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Ura, Kiyoe; Mizuno, Shinya; Okubo, Tadashi; Chida, Yuka; Misaka, Naoyuki; Adachi, Souichi; Yamauchi, Kazuyo

doi:10.1023/a:1007755008204

Cited by 26 publications

(2 citation statements)

References 34 publications

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“…+ ,K + -ATPase activity Gill Na + ,K + -ATPase activity was analyzed according to Ura et al (1997). The release of inorganic phosphate was measured according to the method of Goldenberg and Fermandoz (1966).…”

Section: Measurement Of Gill Namentioning

confidence: 99%

Changes in Transcript Levels of Gill Cortisol Receptor during Smoltification in Wild Masu Salmon, Oncorhynchus masou

Mizuno

Ura²,

Onodera³

et al. 2001

Zoological Science

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Section: Measurement Of Gill Namentioning

confidence: 99%

Changes in Transcript Levels of Gill Cortisol Receptor during Smoltification in Wild Masu Salmon, Oncorhynchus masou

Mizuno

Ura²,

Onodera³

et al. 2001

Zoological Science

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“…In full strength seawater, the osmolarity of the fish internal fluids is around one-third of the surrounding water (Evans et al, 2005), hence they become hypoosmotic relative to the external seawater (McCormick et al, 2013). To cope with this, hypo-osmoregulatory ability is developed during smoltification through changes in kidney function (master thesis), enhanced water permeability in the intestine (Boeuf, 1993; Ura et al, 1997; Duarte et al, 2023), and remodelling of gill cell populations (McCormick et al, 2013), resulting in more efficient salt excretion capacity.…”

Section: Introductionmentioning

confidence: 99%

Impact of three light smoltification regimes on performance and genetic parameters of traits in Atlantic salmon

Gjerde,

Boison,

Hazlerigg

et al. 2024

Preprint

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2800 Atlantic salmon pre-smolts (50 g on average, the offspring of 53 sires and 100 dams) were individually tagged with PIT-tags and distributed among six circular 1200L tanks with approximately 450 fish per tank. Fish in duplicated tanks were put on three different light regimes, i.e. six weeks on either 8L:16D, 12L:12D or 24L:0D followed by six weeks on 24L:0D. One week prior to their transfer as 1+ smolt to a net cage in the sea in June 2021 their body weight, length, subjectively scored smolt status and fin damage were recorded. Recording of animal traits (body weight, wounds, fin damage, snout damage) were also performed in November 2021 and in April 2022. During the light regimes, fish on the two short day regimes had slower growth compared to fish on continuous light. However, after four (November 2021) and ten (April 2022) months in the sea the effect of light regime on fish size was not significantly different from zero (P>0.05). The fish on the 24L:0D regime showed increased mortality from day two after sea transfer with an accumulated recorded mortality of 8.9% during the two first months while it was only 1.0% and 0.7% for the 12L:12D and the 8L:16D fish, respectively. However, from the third until ten months in the sea recorded mortality was very similar for fish on the three light regimes. The effect of light regime on the recorded welfare traits (fin and snout damage and runts) was not significantly different from zero. For traits measured prior to seawater transfer the difference between fish that survived and those that died during the first two months in the sea were largest in the 24L:0D group indicating a positive effect of the short-day regimes also on the general smolt synchronization (i.e., group level uniformity). Moderate heritability estimates were found for the external smolt indicator traits condition factor, smolt status score and skin silveriness, as well as for snout damage, wounds, runts and body weight, but low estimates fin damage. For survival in the sea heritability on the liability scale was 0.09 after four months in the sea and 0.22 from five to ten months in the sea. The estimated genetic correlations between the same trait of the three different light regimes were moderate to high and thus unimportant genotype by light regime interaction. The genetic correlation of body in June 2021 with survival after two months in the sea was high (0.96), but not significantly different from zero with survival after four months in the sea and survival from five to ten months in the sea. Genetic correlations of survival with the other traits recorded in June 2021, November 2021 and April 2022 were low to medium in magnitude and not significantly different from zero. Therefore, for genetic improvement of survival in the seawater period direct selection for increased survival and growth during the first months is probably a better strategy than to perform indirect selection for smolt indicator traits.

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Branchial chloride cells in sea bass (Dicentrarchus labrax) adapted to fresh water, seawater, and doubly concentrated seawater

et al. 2002

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Branchial chloride cells (CC) were studied in sea bass (Dicentrarchus labrax) maintained in seawater (SW: 35 per thousand) or gradually adapted to and subsequently maintained in fresh water (0.2 per thousand) or doubly concentrated seawater (DSW: 70 per thousand). Changes were observed in the location, number, and structure of CCs, that were discriminated by light, scanning, and transmission electron microscopy, as well as by immunofluorescence on the basis of their high Na(+)/K(+)-ATPase antigen content. The number of CCs increased in both fresh water and doubly concentrated seawater compared to control fish maintained in SW. In both experimental conditions, these cells were found on the gill filament (as in control fish) and even on the lamellae, especially in hypersaline conditions. Structural changes concerned the shapes and sizes of CCs and their apical outcrops and particularly the structures of their functional complexes (mitochondria, tubular system, and endoplasmic reticulum), which developed significantly in DSW adapted fish. The changes in the expression of the Na(+)/K(+)-ATPase were evaluated by assessing the enzyme's density at the ultrastructural level following immunogold labeling. This parameter was significantly higher in doubly concentrated seawater. The adaptative significance of the quantitative and morphofunctional changes in branchial chloride cells is discussed in relation to the original osmoregulatory strategy of this marine euryhaline teleost.

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Cited by 26 publications

References 34 publications

Changes in Transcript Levels of Gill Cortisol Receptor during Smoltification in Wild Masu Salmon, Oncorhynchus masou

Changes in Transcript Levels of Gill Cortisol Receptor during Smoltification in Wild Masu Salmon, Oncorhynchus masou

Impact of three light smoltification regimes on performance and genetic parameters of traits in Atlantic salmon

Branchial chloride cells in sea bass (Dicentrarchus labrax) adapted to fresh water, seawater, and doubly concentrated seawater

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