Improvement of the Water Quality in Rainbow Trout Farming by Means of the Feeding Type and Management over 10 Years (2009–2019)

Fiordelmondo, Elisa; Magi, Gian Enrico; Mariotti, Francesca; Bakiu, Rigers; Roncarati, Alessandra

doi:10.3390/ani10091541

Cited by 9 publications

(7 citation statements)

References 21 publications

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“…All water quality variables were within tolerable physiological limits for Rainbow Trout (Fiordelmondo et al. 2020).…”

Section: Resultsmentioning

confidence: 86%

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Improved fecal particle size profile in Rainbow Trout fed feeds containing different ratios of animal meal and plant protein concentrates: Effect on nitrogen and phosphorus partitioning

Welker,

Barrows

2023

N American J Aquac

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In this project, three diets in which fishmeal (FM) (reference diet) was completely replaced with a combination of poultry meal (PM), corn protein concentrate, soy protein concentrate, and guar gum were evaluated to determine the portioning of nitrogen and phosphorus (P) in fecal particle size classes (fines, mid‐size, large; <0.6 mm, 0.6 ‐1.2 mm, >1.2 mm) and compared to a commercial rainbow trout feed. Feces was evaluated for particle size composition and the content of total nitrogen (TN) and total phosphorus (TP) in each size class. There was a significant difference in fecal particle size composition of trout fed the experimental diets compared to the commercial feed. Fish fed the four experimental diets produced feces with approximately 43% large particles and 24% fines, compared to 6% and 67% for the trout fed the commercial diet. The TN in feces of trout fed the FM diet (3.84%) was significantly higher than for the FM‐free diets, which also declined linearly (2.68%, 1.91%, and 1.59%) as the content of PM was replaced with plant‐based protein. An interaction was also observed between diet and particle size on fecal N content in which a significant increase in TN from large particles compared to fines occurred for the experimental FM diet, but there was little difference between size classes for the non‐FM based feeds. The feces of trout fed the FM diet contained more TP (100,007 ug/g) than feces of fish fed the FM‐free diets (46,751 to 72,659 ug/g), likely due to higher dietary P content of FM, but TP concentrations followed a similar trend as TN in the FM‐free feeds, declining as the proportion of plant protein sources increased (and PM decreased). The large fecal particles (72,235 ug/g) contained more TP than the mid‐size particles (68,926 ug/g) or fines (61,974 ug/g), which could be due to leaching in the latter two particle size classes, as the potential for solubility likely increased as particle size decreased. These findings may have important implications for improving the fecal particle size profile for sedimentation and removal of regulated nutrients through formulation of rainbow trout feeds in replacement of FM with plant protein.

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“…All water quality variables were within tolerable physiological limits for Rainbow Trout (Fiordelmondo et al. 2020).…”

Section: Resultsmentioning

confidence: 86%

“…Temperature averaged 15.4°C, pH averaged 7.6, and dissolved oxygen averaged 7.1 mg/L; ammonia-N, unionized ammonia, and nitrate-N averaged 0.12, 0.002, and 21.9 mg/L, respectively. All water quality variables were within tolerable physiological limits for Rainbow Trout (Fiordelmondo et al 2020).…”

Section: General Water Qualitymentioning

confidence: 78%

Improved fecal particle size profile in Rainbow Trout fed feeds containing different ratios of animal meal and plant protein concentrates: Effect on nitrogen and phosphorus partitioning

Welker,

Barrows

2023

N American J Aquac

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“…Besides, the maintenance of a fraction of fish meal was considered prudent by authors to assure good growth results for rainbow trout. To perform the study, we used duckweed collected in freshwater areas, strictly monitored in terms of quality as demonstrated by the analyzed physico-chemical parameters were within the range considered optimal for the rainbow trout species in all the fish groups tested [38]. The survival rate was very high in all the experimental groups.…”

Section: Discussionmentioning

confidence: 99%

Effects of Partial Substitution of Conventional Protein Sources with Duckweed (Lemna minor) Meal in the Feeding of Rainbow Trout (Oncorhynchus mykiss) on Growth Performances and the Quality Product

