A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon (Salmo salar)

Citation

Berrill I, Smart A, Bromage NR & Porter MJR (2006) A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon (Salmo salar). Aquaculture, 254, pp. 625-636. http://www.sciencedirect.com/science/journal/00448486; https://doi.org/10.1016/j.aquaculture.2005.10.036

Abstract
Four groups of Atlantic salmon fry (n=2000) were exposed to continuous light (LD24:0) from first feeding on 18th April 2001, after which they were exposed to either an 8 or 12 week period of short days (LD10:14) starting on either the 21st May or the 18th June. Each group was then returned to LD24:0 until the conclusion of the experiment the following March. In August 200 fish per treatment were individually PIT tagged. All groups were maintained under an ambient temperature regime. The highest levels of sexual maturation in 0+ male parr were recorded in the 12 week/May group (>11% of the entire male and female population), with the lowest levels (6%) in the 8 week/May and 8 week/June groups (P

Keywords
Atlantic salmon; parr; growth; maturation; smoltification; photoperiod; Atlantic salmon; Photoperiodism

Journal
Aquaculture: Volume 254

• Winter photoperiod timing and duration paper - copy after second comments.doc
• Winter photoperiod timing and duration paper - copy after second comments.pdf