Abstract
This study investigated the effects of coloured structures on the growth of juvenile landlocked fall Chinook salmon (Oncorhynchus tshawytscha, Walbaum) during hatchery rearing. Structures consisted of an array of four aluminum angles painted one of four colours: Silver, red, black and green, which were vertically suspended in circular tanks. After 25 days, mean total lengths and weights of individual salmon reared in tanks with the green arrays were significantly (P 0.05) among the colour treatments. Final total tank biomass and gain were also not significantly different (P > 0.05) among the colour treatments. The results of this study indicate that structural colours could be considered to maximize juvenile Chinook salmon growth during hatchery rearing. Key words: Chinook salmon, colour, Oncorhynchus tshawytscha, hatchery rearing.
Highlights
Little is known about the impacts of colour on cultured fish
The colours used during hatchery rearing may affect feed intake, growth, aggression, stress response and body colouration (Volpato and Bareto, 2001; Strand et al, 2007; Qin et al, 2012; Eslamloo et al, 2015; Gaffney et al, 2016; Ghavidel et al, 2019)
Individual salmon reared with the green angles were significantly heavier and longer than those reared in any of the other colour treatments
Summary
Little is known about the impacts of colour on cultured fish. The colours used during hatchery rearing may affect feed intake, growth, aggression, stress response and body colouration (Volpato and Bareto, 2001; Strand et al, 2007; Qin et al, 2012; Eslamloo et al, 2015; Gaffney et al, 2016; Ghavidel et al, 2019). The effects of specific colours are not universal among species. Blue light was found to reduce stress in Nile tilapia (Oreochromis niloticus) (Volpato and Bareto, 2001) but increase stress in rainbow trout (Oncorhynchus mykiss) (Karakatsouli et al, 2007). Color preferences in fish may change over time (Ullmann et al, 2011)
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