Abrupt changes in photoperiod affect age at maturity, timing of ovulation and plasma testosterone and oestradiol-17β profiles in Atlantic salmon, Salmo salar

Taranger, Geir Lasse; Haux, Carl; Stefansson, Sigurd O.; Björnsson, Björn Thrándur; Walther, Bernt T.; Hansen, Tom

doi:10.1016/s0044-8486(98)00168-9

Cited by 131 publications

(86 citation statements)

References 19 publications

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“…The reduced incidence of sexual maturation in the LL groups in the present study concur with an earlier study on 2SW salmon (Taranger et al 1998), and studies on grilse maturation (1SW) in springtransferred (Taranger et al 1995, Oppedal et al 1997, Leclercq et al 2011, and autumntransferred (Oppedal et al 2006) salmon. The reduction in the incidence of sexual maturation was also independent of lighting technology, in line with Leclercq et al (2011), who suggested that light irradiance rather than light technology or light spectral composition was the prime parameter reducing the incidence of sexual maturation.…”

Section: Sexual Maturationsupporting

confidence: 93%

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Hansen¹,

Fjelldal²,

Folkedal³

et al. 2017

Aquacult. Environ. Interact.

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We investigated how highly efficient LED light sources may be used in Atlantic salmon cage farming. Specifically, we tested the incidence of sexual maturation and growth patterns in autumn sea-transferred Atlantic salmon Salmo salar L. during their second sea winter given continuous artificial light (LL) (between 13 January and 18 June) of 5 different intensities using LED sources, compared to a single intensity provided by a metal halide (MH) source or a control treatment of natural light (NL). Growth effects were independent of light source, but increased with irradiance. We propose a model wherein sufficiently high irradiance from the artificial light source will give a long day signal throughout late winter and spring, an intermediate irradiation will give a long day signal until it is outcompeted by the seasonal increase in natural light, and an irradiance that is always below the threshold will not be perceived as different from natural light. Sexual maturation in males (6.1% under NL) was evenly arrested at all intensities, and swimming activity at night increased during winter in lit groups. We conclude that LED lamps may replace MH sources at similar intensity. Reducing the light irradiance of the superimposed light reduced the growth-stimulating effect, but all irradiances reduced the incidence of sexual maturation.

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Section: Sexual Maturationsupporting

confidence: 93%

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Hansen¹,

Fjelldal²,

Folkedal³

et al. 2017

Aquacult. Environ. Interact.

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“…Photoperiod manipulation has been successfully used to modulate sexual maturation cycles in several finfish species from northern latitudes including Atlantic salmon, Salmo salar (Taranger et al, 1998); rainbow trout, Oncorhynchus mykiss (Bromage et al, 1984); Atlantic halibut, Hippoglossus hippoglossus ; turbot, Scophthalmus maximus (Devauchelle et al, 1988); sole, Solea solea (Devauchelle et al, 1988) and sea bass, Dicentrarchus labrax (Carrillo et al, 1989). In commercial hatcheries, photoperiod manipulation has been employed to both compress and delay normal seasonal maturational cycles in broodfish Hansen et al, 2001) and thus provide year-round availability of eggs for incubation.…”

Section: Discussionmentioning

confidence: 99%

Untitled

Çoban¹,

Kamacı²,

Suzer³

et al. 2011

Turk. J. Fish. Aquat. Sci.

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In this study, egg quality determination of common dentex (Dentex dentex) was investigated by using egg, yolk and oil globule diameter from the first division to the hatching, during natural and photoperiodic manipulation of spawning time. In the viable, floating eggs, the minimal and maximal diameter of the egg, yolk and oil globule were measured. Based on these measurements several parameters were calculated describing the shape of the egg, yolk and oil globule and the size relationship between these compartments. Hatching rate was calculated as 92% in natural spawning time (NST) and 61% photoperiodic manipulation of spawning time (PMST). Also, average egg diameter was measured as 0.949±0.038 mm in NST and 0.911±0.014 mm in PMST. In NST, egg diameter and yolk diameter of the eggs were significantly bigger than eggs in PMST (P<0.05). The morphometric parameters of oil globule could be accepted as an indicator for description of quality criteria of eggs.Keywords: Dentex dentex, egg quality, morphometry, embryological development. Sinarit'lerde, Dentex dentex, Yumurta Kalitesi Üzerine Bazı Morfometrik Karakterlerin Etkisi ÖzetBu çalışmada, sinaritlerde (Dentex dentex), ilk bölünmeden yumurtadan çıkışa kadar olan süre zarfında, yumurta, vitellüs ve yağ damlasının çapları, doğal ve fotoperiyot uygulamasının yapıldığı dönemler boyunca yumurta kalitesini tanımlamak için incelendi. Canlı ve yüzen yumurtalarda yumurta, vitellüs ve yağ damlasının minimum ve maksimum çapı ölçüldü. Ölçülen bu parametreler temelinde yumurta, vitellüs ve yağ damlasının şekli ve bu bölümler arasındaki boyut ilişkisi tanımlanarak hesaplandı. Yumurtadan çıkış oranı doğal yumurtlama sezonunda (NST) %92 ve yumurtalama zamanının fotoperiyodik olarak değiştirildiği dönemde (PMST) %61 olarak hesaplandı. Ayrıca, ortalama yumurta çapı NST döneminde 0,949±0,038 mm ve PMST döneminde 0,911±0,014 mm olarak ölçüldü. NST döneminde yumurtanın, yumurta çapı ve vitellüsün çapı PMST dönemindeki yumurtalardan önemli ölçüde daha büyüktür (P<0,05). Bununla birlikte yağ damlasının morfometrik parametreleri, yumurtaların kalite kriterlerinin tanımlanması için bir belirleyici olarak kabul edilebilir.Anahtar Kelimeler: Dentex dentex, yumurta kalitesi, morfometri, embriyolojik gelişim.

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“…Many studies have shown the effect of exposure to artificial light/dark cycles on the onset of maturation; hereby opening an opportunity to postpone maturation by keeping the fish under a light regime not providing photoperiodic cues that could induce maturation (Adams and Thorpe, 1989, Taranger et al, 1998, Porter et al, 1999, Melo et al, 2014. In a study by Porter et al (1999) only 6.1% matured under an artificial light regime (exposed to additional light during night) compared to 61.5% maturing in the control group exposed to the natural light regime.…”

Section: Effect Of Photoperiod Manipulation On Maturationmentioning

confidence: 99%

Approaches for delaying sexual maturation in salmon and their possible ecological and ethical implications

Iversen

Myhr

Wargelius

2016

Journal of Applied Aquaculture

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Abrupt changes in photoperiod affect age at maturity, timing of ovulation and plasma testosterone and oestradiol-17β profiles in Atlantic salmon, Salmo salar

Cited by 131 publications

References 19 publications

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Untitled

Approaches for delaying sexual maturation in salmon and their possible ecological and ethical implications

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