Influence of increased photoperiods on growth, feed consumption and survival of juvenile mirror carp (Cyprinus carpio, Linnaeus, 1758), Journal of FisheriesSciences.com, 3(2): 146-152.


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Danışman D., YİĞİT M.

Journal of FisheriesSciences.com, vol.3, no.2, pp.146-152, 2009 (Peer-Reviewed Journal)

  • Publication Type: Article / Article
  • Volume: 3 Issue: 2
  • Publication Date: 2009
  • Journal Name: Journal of FisheriesSciences.com
  • Journal Indexes: TR DİZİN (ULAKBİM)
  • Page Numbers: pp.146-152

Abstract

A growth trial was conducted in order to determine the effects of increased photoperiod regimes

on growth performance, feed intake and survival of mirror carp (Cyprinus carpio Linnaeus,

1758) in laboratory conditions for 90 days. Triplicate groups of fish (6 g mean body

weight) were exposed to photoperiod regimes of 12 hours light:12 hours dark (12L:12D), increased photoperiods of 16 hours light:8 hours dark (16L:8D) and continuous light (24L:0D),

respectively. At the end of the trial, growth was highest in the group subjected to continuous

photoperiod, and appeared significantly different (p<0.05) than the rates recorded in the other

photoperiod regimes. Under the continuous (24L:0D) photoperiod, feed conversion ratio (FCR)

was significantly (p<0.05) better than those in the other photoperiod treatments. No significant

difference (p>0.05) was found in the FCRs between the 12L:12D and 16L:8D groups. Feed

intake was not significantly (p>0.05) affected by photoperiod treatments. No mortality was observed in the continuous (24L:0D) photoperiod group, however, a mortality of about 3 % was

recorded in the other two groups. For a better growth and lower food conversion rate, a continuous (24L:0D) photoperiod exposure is suggested best for rearing of juvenile carp.