Qualitative and quantitative effects of constant light photoperiod on rainbow trout (Oncorhynchus mykiss) peripheral blood erythrocytes

Valenzuela, Ariel; Silva, Victor Menezes; Klempau, Alfredo E.

doi:10.1016/j.aquaculture.2005.06.012

Cited by 23 publications

(16 citation statements)

References 20 publications

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“…Thus, in the present investigation, the changes observed in fish of the LD 24:0 group towards the end of the 2-month illumination period (increased haematocrit values and erythrocyte numbers) can be explained as a consequence of acute stress or, alternatively, as a stimulation of erythropoiesis by increased light exposure. Nevertheless, in another Fish Physiol Biochem (2006) 32:113-120 117 study carried out at the same time, these same fish showed (towards the end of the LD 24:0 protocol) increased numbers of immature erythrocytes at the same maturational stage, suggesting that erythropoiesis was actually depressed and not stimulated (Valenzuela et al 2006). Consequently, the acute stress induced by constant light, as described by Biswas et al (2006), may have stimulated the release of mature and immature erythrocytes from the spleen into circulation by splenic contraction Itazawa 1989, 1990), thereby increasing the haematocrit values and total erythrocyte numbers.…”

Section: Discussionmentioning

confidence: 90%

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

Valenzuela

Silva

Klempau

2006

Fish Physiol Biochem

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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.

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Section: Discussionmentioning

confidence: 90%

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

Valenzuela

Silva

Klempau

2006

Fish Physiol Biochem

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“…Photoperiod was reported to increase the growth and survival of larvae (Boeuf & Baille, 1999) of fish particularly in temperate regions through photo stimulation which induced feed intake and improved the feed conversion efficiency (Woiwode & Adelman, 1991). Effects of different photoperiods on growth of various fishes have been reported by a number of workers, notable among them are Davies et al (1986 a/ b); Imsland et al (1995); Arvedlund et al (2000); Purchase et al (2000); Ergün et al (2003); Rad et al (2006); Taylor et al (2006); Valenzuela et al (2006); Bonnet et al (2007); Askarian and Kousha (2009) and Yager and Yigit (2009). The developmental and maturation process are governed by genetic and environmental factors in fish.…”

Section: Introductionmentioning

confidence: 97%

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Bano¹,

Serajuddin²

2018

Turk. J. Fish. Aquat. Sci.

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The influence of different photoperiods was studied on the growth and behaviour of the giant gourami, Trichogaster fasciata. Fish (weight=1.1g; length=4.36cm) were subjected to photoperiod regimes of 0L:24 D, 8L:16 D, 12L:12 D and 16L:8 D for 90 days in triplicates. The growth rate was highest (weight=4g) and lowest (weight=2.36g) in the groups subjected to 16L: 8D and 0L: 24D photoperiods respectively. The mean body weight and mean total length were significantly higher (P<0.05) while standard length and caudal fin length (P>0.05) were not significant in the 16 hours light. Mean values of food conversion ratio and condition factor were lowest while various growth parameters were found to be maximum in the 16 hours light. 16L:8D photoperiod regime produced pronounced effects on the welfare of giant gourami as shown by the nonintrusive welfare indicators. The photoperiodic signals were found to be capable of modifying the behavioural activities where male aggression related to territory or defence and female selection were reduced in control group. The optimum photoperiod (16 L: 8 D) was an environmental cue for the better growth, welfare and behaviour.

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“…The physical factor such as photoperiod is known to increase the growth and survival rate of juvenile fish [3] particularly in temperate regions through processes such as photo stimulation, feed intake which improves the feed conversion efficiency [4][5][6]. Studies on the use of light intensities in different fish species have been carried out by many workers, notable among them are [7][8][9][10][11][12][13][14][15]. Simensen et al [16] pointed out that photoperiod act as a zeitgeber that controls growth.…”

Section: Introductionmentioning

confidence: 99%

Effects of Photoperiods on the Growth Performance of Juvenile<i> Trichogaster lalius</i> (Hamilton, 1822)

Awasthi

Gupta

Bano

et al. 2017

ILNS

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Abstract. Juvenile of Trichogaster lalius was reared under three photoperiod conditions (0L:24D, 12L:12D, 16L:08D) for 60 days to examine the growth performance under laboratory conditions. The maximum growth was observed in the juvenile of T. lalius exposed to 16:00 hrs. light. The mean body weight of different groups of juvenile fish exposed to different light conditions were significantly different (p<0.05) from each other which was observed from 20 th day of the experiment. The absolute, specific, and relative growth rates were found to be maximum in the group exposed to 16:00 hrs. light duration. The present study indicated that 16:00 hrs. light duration was considered to be better for the growth of juvenile of T. lalius under controlled condition.

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Qualitative and quantitative effects of constant light photoperiod on rainbow trout (Oncorhynchus mykiss) peripheral blood erythrocytes

Cited by 23 publications

References 20 publications

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

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

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Effects of Photoperiods on the Growth Performance of Juvenile<i> Trichogaster lalius</i> (Hamilton, 1822)

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