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Influence of light on development of digestive tract process and some indices of growth in Persian sturgeon (Acipenser persicus) larvae
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Rezvanollah Kazemi *   , Farid Firoozbakhsh , Ali Hallajian , Sara Gholami |
| International Sturgeon Research Institute, Agricultural Research Education and Extension Organization (AREEO), Rasht, Iran |
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Abstract: (1656 Views) |
The aim of this study was to access the basic information of digestive tract and growth indices of Persian sturgeon (Acipenser persicus) larvae at endo feeding stage (8 days) under optical interaction between photoperiod and light intensity. This research was carried out with 7 treatments including 4 light intensities (0, 50, 150 and 300 lux) and three photoperiods of 24 hours lighting and without darkness (24L:00D), 12 hours lighting and 12 hours darkness (12L:12D), 24 hours Dark and non-lighting (00L:24D) and control group which each treatment having three replications. The larval digestive tract was sampled on a daily basis. Histological specimens of the larval digestive tract were prepared with 7μm slides after fixed in Buen's solution and tissue processing based on standard histological methods. The slides were stained with Hematoxylin and Eosin (H & E), and they were studied with a light microscope. Also, growth indices including final weight, specific growth factor and larvae weight gain were calculated at the end of the experiment. The results of this study showed that the process of development the digestive tract of larvae, which were affected the higher light intensity (150-300 lux) and longer photoperiod (12-24 hours), were faster and more balanced than other treatments. Growth indices were also significantly better in the same treatments. So, Persian sturgeon larvae require proper and simultaneous management of photoperiod and light intensity for optimal growth in the endo nutrition stage.
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| Keywords: Persian sturgeon, early stages of life, photoperiod and light intensity, digestive system, growth |
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Full-Text [PDF 738 kb]
(423 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2019/04/15 | Accepted: 2019/09/13 | Published: 2019/12/22
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