Sensor. Genes. 2020; 11(1):21.

Chicago/Turabian Style

Koll, Raphael; Martorell Ribera, Joan; Brunner, Ronald M.; Rebl, Alexander; Goldammer, Tom. 2020. "Gene Profiling in the Adipose Fin of Salmonid Fishes Supports Its Function as a Flow Sensor" Genes 11, no. 1: 21.

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