Effects of density on growth rates of four benthic diatoms and variations in biochemical composition associated with growth phase

Viçose, G. Courtois de; Porta, Atilio Andrés; Viera, M. P.; Fernández‐Palacios, H.; Izquierdo, M.S.

doi:10.1007/s10811-012-9799-z

Cited by 28 publications

(15 citation statements)

References 58 publications

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“…As a control, a culture of microalgae in a 1 L Erlenmeyer flask, under standard conditions (25°C, 35 of salinity and controlled light 260 µmol photon m 2 s -1 for 24 h), containing 700 mL Guillard & Ryther medium (F/2) (Guillard & Ryther, 1962;Renaud et al, 1994) with 0.88 mol L -1 of nitrogen and 0.32 mol L -1 of silicate. For each treatment, 700 mL of medium with different nitrate (N/4: 0.44 mol L -1 , N/8: 0.22 mol L -1 and N/16: 0.11 mol L -1 of NaNO3 in Guillard F/2 medium) and silicate (Si/4: 0.16 mol L -1 , Si/8: 0.08 mol L -1 and Si/16: 0.04 mol L -1 of Na2SiO3.9H2O in F/2 Guillard medium) concentrations were utilized in otherwise standard F/2 medium (Affan et al, 2007;Fakhry & El-Maghraby, 2015). All cultures were grown for seven days per triplicate under the same standard conditions.…”

Section: Algal Strain and Culture Conditionsmentioning

confidence: 99%

Effect of the deficiency of nitrate and silicate on the growth and composition of the benthic diatom Navicula incerta

Encinas-Arzate¹,

Márquez‐Ríos²,

López‐Elías³

et al. 2020

Lat. Am. J. Aquat. Res.

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Navicula incerta is a benthic diatom with potential use in nutrition and health for humans and aquaculture. Therefore, it is important to know its optimal growth conditions and biochemical composition. In this study, the effects of nitrate and silicate concentration on the growth kinetics and biochemical composition of N. incerta under laboratory conditions were measured. F/2 media was used as the control, and different concentrations of nitrogen (N/4, N/8 and N/16) and silicates (Si/4, Si/8 and Si/16) were evaluated. We measured cell concentration, chlorophyll-a and conducted proximal chemical analyses. It was found that different concentrations of nutrients affected the diatom’s growth kinetics and affected the concentrations of ash, chlorophyll, protein, lipids and carbohydrates. The highest concentration of lipids was obtained in the limiting treatment of nitrogen N/8 (27.09%), while the lowest value was found with silicate Si/8 media (16.97%). Carbohydrates increased compared to the control, with the N/16 treatment presenting the maximal concentration (23.31%). Treatments with reduced nitrate (N/8 and N/16) demonstrated the lowest concentrations of protein (18.75 and 12.44%, respectively), while in reduced silicate treatments, no statistical differences (P ≥ 0.05) were observed. Therefore, media limited nitrogen and silicates affected the growth kinetics and proximal chemical composition of N. incerta. The growth of this species using the N/8 medium is a suitable method for increasing lipid concentration in N. incerta.

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Section: Algal Strain and Culture Conditionsmentioning

confidence: 99%

Effect of the deficiency of nitrate and silicate on the growth and composition of the benthic diatom Navicula incerta

Encinas-Arzate¹,

Márquez‐Ríos²,

López‐Elías³

et al. 2020

Lat. Am. J. Aquat. Res.

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“…Previous studies on H. tuberculata coccinea have successfully contributed to the development of production techniques for this species (Viera et al . ; Bilbao, Tuset, Viera, Courtois de Viçose, Fernández‐Palacios, Haroun & Izquierdo ; Courtois de Vicose, Viera, Bilbao & Izquierdo ; Viera, Courtois de Vicose, Gómez‐Pinchetti, Bilbao, Fernández‐Palacios & Izquierdo ; Courtois de Vicose, Porta, Viera, Fernández‐Palacios & Izquierdo ; Courtois de Vicose, Viera, Huchette & Izquierdo ). However, a commercial grow‐out system is still to be developed.…”

