Use of Exercise and Structure during Rainbow Trout Rearing - Open Journal of Applied Sciences

OJAppS > Vol.10 No.5, May 2020

Open Journal of Applied Sciences

Volume 10, Issue 5 (May 2020)

ISSN Print: 2165-3917 ISSN Online: 2165-3925

Google-based Impact Factor: 0.92 Citations h5-index & Ranking

Use of Exercise and Structure during Rainbow Trout Rearing ()

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Download as PDF (Size: 462KB) PP. 258-269

DOI: 10.4236/ojapps.2020.105020 471 Downloads 1,579 Views Citations

Author(s)

Jill M. Voorhees, Nathan Huysman, Eric Krebs, Michael E. Barnes

Affiliation(s)

Department of Game, Fish and Parks, McNenny State Fish Hatchery, Spearfish, USA.

ABSTRACT

A combination of two forms of environmental enrichment (in-tank structure and exercise) was evaluated during the hatchery rearing of juvenile rainbow trout Oncorhynchus mykiss. The study used four treatments: 1) neither exercise nor structure, 2) exercise without structure, 3) structure without exercise, and 4) both exercise and structure. Velocities in the unexercised tanks were a constant 12.2 cm-s^-1. Velocities in the exercised tanks alternated weekly with one week at 12.2 cm-s^-1 followed by a week at 30.5 cm-s^-1. Structural enrichment consisted of an array of vertically-suspended aluminum angles. The use of either environmental enrichment technique significantly improved final tank weight, gain, percent gain, and specific growth rate. Feed conversion ratio was significantly and positively influenced only by structure, but fish on the exercise routine were overfed. There were no significant interactions between exercise and structure, indicating that each form of environmental enrichment operates independently. The results of this study indicate fish rearing performance can be improved with the addition of either vertically-suspended aluminum angles or an exercise routine, but the combination of the two techniques may not be needed to improve rainbow trout growth.

KEYWORDS

Routine, Velocity, Oncorhynchus mykiss, Salmonids, Environmental Enrichment

Share and Cite:

Voorhees, J. , Huysman, N. , Krebs, E. and Barnes, M. (2020) Use of Exercise and Structure during Rainbow Trout Rearing. Open Journal of Applied Sciences, 10, 258-269. doi: 10.4236/ojapps.2020.105020.

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