A simple method for the measurement of daily feed intake of groups of fish in tanks

Helland, Ståle J.; Grisdale‐Helland, Barbara; Nerland, S.

doi:10.1016/0044-8486(95)01145-5

Cited by 273 publications

(148 citation statements)

References 6 publications

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“…Feed was provided twice daily during the entire experiment (Amber Neptun 100, 5 mm, Skretting, Norway), aiming for > 30% overfeeding. Spill feed was weighed, and feed intake was estimated according to the method of Helland et al (1996). Calculations for estimation of the tank biomass over time are shown in 'Calculations and statistics' below.…”

Section: Fish Materials and Experimental Facilitiesmentioning

confidence: 99%

“…The total feed intake and the tank biomass measured on Days 0, 28 and 45 were used to calculate FCR for Days 0 to 28 and Days 29 to 45. Daily feed intake (DFI, % of BM) was calculated according to the method described by Helland et al (1996). The daily biomass, BM day n (g), was approximated using the FCR and the DFI (g) according to the following formula: BM day n = (BM day n -1 + DFI day n -1 ) / FCR (4) R (2.14.0 The R Foundation for Statistical Computing © 2011) was used to test for a difference in slopes (Davies test), for the 2 lines representing MO 2 at O 2 above and below the LOS (Muggeo 2008).…”

Section: Calculations and Statisticsmentioning

confidence: 99%

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Effect of temperature on the metabolism, behaviour and oxygen requirements of Sparus aurata

Remen¹,

Nederlof²,

Folkedal³

et al. 2015

Aquacult. Environ. Interact.

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There is currently little information on the sea cage O 2 levels in S. aurata aquaculture, but variation in the above mentioned factors is expected to cause variable levels of O 2 in S. aurata production systems as well. In order to develop production strategies ABSTRACT: We investigated the effect of temperature on the limiting oxygen saturation (LOS) of gilthead sea bream Sparus aurata. This threshold was defined as the % O 2 saturation where fish no longer upheld their routine metabolic rate (RMR, the metabolic rate of fed and active fish) during a progressive decline in oxygen saturation. S. aurata (398 ± 10 g, mean ± SE) were kept in 3 replicate tanks and subjected to 3 changes in temperature: 16 to 20°C, 20 to 16°C and 16 to 12°C. At each temperature, fish were left to acclimatize for 8 to 10 d, before daily feed intake (DFI), the routine oxygen consumption rate (routine MO 2 , mg kg −1 min −1) and the LOS were measured. In addition, at 20°C the swimming speed was measured in fish subjected to a decline in O 2 from full air saturation to levels below the LOS (minimum of 8−10% O 2 ). For the temperature range tested (12−20°C), DFI, MO 2 and LOS increased exponentially with temperature (7.5-, 3.6-and 2.2-fold, respectively) with mean (± SE) LOS being 17 ± 1, 21 ± 0 and 35 ± 5% O 2 at 12, 16 and 20°C, respectively. A gradual decline in swimming activity was observed as O 2 declined below the LOS, indicating increasing metabolic stress and/or a 'sit-out' coping strategy which may prolong survival time in severe hypoxia. The results show the importance of temperature as an influential variable over the environmental O 2 requirements of S. aurata.

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Section: Fish Materials and Experimental Facilitiesmentioning

confidence: 99%

Section: Calculations and Statisticsmentioning

confidence: 99%

Effect of temperature on the metabolism, behaviour and oxygen requirements of Sparus aurata

Remen¹,

Nederlof²,

Folkedal³

et al. 2015

Aquacult. Environ. Interact.

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show abstract

“…The fish were fed one meal a day lasting for approximately 30 min using automatic belt feeders. Waste feed collection and calculation of feed intake was done according to Helland et al (1996). The fish were kept in sea water (salinity 32 ppt) with average temperature 9.4 °C (range 7.8 °C -11.2 °C), and at continous light.…”

Section: Main Trialmentioning

confidence: 99%

Effects of dietary moisture content of extruded diets on physical feed quality and nutritional response in Atlantic salmon (Salmo salar)

et al. 2014

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Feed pellets in modern aquaculture must be of high physical quality to withstand mechanical impacts. However, physical quality of feed has been shown to affect nutritional responses. In the present study, different moisture contents were used to modify physical feed qualities.Effects of dietary moisture content on physical feed quality, feed intake, nutrient digestibility and growth performance in Atlantic salmon were investigated. Different drying times of four commercial-like extruded diets resulted in in dry matter contents of 95.9%, 94.1%, 92.3%, 90.8%. A fifth diet containing 70% dry matter was made

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“…In this study, measurement of feed intake was very imprecise, which may have masked important effects. In another study, in which feed distribution and waste were accurately measured in Atlantic salmon reared in separate family tanks [14], inter-family variations in feed efficiency were detected [23,40]. However, this family effect may have been overestimated because within-family variance could not be estimated.…”

Section: Introductionmentioning

confidence: 97%

Genetic variability in residual feed intake in rainbow trout clones and testing of indirect selection criteria (Open Access publication)

et al. 2008

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-Little is known about the genetic basis of residual feed intake (RFI) variation in fish, since this trait is highly sensitive to environmental influences, and feed intake of individuals is difficult to measure accurately. The purpose of this work was (i) to assess the genetic variability of RFI estimated by an X-ray technique and (ii) to develop predictive criteria for RFI. Two predictive criteria were tested: loss of body weight during feed deprivation and compensatory growth during re-feeding. Ten heterozygous rainbow trout clones were used. Individual intake and body weight were measured three times at threeweek intervals. Then, individual body weight was recorded after two cycles of a three-week feed deprivation followed by a three-week re-feeding. The ratio of the genetic variance to the phenotypic variance was found high to moderate for growth, feed intake, and RFI (VG/ VP = 0.63 ± 0.11, 0.29 ± 0.11, 0.29 ± 0.09, respectively). The index that integrates performances achieved during deprivation and re-feeding periods explained 59% of RFI variations. These results provide a basis for further studies on the origin of RFI differences and show that indirect criteria are good candidates for future selective breeding programs. rainbow trout / clone / residual feed intake / indirect criteria / selection

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A simple method for the measurement of daily feed intake of groups of fish in tanks

Cited by 273 publications

References 6 publications

Effect of temperature on the metabolism, behaviour and oxygen requirements of Sparus aurata

Effect of temperature on the metabolism, behaviour and oxygen requirements of Sparus aurata

Effects of dietary moisture content of extruded diets on physical feed quality and nutritional response in Atlantic salmon (Salmo salar)

Genetic variability in residual feed intake in rainbow trout clones and testing of indirect selection criteria (Open Access publication)

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