Growth rates of Eucheuma denticulatum and Kappaphycus alvarezii (Rhodophyta; Gigartinales) cultured using modified off-bottom and floating raft techniques on the Kenyan coast

Kimathi, Alex; Wakibia, Joseph; Gichua, Moses Kirega

doi:10.4314/wiojms.v17i2.2

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…denticulatum compared with Kappaphycus alvarezii was also observed by Kimathi et al. (2018) when both species were cultivated on the coast of Kenya. Several authors have provided explanations for this species‐specific growth variation including differences in morphology, tolerance to ecological factors, and the cell physiology (Doty et al.…”

Section: Discussionsupporting

confidence: 71%

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Growth, nitrate uptake kinetics, and biofiltration potential of eucheumatoids with different thallus morphologies

Narvarte

Genovia

Hinaloc

et al. 2021

Journal of Phycology

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The declining production of commercially important eucheumatoids related to serious problems, like increasing susceptibility to ice–ice disease and epiphytism, may be ameliorated by nutrition. This ushered an increasing interest in incorporating seaweeds into an integrated multi‐trophic aquaculture (IMTA) setup to take up excess inorganic nutrients produced by fish farms for their nourishment. In this regard, it is important to understand the nutrient uptake capacity of candidate seaweeds for incorporation into an IMTA system. Here, we examined the growth, nitrate (NO3‐) uptake kinetics, and biofiltration potential of Eucheuma denticulatum and three strains of Kappaphycus alvarezii (G‐O2, TR‐C16, and SW‐13) with distinct thallus morphologies. The NO3‐ uptake rates of the samples were determined under a range of NO3‐ concentrations (1–48 µM) and uptake rates were fitted to the Michaelis–Menten saturation equation. Among the examined eucheumatoids, only SW‐13 had a linear response to NO3‐ concentration while other strains had uptake rates that followed the Michaelis–Menten saturation equation. Eucheuma denticulatum had the lowest Km (9.78 ± 1.48 µM) while G‐O2 had the highest Vmax (307 ± 79.3 µmol · g−1 · min−1). The efficiency in NO3‐ uptake (highest Vmax/Km and α) was translated into the highest growth rate (3.41 ± 0.58% · d−1) measured in E. denticulatum. Our study provided evidence that eucheumatoids could potentially take up large amount of NO3‐ and fix CO2 when cultivated proximate to a fish farm as one component of an IMTA system. During a 45 ‐d cultivation period of eucheumatoids, as much as 370 g NO3‐ can be sequestered by every 1 kg initial biomass of E. denticulatum growing at 3% · d−1. Furthermore, based on our unpublished photosynthetic measurements, the congeneric K. striatus can fix 27.5 g C · kg−1 DW during a 12 h daylight period.

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Section: Discussionsupporting

confidence: 71%

“…2014, Kimathi et al. 2018). In our study, the growth rates of K. alvarezii (1.08–1.33% · d −1 ) were also comparable to those cultivated in a tank culture system in Malaysia (0.41–1.46% · d −1 ; Zuldin and Shapawi 2014).…”

Section: Discussionmentioning

confidence: 98%

Growth, nitrate uptake kinetics, and biofiltration potential of eucheumatoids with different thallus morphologies

Narvarte

Genovia

Hinaloc

et al. 2021

Journal of Phycology

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“…(Figure 1) The most common technique of seaweed cultivation is the peg and line (off-bottom) monoline method, which involves tying seaweed seedlings to monofilament polypropylene ropes (lines) with the main lines tightly stretched amid two wooden pegs (stakes) drilled securely to the seafloor. Other farming practices including the raft, the net, broadcasting, and floating long-line methods are still being piloted (Kimathi et al, 2018;Nyamora et al, 2018;Brugere et al, 2020;Garcia-Poza et al, 2020;Msuya et al, 2022).…”

Section: Seaweed Farming Projects In Kenyamentioning

confidence: 99%

Towards environmental sustainability: further evidences from decarbonization projects in Kenya’s Blue Economy

Rasowo,

Nyonje,

Olendi

et al. 2024

Front. Mar. Sci.