Section: Introductionmentioning

confidence: 99%

Grow-out culture of abaloneHaliotis tuberculata coccineaReeve, fed land-based IMTA produced macroalgae, in a combined fish/abalone offshore mariculture system: effect of stocking density

et al. 2014

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Haliotis tuberculata coccinea has been identified as a target species for European aquaculture development, in order to fulfil the rising demand for abalone. The effects of different stocking densities on the growth performance, feed utilization and survival of two different initial size groups (30 and 40 mm) of abalones, during the final grow‐out to cocktail/market size (45–60 mm), were determined over a 6‐month period. Trials were performed in abalone cages installed in a commercial open‐sea cages fish farm. Animals were fed the red algae Gracilaria cornea and the green one Ulva rigida, both obtained from a land‐based integrated multi‐trophic aquaculture system. Survival rates were very high (94–98%) regardless the density employed. Sustained high linear growth was recorded both in shell and weight. However, a 17–19% reduction in weight gain was obtained by doubling the initial stocking density, suggesting a higher competition for space or food. Nevertheless, the high growth performance (70–94 μm day−1; 250–372% weight gain) and survival attained, even at high densities, denoted the suitability of the offshore mariculture system as well as the biofilter produced macroalgae for grow‐out culture of H. tuberculata coccinea that overall could reach cocktail/commercial size in only 18–22 months.

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“…For aquaculture purposes, the culturing strategy requires a compromise between biomass optimization and harvesting to avoid leading cell metabolism towards exclusive lipid synthesis, because carbohydrates are required to avoid fish fat digestion, and proteins containing essential amino acids to obtain good levels of fish growth and reproduction [17,35,41]. In fact, the proximal chemical analysis of H. coffeaeformis revealed protein and lipid contents (g 100 g·DW −1 ) similar to that reported for Navicula incerta [42]. There, lipid content was significantly higher during the stationary growth phase than during the exponential phase, whereas protein content was found to be similar in both growth phases.…”

Section: H Coffeaeformismentioning

confidence: 64%

“…Different to N. incerta, H. coffeaeformis showed a marked increase in carbohydrate content, as was observed in the benthic diatom Proschkinia sp. [42]. On the other hand, in the diatoms Thalassiosira pseudonana [43] and Nitzschia inconspicua [44] both lipid and carbohydrate contents were higher in the stationary phase, while protein content was lower than that observed in the exponential growth phase.…”

Section: H Coffeaeformismentioning

confidence: 86%

Assessment of Halamphora coffeaeformis Growth and Biochemical Composition for Aquaculture Purposes

Bilbao

Martín

Popovich

et al. 2020

JMSE

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The vast majority of the world's fishery by-products are utilized in the fish farming industry. However, due to the high cost and unsustainability of these by-products, alternative sources must be found. Marine diatoms produce important amounts of fatty acids, sterols, proteins and carbohydrates. In this work, we assessed the nutritional value of Halamphora coffeaeformis at the exponential growth phase, to determine its suitability for aquafeed. The strain was grown in a photobioreactor at 20 • C for 6 days. The production of proteins, lipids and carbohydrates was determined, and essential fatty acid, sterol and amino acid composition was assessed. The highest values of triacylglycerides (TAG), free and esterified sterols, proteins and carbohydrates were found after 6 days of growth in the photobioreactor. Fatty acid analysis by gas chromatography showed the presence of eicosapentaenoic (EPA) and arachidonic (ARA) in amounts similar to those for fish oils. In terms of sterols, a predominance of stigmasterol was observed, followed by cholesterol. The amino acid composition revealed 50% of them to be among those essential for fish and other aquatic animals. Finally, a suitable amount of carbohydrates was found in H. coffeaeformis cultures. Together, these findings support the use of H. coffeaeformis as an alternative and sustainable source for aquafeed to partially replace the use of fishery by-products.

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Effects of density on growth rates of four benthic diatoms and variations in biochemical composition associated with growth phase

Cited by 28 publications

References 58 publications

Effect of the deficiency of nitrate and silicate on the growth and composition of the benthic diatom Navicula incerta

Effect of the deficiency of nitrate and silicate on the growth and composition of the benthic diatom Navicula incerta

Grow-out culture of abaloneHaliotis tuberculata coccineaReeve, fed land-based IMTA produced macroalgae, in a combined fish/abalone offshore mariculture system: effect of stocking density

Assessment of Halamphora coffeaeformis Growth and Biochemical Composition for Aquaculture Purposes

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