Effect of Photoperiod on Growth and Efficiency of Yolk-Sac Utilization in Alevins of Brook Trout

Photoperiod is known as a key factor influencing the growth, feed conversion efficiency and other physiological functions of a fish. In this study, the effects of photoperiod on growth and yolk conversion efficiency in brook trout (Salvelinus fontinalis) alevins were demonstrated under three differe...

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Bibliographic Details
Published in:Pakistan journal of zoology 2016-04, Vol.48 (2), p.533
Main Authors: Sonay, Fatma Delihasan, Onder, Mustafa Yusuf, Bascinar, Nadir, Khan, Umar
Format: Article
Language:English
Subjects:
Animal development
Aquaculture
Bass
Brook trout
Conversion
Darkness
Efficiency
Feed conversion
Fish hatcheries
Fishing
Growth
Growth rate
Light
Photoperiods
Physiological aspects
Physiological effects
Salvelinus fontinalis
Trout
Water temperature
Yolk
Zoological research
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Summary:Photoperiod is known as a key factor influencing the growth, feed conversion efficiency and other physiological functions of a fish. In this study, the effects of photoperiod on growth and yolk conversion efficiency in brook trout (Salvelinus fontinalis) alevins were demonstrated under three different photoperiod regimes. The newly hatched brook trout alevins (491.4 degree-days) were reared under a natural photoperiod regime (control group) and two fixed photoperiod regimes: 24h L (continuous light) and 24h D (continuous darkness). Brook trout alevins held under 24h L photoperiod regime had greater weight gain and yolk conversion efficiency (YCE) with lower development index (KD) value while alevins held under 24h D photoperiod regime had the lowest growth rate and YCE with greater KD value. In all groups, a strong linear correlation (above r2=0.9) was found between alevin weight and degree-days, and yolk-sac weight and degree-days.
ISSN:0030-9923