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Photoperiod can be used to enhance growth and improve feeding efficiency in farmed rainbow trout, Oncorhynchus mykiss

journal contribution
posted on 2023-05-16, 18:31 authored by Taylor, JF, North, BP, Porter, MJR, Bromage, NR, Migaud, H
The current studies examined whether photoperiod techniques could be successfully transferred to commercial freshwater rainbow trout farming practices, with the key aim being to enhance winter grow-out and production in "open/uncovered systems". Four experiments were undertaken to assess the effects of photoperiod in relation to: growth and feeding regime in tank reared fry; light intensity and growth in tank reared fry; growth and feeding efficiency in cages; and the use of different lighting technologies (bulb colour temperature) in cages. Commercial field trials conducted over a 3-year period showed that exposure of different developmental stages of rainbow trout to periods of constant light from autumn to spring appeared to enhance growth rates and could improve feed conversion. Furthermore, exposure to higher light intensities appeared to promote greater growth and feeding efficiency in all stages of production. The importance of even light distribution in the culture system rather than a critical light intensity was also evident. The outcome of artificial light regimes has been the ability to increase growth rates by up to 25%, alter stock out times, and reduce production time by as much as 2 months. © 2006 Elsevier B.V. All rights reserved.

History

Publication title

Aquaculture

Volume

256

Issue

1-4

Pagination

216-234

ISSN

0044-8486

Department/School

Institute for Marine and Antarctic Studies

Publisher

Elsevier BV

Place of publication

Netherlands

Repository Status

  • Restricted

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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