NDLI: Effects of constant light on haematological parameters of cultured rainbow trout (Oncorhynchus mykiss) in the Southern Hemisphere

Content Provider	Springer Nature Link
Author	Valenzuela, Ariel E. Silva, Victor M. Klempau, Alfredo E.
Copyright Year	2006
Abstract	The effects of artificial photoperiod regimes on reproductive patterns have been studied in several species, as have haematological parameters. However, information on how artificial photoperiods may affect blood components is scarce, especially under field conditions. We have assessed the effects of constant light [long day (LD) photoperiod: 24 h (light):0 h (dark)] on haematological parameters of cultured rainbow trout in Chile (Southern Hemisphere). In the initial stage (March up to June), two groups of fish were maintained under similar conditions and under the ambient (natural) photoperiod (NP). One group was then placed under the LD photoperiod regime for 2 months (June/July), following which it was returned to␣the NP (August–January); the control group remained under the NP throughout the experiment (March–January). All fish were assessed for haematological parameters and growth performance at various times during the experiment. During the initial stage, no differences were found between groups. However, at the end of the LD 24:0 period, the LD fish had increased haematocrit values and erythrocyte numbers and diminished mean corpuscular haemoglobin. After the LD fish had been returned to the NP, they developed secondary sexual characteristics and had a 40–44% decrease in the number of leukocytes.
Starting Page	113
Ending Page	120
Page Count	8
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	32
Issue Number	2
e-ISSN	15735168
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-08-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Artificial photoperiod Erythrocytes Haematology Leukocytes Oncorhynchus mykiss Peripheral blood Animal Physiology Animal Anatomy / Morphology / Histology Zoology Hydrobiology Animal Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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