Reducing the dietary protein:energy (P:E) ratio changes solubilization and fermentation of rainbow trout (Oncorhynchus mykiss) faeces

Letelier-Gordo, Carlos Octavio; Dalsgaard, Johanne; Suhr, Karin Isabel; Ekmann, Kim Schøn; Pedersen, Palle

doi:10.1016/j.aquaeng.2015.02.002

Cited by 18 publications

(8 citation statements)

References 27 publications

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“…10). Furthermore, different minerals are not released at the same rate, depending on the composition of the feed (Letelier-Gordo et al 2015), thus leading to more complicated monitoring of their concentration in the aquaponic solution .…”

Section: Solubilisationmentioning

confidence: 99%

Aquaponics Food Production Systems

Goddek¹,

Joyce²,

Kotzen³

et al. 2019

200

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The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors, and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, express or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Solubilisationmentioning

confidence: 99%

Aquaponics Food Production Systems

Goddek¹,

Joyce²,

Kotzen³

et al. 2019

200

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show abstract

“…Already the initial concentrations of TAN and PO4 3were high in the FFOW reactors (8.9±0.8 mg TAN/L; 7.6±0.5 mg PO4 3--P/L), which can be explained by the accumulation during the initial fermentation process (Conroy and Couturier, 2010;Letelier-Gordo et al, 2015). Both TAN and PO4 3were slightly reduced in the FFOW reactors (-0.8±0.4 mg TAN/L; -0.3±0.4 mg PO4 3--P/L), probably due to the consumption by the growing microbial biomass.…”

Section: Effluent Qualitymentioning

confidence: 99%

“…Each reactor was evaluated twice on the condition (n=4 for each OCT) with one week of acclimatization time between the operational cycles. The wastewater was prepared as described in the section 2.4, and COD/NO3-N ratios in all treatments were maintained at 6 (300 mg COD/L and 50 mg NO3 --N/L), which has been described as adequate for the denitrification process (Van Rijn et al, 2006;Letelier-Gordo et al, 2015). One hour prior to the new daily cycle, the carbon source and nitrate were added into a fully mixed holding tank (Figure 1).…”

Section: Phase I: Defining Optimal Operational Cycle Timementioning

confidence: 99%

Activated sludge denitrification in marine recirculating aquaculture system effluent using external and internal carbon sources

Letelier-Gordo

Huang

Aalto

et al. 2020

Aquacultural Engineering

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“…Given the effect on growth and protein retention, studies have addressed the importance of the dietary P/E ratio in various fish species such as sea bream ( Sparus aurata ) [37], rainbow trout ( Oncorhynchus mykiss ) [38], parrotfish ( Oplegnathus fasciatus) [39], red-spotted grouper ( Epinephelus akaara) [40], and Nile tilapia ( Oreochromis niloticus ) [41]. However, the dietary P/E ratio varies with many factors such as species, fish size, fish weight, nutrient digestibility, dietary protein sources, protein requirements, life stages, feeding ratio, experimental design, and environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Growth and Metabolic Response of Chinese Perch to Different Dietary Protein-to-Energy Ratios in Artificial Diets

Alam

Liang

Liu

et al. 2019

IJMS

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The effect of dietary nutrients on novel farm species has always garnered wide research and economic interest. Chinese perch, an economically important carnivorous fish, accepts an artificial diet after taming, so it is essential to evaluate and optimize the nutritional and metabolic demands of this species. However, little is known about the effect of an artificial diet on the growth and metabolism of Chinese perch. Therefore, the present study evaluated the growth and metabolic responses of Chinese perch to experimental diets with different dietary protein/energy (P/E) ratios. Five isoenergetic diets (18 kJ/g) with graded levels of P/E ratios of 30.58, 33.22, 35.90, 38.6, and 41.35 mg/kJ (named A, B, C, D, and E) were formulated. A total of 225 Chinese perch (64.89 ± 0.28 g) were divided into five groups (triplicate tanks for each group), distributed into 15 (350 L) fiberglass tanks, and fed twice a day at 4% of fish wet body weight with the respective P/E ratio diets for 10 weeks. Compared with the other groups, Chinese perch in Group C showed significantly improved growth performance, weight gain (WG), specific growth rate (SGR), viscerosomatic index (VSI), hepatosomatic index (HSI), intraperitoneal fat (IPF), feed utilization, feed intake (FI), feed conversion ratio (FCR), protein efficiency ratio (PER), protein retention efficiency (PRE), energy retention efficiency (ERE), and feed efficiency (FE) as well as whole-body, muscle, and liver composition. Chinese perch in Group A, on the other hand, had the lowest growth performance, feed utilization, and body composition compared with the other groups. The activities of nitrogen metabolism-related enzymes (alanine aminotransferase (ALT), aspartate aminotransferase (AST) glutamate dehydrogenase (GDH), and adenosine 5′-monophosphate deaminase (AMPD)) as well as the mRNA expression of the GDH and AMPD genes were significantly lower than those in the other groups. Similarly, the expression of NPY and AgRp were significantly higher in Group C compared with the other groups. However, the gene expression of CART and POMC was not affected by the dietary P/E ratios. In Group A, the expression of mTOR, S6K, and 4EBP1 was significantly lower and that of AMPK, LKB1, and eEF2 was significantly higher when compared with the other groups. Biochemical analysis of blood showed that ALT, AST, total protein (TP), alkaline phosphatase (ALP), glucose (GLU), blood urea nitrogen (BUN), and triglyceride (TG) levels were also affected by the dietary P/E ratio. From our results, we concluded that Chinese perch growth performance and nutrient metabolism were significantly affected by the P/E ratio of the artificial diet. Second-order polynomial regression analysis revealed that Chinese perch growth performance was optimal at a P/E ratio of 37.98 in the artificial diet.

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Reducing the dietary protein:energy (P:E) ratio changes solubilization and fermentation of rainbow trout (Oncorhynchus mykiss) faeces

Cited by 18 publications

References 27 publications

Aquaponics Food Production Systems

Aquaponics Food Production Systems

Activated sludge denitrification in marine recirculating aquaculture system effluent using external and internal carbon sources

Growth and Metabolic Response of Chinese Perch to Different Dietary Protein-to-Energy Ratios in Artificial Diets

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