Endogenous circadian rhythm in the river puffer fish Takifugu obscurus

Ws, Kim; Jm, Kim; Sk, Yi; Ht, Huh

doi:10.3354/meps153293

Cited by 26 publications

(26 citation statements)

References 14 publications

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“…The total daytime oxygen demand was approximately 20% higher than at nighttime in surface morphs, which concurs with the magnitude reported for other fish species [21], [26]. In contrast, Pachón fish had a steady metabolic rate when held under the constant dark conditions that simulate a cave.…”

Section: Discussionsupporting

confidence: 87%

Eyeless Mexican Cavefish Save Energy by Eliminating the Circadian Rhythm in Metabolism

2014

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The eyed surface form and eyeless cave form of the Mexican tetra Astyanax mexicanus experience stark differences in the daily periodicities of light, food and predation, factors which are likely to have a profound influence on metabolism. We measured the metabolic rate of Pachón cave and surface fish at a fixed swimming speed under light/dark and constant dark photoperiods. In constant darkness surface forms exhibited a circadian rhythm in metabolism with an increase in oxygen demand during the subjective daytime, whereas cave forms did not. The lack of circadian rhythm in metabolism leads to a 27% energy savings for Pachón cave fish compared to surface fish when comparing both forms in their natural photoperiods. When surface forms were tested under constant dark conditions they expended 38% more energy than cave forms under equivalent conditions. Elimination of the circadian rhythm in metabolism may be a general feature of animals that live in perpetually dark food-limited environments such as caves or the deep sea.

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Section: Discussionsupporting

confidence: 87%

Eyeless Mexican Cavefish Save Energy by Eliminating the Circadian Rhythm in Metabolism

2014

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“…Circadian rhythms were also exhibited by mullet (Marais 1978;Shekk 1986), juvenile flounder (Liu et al 1997), and unfed juvenile Mediterranean yellowtail Seriola dumerili (De la Gándara et al 2002). In the river puffer fish Takifugu obscures a circadian rhythm in oxygen consumption was attributed to endogenous origin (Kim et al 1997). Activity patterns of fish may be related to feeding times or nutritional status (Boulos and Terman 1980;Mistlberger 1994;Sánchez-Vázquez et al 1995;Via et al 1999;Boujard et al 2000), as increased activity prior to the critical time limit of food absence raises the chance of finding a new food patch (Méndez and Wieser 1993).…”

Section: Diurnal Rhythm Of Metabolic Activitymentioning

confidence: 95%

Diurnal and water salinity-dependent metabolic activity of juvenile white steenbrasLithognathus lithognathus

Kandjou

Kaiser

2014

African Journal of Aquatic Science

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The euryhaline white steenbras Lithognathus lithognathus is an important estuarine-dependent fish species in the South African marine and estuarine environment. Its tolerance to water quality fluctuations, in particular its metabolic rate responses to salinity changes, has not been studied. In order to contribute to ecophysiogical data on this species, oxygen consumption by white steenbras was determined to quantify metabolic activity. White steenbras were most active during daylight hours when oxygen consumption was 28% higher than during the scotophase. Standard, routine and active metabolic rate estimates were 0.04, 0.09 and 0.12 mg O 2 g −1 h −1 , respectively. In juveniles (body mass [W] = 19.8-85 g fish −1 ), the metabolic rate (MR; mg O 2 g −1 h −1 ) was estimated as MR = 0.62W −0.526 . The MR was reduced in fish exposed to a fast drop in salinity within 10 min from 35 to 5, but not in fish exposed to a fast drop to 25 or a slow drop within 3 or 9 h to 25 or 5, respectively. At a salinity of 5, oxygen consumption rate was 51% lower than at salinities of 25 and 35.

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“…지금까지 황복에 대한 연구는 생식생물학 (Jang 환경생리 et al, 1999a;Jang et al, 1999b), (Kim et 발생 al., 1996;Kim et al, 1997), (Jang et al, 초 1996;Yang & Chen, 2005;Byeon et al, 2011), 기 사육 세포유전학 (Kang et al, 2004), (Park et …”

Section: 양식방법이 개발되어 생산량 증가로 양식산 황복unclassified

Effect of Feeding Frequency on Growth and Body Composition of Juvenile River Puffer, Takifugu obscurus in Winter season

Kang¹,

Cho²,

Son³

et al. 2015

Journal of Fisheries and Marine Sciences Education

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To survey the most feeding frequence of formulated diet as food for cultured puffer in winter season, we performed a rearing test using juveniles of river puffer, Takifugu obscurus (body weight 15.0 g) for 120 days. The feeding frequencies were set up as 2times/1day, 2times/2days, 2times/3days and 2times/4days. We tested triplicately the experiment and investigated survival rate, daily food intake (DFI), feed efficiency (FE), condition factor (CF), daily growth rate (DGR). Consequently, growth was increased following to an increasing of feeding frequency, was the fast in 2times/1day of feeding frequency, and was the slowest in 2times/4days (p<0.05). DFI and CF were increased following to an decreasing of feeding frequency and was the highest in 2times/4days of feeding frequency. FE was decreased following to an decreasing of feeding frequency, and was the highest in 2times/1day of feeding frequency. In a proximate carcass composition at the final day, moisture and crude lipid contents were the lowest in 2times/4days, and in survival, there was not any significant difference among experimental groups. Therefore, we concluded that the 2times/2days are the best of feeding frequency for economical benefit of river puffer culture in winter season.

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Endogenous circadian rhythm in the river puffer fish Takifugu obscurus

Cited by 26 publications

References 14 publications

Eyeless Mexican Cavefish Save Energy by Eliminating the Circadian Rhythm in Metabolism

Eyeless Mexican Cavefish Save Energy by Eliminating the Circadian Rhythm in Metabolism

Diurnal and water salinity-dependent metabolic activity of juvenile white steenbrasLithognathus lithognathus

Effect of Feeding Frequency on Growth and Body Composition of Juvenile River Puffer, Takifugu obscurus in Winter season

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