&lt;b&gt;Imbalances in the hardness/alkalinity ratio of water and Nile tilapia’s growth performance&lt;/b&gt; - doi: 10.4025/actascitechnol.v36i1.18995

Cavalcante, Davi de Holanda; Caldini, Nayara Nunes; Silva, Jéssica Lucinda Saldanha da; Lima, Francisco Roberto dos Santos; Sá, Marcelo Vinı́cius do Carmo e

doi:10.4025/actascitechnol.v36i1.18995

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…Temperature was maintained at optimal performance values for Nile tilapia (Silva et al, 2019). In terms of hardness values and the hardness: alkalinity ratio were within values that do not affect the zootechnical performance of tilapia juveniles, according to the literature (Cavalcante et al, 2012;2014).…”

Section: Resultssupporting

confidence: 54%

Nile tilapia nursery feeding management in a biofloc system

et al. 2022

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Nile tilapia (Oreochromis niloticus) has an opportunistic omnivorous feeding behavior and studies have demonstrated the consumption of microorganisms by the species from bioflocs, especially in the early phases of life. One may thus assume that when reared in biofloc systems, there may be a reduction in the feeding rates in the Nile tilapia nursery system when compared to the ponds. This study evaluated the effects of different feeding management options in Nile tilapia nurseries in a biofloc system. A total of 700 fingerlings (2.37 ± 0.55 g) were stocked in 20 experimental units (100 L) and inoculated with mature biofloc for the evaluation of five different feeding management options. After 49 days, it was observed that the higher feed rates caused an increase in nitrogen compounds and solids in the water, worsening the feed conversion rate. Furthermore, the excess feed supplied to the tilapia in the biofloc caused a reduction in the utilization of protein nitrogen, an increase in the liver and visceral fat, in addition to an increase in the production of solids and consumption of alkalinizer by fish biomass. On the other hand, low feeding rates cause a decrease in the growth and uniformity of the tilapia juveniles. Taking the results into consideration, it is recommended to use the feed management option proposed in treatment TC (26% below the highest feed rate) in the tilapia nursery in the biofloc system.

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Section: Resultssupporting

confidence: 54%

Nile tilapia nursery feeding management in a biofloc system

et al. 2022

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“…The dolomitic limestone (CaMgCO 3 ) added to both systems in the present study in order to deliver adequate water alkalinity also increased total hardness as well as its electric conductivity, which is commonly used to assess nutrient availability in aquatic ecosystems (Boyd, 2015). Holanda Cavalcante et al (2014) suggest that fish handling is safer and animal performance is better in water with total alkalinity to hardness ratio of 1:1 (between 55 and 150 mg/L of CaCO 3 ). Although these parameters varied significantly between production systems during the experiment due to the daily water renewal in CW, the supply of CaMgCO 3 maintained the proportion of 1:1 in both systems.…”

Section: Discussionmentioning

confidence: 99%

Growth performance and health of juvenile tambaqui, Colossoma macropomum , in a biofloc system at different stocking densities

Santos

Izel‐Silva

Fugimura

et al. 2021

Aquaculture Research

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Biofloc systems (BFT) are considered environmentally friendly as they operate with minimal water use, which is enhanced by the performance of specific microbial communities effective in controlling nitrogen by-products that are potentially toxic to animals (Avnimelech, 1999). Currently, production technologies in BFT have been made available mainly for shrimp (Litopenaeus vannamei) (Ferreira et al. 2020) and Nile tilapia (Oreochromis niloticus) (Cao et al., 2020).Despite prospects for the viability to produce tilapia in BFT, legal restrictions in regions like the Amazon restrain the expansion of aquaculture activity with ruling aspects related to deforestation and, consequently, occupation of areas and use of water resources, in addition to culturing non-native species (Benatti & Fischer, 2018;Junk, 1984). In line with this, BFT can be considered a strategy to extend aquaculture. However, in order to be economically feasible, production intensification is frequently required as well as the target organism to tolerate higher densities (Krummenauer et al., 2011). Thus, the knowledge on the response of the most important species in the Amazon, such as the tambaqui (Colossoma macropomum) in BFT systems, can contribute to develop aquaculture in the tropical region worldwide.

