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ผู้เขียน หัวข้อ: Effects of light spectrum, rearing density and light intensity on growth perform  (อ่าน 2841 ครั้ง)
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« เมื่อ: พฤษภาคม 05, 2010, 02:02:19 PM »

Effects of light spectrum, rearing density and light intensity on growth performance of scaled and mirror common carp Cyprinus carpio reared under recirculating system conditions

Nafsika Karakatsoulia, Eustratios S. Papoutsogloua, Nikolaos Sotiropoulosa, Dimitrios Mourtikasa, Tone Stigen-Martinsena and Sofronios E. Papoutsogloua


a Department of Applied Hydrobiology, Faculty of Animal Science and Aquaculture, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece

Received 21 July 2009;  accepted 15 January 2010.  Available online 25 January 2010.

Abstract
It is well known that fish vision and spectrum perception are strongly related to each species natural habitat and living ethology. Recent research data clearly indicate that light spectrum affects farmed fish stress response, physiological status, behaviour, and consequently growth performance. This study aimed to investigate the effects of white (full-spectrum), red (605 nm) and blue (480 nm) light on common carp reared in a recirculating water system. Two experiments were conducted. The first (Experiment 1) was performed on scaled carp (14.68 ± 0.14 g, duration 158 days) combining light treatment with two stocking densities (low: 10 specimens tank−1 or 1.22 kg m−3 and high: 40 specimens tank−1 or 4.89 kg m−3). The second (Experiment 2) investigated the effects of light spectrum in mirror carp (51.88 ± 0.46 g, duration 143 days) combined with two light intensities (150 and 300 lx). Within the fish life stage examined and duration of present experiments, it is indicated that scaled common carp should be reared under red illumination when at low stocking density and blue illumination when at high stocking density. For the rearing of mirror carp, blue or red light should be avoided since they induced an increase in size heterogeneity. Present results also underline the importance of lighting conditions on reared common carp physiological status. Changing light spectrum in indoor recirculating water systems is easy, cost efficient and appropriate manipulation could befit reared fish welfare.

Keywords: Light spectrum; Common carp; Rearing density; Light intensity; Growth; Stress

Aquacultural Engineering
Volume 42, Issue 3, May 2010, Pages 121-127
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