Fiordelmondo

Ceschin

Magi

et al. 2022

Plants

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Duckweed (Lemna minor) meal was included in the formulation of three experimental feeds (L1, L2, L3) for rainbow trout at 10%, 20%, 28% of the protein source, respectively. Increasing the duckweed inclusion, the other protein sources were adjusted to get isonitrogenous (41%) and isolipidic (20%) diets, as the control diet (LC). 540 fish (mean body weight 124.5 ± 0.7 g) were randomly allocated in 12 tanks divided equally among the four different diets. After 90 days, fish were weighed and the most important productive performances, fillet quality and fatty acid profile were determined. The final body weight in L1 (340.53 g) and L2 (339.42 g) was not different from LC (348.80 g); L3 trout significantly (p < 0.05) exhibited the lowest one (302.16 g). Similar trends were found in final mean length, weight gain, specific growth rate, food conversion rate. Somatic indices were affected by duckweed inclusion. Diets had not significant effects on the proximate composition and fatty acids of the fillet in L1, L2, L3 respect to LC. Based on this study, duckweed meal derived from Lemna minor can be included in the feed for the rainbow trout without negative effects on the growth performances at 20% of the protein substitution.

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“…Water quality contributes to the success of any fish farming enterprise [17][18][19][20]. Managing water quality involves a proper understanding and manipulation of complex interactions between the stocked organisms and their ecosystem to enhance survival for increased productivity [18,20]. On the other hand, fish farm effluents also negatively impact receiving water systems and the environment [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, fish farm effluents also negatively impact receiving water systems and the environment [21][22][23][24]. This results in the general quality degradation of receiving water systems, eutrophication, increased water treatment costs, and other downstream impacts on the environment [18,20,21,25]. The lack of necessary knowledge and skills in fish farm management is a prevalent challenge among African fish farmers [5,10,14,16,24].…”

Section: Introductionmentioning

confidence: 99%

Knowledge, Attitudes, and Practices of Fish Farmers Regarding Water Quality and Its Management in the Rwenzori Region of Uganda

Ssekyanzi

Nevejan

Kabbiri

et al. 2022

Water

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As the number of inhabitants in Sub-Saharan Africa (SSA) increases, demand for animal-source proteins outstrips the current supply. Aquaculture is promoted to sustain livelihood and for improved food security. However, the production in SSA is still low at less than 1% of the total global production. Poor water quality is cited to be one of the factors limiting the growth of the aquaculture sector and is attributed to limited familiarity with standard aquaculture practices. Thus, a knowledge, attitudes, and practices (KAPs) survey was carried out among fish farmers in five districts of the Rwenzori region. Our results showed that 81% and 80% of them had poor knowledge and practices concerning water quality in aquaculture, respectively. Seventy percent did not know that fish farming caused pollution, while 68% believed that there was no need to treat fish farm effluents. Only 45% showed good attitudes towards water quality management. Fish farmers that fed fish with only complete pellets and those that combined them with locally available products (LAP) were 8 and 5 times more likely to possess more knowledge (p < 0.01) on water quality as compared to others that used only LAP. Slight improvements in attitudes and practices for every unit increment in knowledge were observed (p < 0.05). This limited familiarity with water quality management could severely impede the growth of aquaculture, as well as the sustainable utilization of available water resources. Therefore, there is a need for more training and improvement of extension services among fish farming communities.

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Improvement of the Water Quality in Rainbow Trout Farming by Means of the Feeding Type and Management over 10 Years (2009–2019)

Cited by 9 publications

References 21 publications

Improved fecal particle size profile in Rainbow Trout fed feeds containing different ratios of animal meal and plant protein concentrates: Effect on nitrogen and phosphorus partitioning

Improved fecal particle size profile in Rainbow Trout fed feeds containing different ratios of animal meal and plant protein concentrates: Effect on nitrogen and phosphorus partitioning

Effects of Partial Substitution of Conventional Protein Sources with Duckweed (Lemna minor) Meal in the Feeding of Rainbow Trout (Oncorhynchus mykiss) on Growth Performances and the Quality Product

Knowledge, Attitudes, and Practices of Fish Farmers Regarding Water Quality and Its Management in the Rwenzori Region of Uganda

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