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Kenya is committed to the global efforts on climate change mitigation and adaptation as seen through investments in various sustainable green and blue economy projects. In this review paper, we present the current status of what has been done, particularly on the blue carbon offset initiatives undertaken in the mangrove and seaweed ecosystems as well as the decarbonization activities at the port of Mombasa and which should form reference information for local, regional, bilateral/multilateral partners, scientists and other climate change stakeholders. The blue carbon offset projects involve mangrove conservation, reforestation and carbon credit sale as well as seaweed farming. The initiatives have several unique features amongst which are the community-led income generation systems that simultaneously act as an inducement for ecosystem preservation, co-management and benefits sharing which are recipes for economic, socio-cultural, and environmental sustainability. A notable project impact is the conferment of economic power to the locals, particularly the women and the youth The model used embraces a collaborative approach involving multisectoral engagements of both the government, multilateral organizations, NGOs, and local communities. This integrated top-down (government) and bottom-up (local community) method deliberately targets the strengthening of economic development while ensuring sustainability.

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“…The main method of cultivation is the bottom monoline technique, which is applied in shallow waters in the nearshore/intertidal zone, allowing the lines to be exposed during the spring low tide. Other cultivation methods such as the raft, broadcasting, and net methods, have not been evaluated for economic feasibility to allow their use in commercial farming (Kimathi et al, 2018). Cultivated and naturally occurring seaweeds, including beachcast ones, are the two major sources of these macroalgae.…”

Section: Growth Habitat and Production Of Seaweedsmentioning

confidence: 99%

Prospects of dietary seaweeds and their bioactive compounds in sustainable poultry production systems: A symphony of good things?

et al. 2022

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Modern poultry production systems face numerous economic, environmental, and social sustainability challenges that threaten their viability and acceptability as a major source of animal protein. As scientists and producers scramble to find cost-effective and socially acceptable solutions to these challenges, the dietary use of marine macroalgae (seaweeds) could be an ingenious option. Indeed, the incredible array of nutritive and bioactive compounds present in these macroscopic marine organisms can be exploited as part of sustainable poultry production systems of the future. Incorporating seaweeds in poultry diets could enhance feed utilization efficiency, growth performance, bird health, meat stability and quality, and consumer and environmental health. Theoretically, these benefits are mediated through the putative antiviral, antibacterial, antifungal, antioxidant, anticarcinogenic, anti-inflammatory, anti-allergic, antithrombotic, neuroprotective, hypocholesterolemic, and hypoglycemic properties of seaweed bioactive compounds. Despite this huge potential, exploitation of seaweed for poultry production appears to be constrained by a variety of factors such as high fibre, phenolics, and ash content. In addition, conflicting findings are often reported when seaweeds or their extracts are used in poultry feeding trials. Therefore, the purpose of this review paper is to collate information on the production, phytochemical components, and nutritive value of different seaweed species. It provides an overview of in vivo effects of dietary seaweeds as measured by nutrient utilization efficiency, growth performance, and product quality and stability in poultry. The utility of dietary seaweeds in sustainable poultry production systems is explored, while gaps that require further research are highlighted. Finally, opportunities that exist for enhancing the utility of seaweeds as a vehicle for sustainable production of functional poultry products for better global food and nutrition security are presented.

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Growth rates of Eucheuma denticulatum and Kappaphycus alvarezii (Rhodophyta; Gigartinales) cultured using modified off-bottom and floating raft techniques on the Kenyan coast

Cited by 9 publications

References 15 publications

Growth, nitrate uptake kinetics, and biofiltration potential of eucheumatoids with different thallus morphologies

Growth, nitrate uptake kinetics, and biofiltration potential of eucheumatoids with different thallus morphologies

Towards environmental sustainability: further evidences from decarbonization projects in Kenya’s Blue Economy

Prospects of dietary seaweeds and their bioactive compounds in sustainable poultry production systems: A symphony of good things?

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