Skin Spotting Variation Associated with Biometric and Reproductive Parameters in Naturalized Populations of Rainbow Trout, , from Southern Chile

Colihueque, Nelson; Estay, Francisco Javier; Yáñez, Miguel

Skin Spotting Variation Associated with Biometric and Reproductive Parameters in Naturalized Populations of Rainbow Trout, Oncorhynchus mykiss, from Southern Chile

Nelson Colihueque^{1, *}, Francisco Javier Estay², Miguel Yáñez³

¹ Departamento de Ciencias Biológicas y Biodiversidad, Universidad de Los Lagos, Osorno, Chile

² Piscícola Huililco Ltda., Pucón, Chile

³ Departamento de Estadística, Universidad del Bío-Bío, Concepción, Chile

Article Information

Identifiers and Pagination:

Year: 2018
Volume: 11
First Page: 25
Last Page: 37
Publisher Id: TOECOLJ-11-25
DOI: 10.2174/1874213001811010025

Article History:

Received Date: 13/11/2017
Revision Received Date: 08/02/2018
Acceptance Date: 08/02/2018
Electronic publication date: 09/03/2018
Collection year: 2018

© 2018 Colihueque et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

^* Address correspondence to this author at the Departamento de Ciencias Biológicas y Biodiversidad, Universidad de Los Lagos, Av. Alcalde Fuchslocher 1305, Casilla 933, Osorno, Chile; Tel: 56-64-2333131; Fax: 56-64-2333455; E-mail: ncolih@ulagos.cl

Background:

Skin pigmentation in fish is involved in various biological processes. In salmonids, the interactions of skin spottiness with biometric and reproductive parameters are mostly unknown, especially in naturalized populations influenced by different ecological factors.

Objective:

To associate skin spottiness variation with biometric and reproductive parameters in broodstocks of naturalized rainbow trout populations from southern Chile.

Method:

The number of dark spots below the lateral line was assessed in male and female broodstocks of rainbow trout from two reproductive seasons, years 2007 and 2012, and then this dataset was associated with biometric and reproductive parameters of the same individuals, using multivariate data analysis in the form of stepwise forward multiple regression.

Results:

Male body weight from year 2007 had a significant negative influence on the number of dark spots below the lateral line (P < 0.01), while the reproductive variables egg diameter and spawning time of females from years 2007 and 2012, respectively, had a significant positive influence on this parameter (P < 0.01).

Conclusion:

Our results indicate that there are male biometric parameters with a significant negative influence on skin spottiness. Our data also reveal that some reproductive parameters have a positive influence on skin spottiness. The identification of these reproductive parameters related to spottiness variation would reflect the reproductive quality of female broodstocks living in natural environments.

Keywords: Rainbow trout, Naturalized population, Skin spottiness, Biometry, Reproduction, Multiple regression.

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RESEARCH ARTICLE

Skin Spotting Variation Associated with Biometric and Reproductive Parameters in Naturalized Populations of Rainbow Trout, Oncorhynchus mykiss, from Southern Chile

Article Information

Identifiers and Pagination:

Article History:

Abstract

Background:

Objective:

Method:

Results:

Conclusion:

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