Effects of Hatchery Rearing on Brain Structures of Rainbow Trout, Oncorhynchus mykiss

SMC Author

Michael Marchetti

SMC Affiliated Work

1

Status

Faculty

School

School of Science

Department

Environmental and Earth Science

Document Type

Article

Publication Date

1-2003

Publication / Conference / Sponsorship

Environmental Biology of Fishes

Description/Abstract

In this study, we contrast brain morphology from hatchery and wild reared stocks to examine the hypothesis that in salmonid fishes, captive rearing produces changes in brain development. Using rainbow trout, Oncorhynchus mykiss, as a model, we measured eight regions of the salmonid brain to examine differences between wild and hatchery reared fish. We find using multiple analysis of covariance (MANCOVA), analysis of covariance (ANCOVA) and discriminant function analysis (DFA) that the brains of hatchery reared fish are relatively smaller in several critical measures than their wild counterparts. Our work may suggest a mechanistic basis for the observed vulnerability of hatchery fish to predation and their general low survival upon release into the wild. Our results are the first to highlight the effects of hatchery rearing on changes in brain development inbreak fishes.

Keywords

salmonidae, domestic fishes, brain size, neurobiology, conservation, discriminant function analysis

Scholarly

yes

DOI

10.1023/A:1023269221678

Volume

66

Issue

1

First Page

9

Last Page

14

Disciplines

Earth Sciences | Environmental Sciences

Original Citation

Marchetti, M.P. and Nevitt, G.A. January 2003. Effects of Hatchery Rearing on Brain Structures of Rainbow Trout, Oncorhynchus mykiss, Environmental Biology of Fishes, vol. 66 (1), pg.9-14. doi:10.1023/A:1023269221678

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