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“…The provision of ready-made antibody molecules can help stimulate the non-specific immune system in fish. The normal range for water quality variables in tilapia cultivation is temperature 25°C–32°C, pH 6.5–8.5, dissolved oxygen ≥3 mg/L [ 45 ], TAN for rearing red tilapia 0.17–3.87 mg/L [ 46 ], and TDS of <1000 ppm [ 47 ]. The water quality data showed that fish mortality was not related to poor water quality.…”

Section: Discussionmentioning

confidence: 99%

Chicken Enterococcus faecalis-induced immunoglobulin Y as a prophylactic and therapeutic agent against streptococcosis in red tilapia (Oreochromis hybrid)

Rizkiantino¹,

Pasaribu

Soejoedono

et al. 2023

Vet World

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Background and Aim: Streptococcosis is a common bacterial disease in red tilapia, in which Enterococcus faecalis infection has not been widely reported. This study aimed to evaluate the efficacy of pellets that contain chicken E. faecalis-induced immunoglobulin Y (IgY) to treat and prevent streptococcosis in red tilapia. Materials and Methods: We conducted a 28-day study for immunoprophylaxis and immunotherapy, each using four groups with two replications: Healthy control fish (KS), non-IgY pellets (PA and TA), pellets with 25% egg yolk containing E. faecalis-induced IgY (PB and TB), and pellets with 50% egg yolk containing E. faecalis-induced IgY(PC and TC). Indirect enzyme-linked immunosorbent assay was performed on prototype pellets produced with an IgY suspension at 1.63 mg/mL as the standard optical density curve. For the immunoprophylaxis study, pellets of 3% of the average body weight of the experimental fish (0.50 g per fish per day) were given daily until day 14 before the challenge test with E. faecalis (2.1 × 109 Colony-forming unit/mL peroral) on day 15. The data from the observation period on days 15–28 were analyzed. For the immunotherapy study, pellets of 3% of the average body weight (0.50 g per fish per day) were given daily for 21 days (days 8–28) 7 day spost-infection. The data from the immunotherapy study were collected during the observation period on days 8–28. Statistical analysis was performed on non-specific immune variables: Total leukocytes, monocytes, lymphocytes, neutrophils, phagocytic activity, and macrophage capacity; and the semi-quantitative distribution of melanomacrophage centers (MMCs) in the lymphoid organs, such as spleen and liver. Photomacrographic data were analyzed descriptively and qualitatively by comparing the healing process and clinical signs found between experiments in the immunotherapy study. Results: The pellet with 50% egg yolk with an IgY at 2.43 mg/g pellet, 3% of body weight once daily, was the best formula on experimental fish. The administration of this formulation can also increase non-specific immunity and the distribution of MMCs in the spleen and liver with a survival rate of 55% for 14 days of challenge period in the immunoprophylaxis study and 70% for 21 days of therapy period in the immunotherapy study. Conclusion: Immunoglobulin Y can be a prophylactic and therapeutic agent against streptococcal infections caused E. faecalis in red tilapia with an optimum dosage of 2.43 mg/g pellet.

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<b>Imbalances in the hardness/alkalinity ratio of water and Nile tilapia’s growth performance</b> - doi: 10.4025/actascitechnol.v36i1.18995

Cited by 12 publications

References 21 publications

Nile tilapia nursery feeding management in a biofloc system

Nile tilapia nursery feeding management in a biofloc system

Growth performance and health of juvenile tambaqui, Colossoma macropomum , in a biofloc system at different stocking densities

Chicken Enterococcus faecalis-induced immunoglobulin Y as a prophylactic and therapeutic agent against streptococcosis in red tilapia (Oreochromis hybrid)

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