Effects of different photoperiods on growth, stress and haematological parameters in juvenile great sturgeon Huso huso
Identifieur interne : 000E07 ( Istex/Corpus ); précédent : 000E06; suivant : 000E08Effects of different photoperiods on growth, stress and haematological parameters in juvenile great sturgeon Huso huso
Auteurs : Ali Bani ; Mehdi Tabarsa ; Bahram Falahatkar ; Ashkan BananSource :
- Aquaculture Research [ 1355-557X ] ; 2009-11.
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Abstract
The effects of constant light (24L:00D), no light (00L:24D) and two light–dark periods (18L:06D;12L:12D) on the growth, stress and haematological variables were assessed in juvenile great sturgeon, Huso huso. During the 8‐week experimental period, juveniles (22.5 ± 0.6 g) were kept under a 150 lx light intensity in fibreglass tanks (0.8 m2, 500 L). Differences in growth were insignificant during the experiment, but lactate levels were higher in the 00L:24D and 24L:00D photoperiods compared with 12L:12D and 18L:06D photoperiods. Cortisol levels did not show differences among the various photoperiods. At the end of the experimental period, fish reared under a 12L:12D photoperiod had higher haemoglobin values and erythrocyte numbers than in the other photoperiods, while no differences were found between groups with regard to haematocrit values or leucocyte numbers. The highest survival rate (89%) was observed in the 12L:12D period in which the levels of lactate and cortisol as stress indicators were minimal. The results indicate that various photoperiods cause different stress levels in juvenile great sturgeon and have no significant effects on growth, at least in short time periods.
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DOI: 10.1111/j.1365-2109.2009.02321.x
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<front><div type="abstract" xml:lang="en">The effects of constant light (24L:00D), no light (00L:24D) and two light–dark periods (18L:06D;12L:12D) on the growth, stress and haematological variables were assessed in juvenile great sturgeon, Huso huso. During the 8‐week experimental period, juveniles (22.5 ± 0.6 g) were kept under a 150 lx light intensity in fibreglass tanks (0.8 m2, 500 L). Differences in growth were insignificant during the experiment, but lactate levels were higher in the 00L:24D and 24L:00D photoperiods compared with 12L:12D and 18L:06D photoperiods. Cortisol levels did not show differences among the various photoperiods. At the end of the experimental period, fish reared under a 12L:12D photoperiod had higher haemoglobin values and erythrocyte numbers than in the other photoperiods, while no differences were found between groups with regard to haematocrit values or leucocyte numbers. The highest survival rate (89%) was observed in the 12L:12D period in which the levels of lactate and cortisol as stress indicators were minimal. The results indicate that various photoperiods cause different stress levels in juvenile great sturgeon and have no significant effects on growth, at least in short time periods.</div>
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<p>The effects of constant light (24L:00D), no light (00L:24D) and two light–dark periods (18L:06D;12L:12D) on the growth, stress and haematological variables were assessed in juvenile great sturgeon, <i>Huso huso</i>
. During the 8‐week experimental period, juveniles (22.5 ± 0.6 g) were kept under a 150 lx light intensity in fibreglass tanks (0.8 m<sup>2</sup>
, 500 L). Differences in growth were insignificant during the experiment, but lactate levels were higher in the 00L:24D and 24L:00D photoperiods compared with 12L:12D and 18L:06D photoperiods. Cortisol levels did not show differences among the various photoperiods. At the end of the experimental period, fish reared under a 12L:12D photoperiod had higher haemoglobin values and erythrocyte numbers than in the other photoperiods, while no differences were found between groups with regard to haematocrit values or leucocyte numbers. The highest survival rate (89%) was observed in the 12L:12D period in which the levels of lactate and cortisol as stress indicators were minimal. The results indicate that various photoperiods cause different stress levels in juvenile great sturgeon and have no significant effects on growth, at least in short time periods.</p>
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<namePart type="family">Falahatkar</namePart>
<affiliation>Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">Ashkan</namePart>
<namePart type="family">Banan</namePart>
<affiliation>Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran</affiliation>
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<originInfo><publisher>Blackwell Publishing Ltd</publisher>
<place><placeTerm type="text">Oxford, UK</placeTerm>
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<dateIssued encoding="w3cdtf">2009-11</dateIssued>
<copyrightDate encoding="w3cdtf">2009</copyrightDate>
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<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<extent unit="words">6557</extent>
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<abstract lang="en">The effects of constant light (24L:00D), no light (00L:24D) and two light–dark periods (18L:06D;12L:12D) on the growth, stress and haematological variables were assessed in juvenile great sturgeon, Huso huso. During the 8‐week experimental period, juveniles (22.5 ± 0.6 g) were kept under a 150 lx light intensity in fibreglass tanks (0.8 m2, 500 L). Differences in growth were insignificant during the experiment, but lactate levels were higher in the 00L:24D and 24L:00D photoperiods compared with 12L:12D and 18L:06D photoperiods. Cortisol levels did not show differences among the various photoperiods. At the end of the experimental period, fish reared under a 12L:12D photoperiod had higher haemoglobin values and erythrocyte numbers than in the other photoperiods, while no differences were found between groups with regard to haematocrit values or leucocyte numbers. The highest survival rate (89%) was observed in the 12L:12D period in which the levels of lactate and cortisol as stress indicators were minimal. The results indicate that various photoperiods cause different stress levels in juvenile great sturgeon and have no significant effects on growth, at least in short time periods.</abstract>
<subject lang="en"><genre>keywords</genre>
<topic>light regime</topic>
<topic>great sturgeon</topic>
<topic>cortisol</topic>
<topic>lactate</topic>
<topic>haematology</topic>
<topic>growth</topic>
</subject>
<relatedItem type="host"><titleInfo><title>Aquaculture Research</title>
</titleInfo>
<genre type="journal">journal</genre>
<identifier type="ISSN">1355-557X</identifier>
<identifier type="eISSN">1365-2109</identifier>
<identifier type="DOI">10.1111/(ISSN)1365-2109</identifier>
<identifier type="PublisherID">ARE</identifier>
<part><date>2009</date>
<detail type="volume"><caption>vol.</caption>
<number>40</number>
</detail>
<detail type="issue"><caption>no.</caption>
<number>16</number>
</detail>
<extent unit="pages"><start>1899</start>
<end>1907</end>
<total>9</total>
</extent>
</part>
</relatedItem>
<identifier type="istex">A0A871E5B005228F166878B3EF5CE0DCEBF9435B</identifier>
<identifier type="DOI">10.1111/j.1365-2109.2009.02321.x</identifier>
<identifier type="ArticleID">ARE2321</identifier>
<accessCondition type="use and reproduction" contentType="copyright">© 2009 The Authors. Journal Compilation © 2009 Blackwell Publishing Ltd</accessCondition>
<recordInfo><recordContentSource>WILEY</recordContentSource>
<recordOrigin>Blackwell Publishing Ltd</recordOrigin>
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<serie></serie>
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