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Some changes in the haematological parameters of rainbow trout (Oncorhynchus mykiss) exposed to three artificial photoperiod regimes

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Abstract

Haematological parameters are often used as health status and stress indicators in fish. However, information on the effects of artificial photoperiods on these parameters is scarce and ambiguous. The consequences of three different artificial photoperiod regimes [light/day 12 h:12 h (LD 12:12) for 150 days as controls; LD 14:10 and LD 24:0, both for an initial 60 days, and then LD 12:12 for the remaining 90 days] were evaluated in trout. In all fish the haemogram and the erythrocyte production index (EPI) were assessed at days 7, 14, 30 and 60 (phase 1) and at days 90, 120 and 150 (phase 2). At the end of phase 1, photoperiods LD 14:10 and 24:0 induced higher production of immature (late basophilic) erythrocytes (0.06–0.08 × 1012 cells/l, P < 0.05) and elevated EPI (young erythrocytes = 1.6 in LD 14:10, 2.25 in LD 24:0; late basophilic erythrocytes = 4.1–4.9 in LD 14:10, 3.3 in LD 24:0) than in controls (late basophilic erythrocytes = 0.02–0.04 × 1012 cells/l; EPI young erythrocytes = 0.2–1.0; EPI late basophilic erythrocytes = 1.4–2.7). During phase 2, only reduced numbers of lymphocytes and thrombocytes were observed at day 150 in the LD 14:00 group. An increase in the EPI (1.9) of control young erythrocytes was found at day 150.

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Valenzuela, A.E., Silva, V.M. & Klempau, A.E. Some changes in the haematological parameters of rainbow trout (Oncorhynchus mykiss) exposed to three artificial photoperiod regimes. Fish Physiol Biochem 33, 35–48 (2007). https://doi.org/10.1007/s10695-006-9115-4

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