Leila Hayashi

Leila Hayashi
Federal University of Santa Catarina | UFSC · Departamento de Aquicultura

About

53
Publications
45,434
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1,415
Citations
Citations since 2016
34 Research Items
1111 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (53)
Preprint
This work evaluated the cultivation of the macroalgae Ulva ohnoi on the performance of algal biomass and changes in its proximate and biochemical composition after cultivation in a biofloc system. U. ohnoi was cultivated in three experimental units with aeration, heating, initial density of 6 g L ⁻¹ for 28 days. The water used for cultivation was c...
Article
Full-text available
This study evaluated the combined use of the brown seaweeds Sargassum filipendula (S) and Undaria pinnatifida (U) dry biomass as feed additive for Pacific white shrimp reared in biofloc system, and its effect on shrimp performance, gut microbiota, hemato-immunological parameters, resistance to acute thermal stress and challenge with White Spot Synd...
Article
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Highlights 1. This policy brief highlights key challenges that must be addressed for the long-term sustainability of the global seaweed industry, ensuring its role in providing nature-based solutions within the sustainable ocean economy agenda and in contributing to the UN Decade of Ocean Science for Sustainable Development (2021-2030). 2. Seaweed...
Article
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This work aimed to establish the nutrient fertilization regime for indoor maintenance of Kappaphycus alvarezii seedlings during periods of low sea temperatures using biofloc effluent as a fertilizer. Moreover, we evaluated the development of seaweed seedlings after transplantation into the sea cultivation in Santa Catarina, Brazil. Seedlings were f...
Article
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The feasibility of strain selection using tetraspore and carpospore progeny from wild fronds of Chondracanthus teedei to obtain strains with high growth rates, tolerance to temperature, and high yield of native carrageenan was investigated. A total of 34 strains were isolated, 14 from gametophytic progenitors and 20 from tetrasporophytic progenitor...
Article
This study evaluated the effect of carrageenan from Kappaphycus alvarezii on the growth and health parameters of the Pacific white shrimp Litopenaeus vannamei. Shrimp (initial weight 4.5 ± 0.5 g) were farmed in 800 L tanks for five weeks, at a density of 30 shrimp tank⁻¹, under controlled temperature (28.5 °C), constant aeration, 100% water exchang...
Article
Full-text available
The aim of this work was to evaluate the use of effluent from a Biofloc System (BFT) as a fertilizer for the red seaweed Kappaphycus alvarezii cultivated in tanks and analyze its influence on carrageenan yield and quality. Firstly, the optimum effluent concentration and period for enrichment were determined by an in vitro study. The seedlings were...
Article
Full-text available
This work evaluated the use of effluent from a marine shrimp biofloc rearing system to cultivate the green seaweed Ulva. First, the growth of two Ulva species, U. ohnoi and U. fasciata, was evaluated. Second, the best-performing species was cultivated under two different stocking densities (2 g L-1 and 4 g L-1) to evaluate both growth and nutrient...
Article
This work aimed to evaluate the effects of integrated culture of sea lettuce (Ulva fasciata) on the shrimp (Litopenaeus vannamei) and mullet (Mugil liza) rearing in a biofloc technology (BFT), on water quality, animal performance and seaweed growth, nitrogen and phosphorus recovery, seaweed bioactive compounds. Two groups were compared: i) Ulva gro...
Article
Full-text available
This work aimed to verify the effects of adding CO2 and irradiance to Kappaphycus alvarezii cultivation. Thalli were cultured in vitro for 2 weeks under low irradiance (50 μmol photons m−2 s−1) with the addition of CO2 according to the following concentrations: 142× 103 ppm (1CO2, 0.1 L min−1), 285 × 103 ppm (2CO2, 0.2 L min−1) and 428 × 103 ppm (3...
Chapter
Full-text available
Abstract A detailed understanding of physiological and reproductive processes in seaweeds has repeatedly proven to be an essential pre-requisite in the successful development of a sustainable industry. The prime example of this was the classical discovery of the “conchocelis”- phase of Pyropia (Porphyra) by Kathleen Mary Drew-Baker in 1949. Such el...
Article
Dietary supplementation with seaweeds has the potential to improve the immune response and physiological performance of marine shrimp under stressful conditions. This work evaluated the effect of dietary supplementation using different ratios of the brown seaweeds Sargassum filipendula (S) and Undaria pinnatifida (U) on the gut microbiota as well a...
Conference Paper
Full-text available
Experimental cultivation of the seaweed Kappaphycus alvarezii has been made in Sambaqui Beach located in the Bay of Santa Catarina Island (BoSCI), Southern Brazil since 2008. K. alvarezii is an introduced species so the environmental monitoring in the surrounding production area is mandatory. This work is the first step towards the understanding of...
Article
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Seaweed farming has now expanded across several continents from South East Asia to South America, Northern Europe, Canada and East Africa, contributing to global food security, supporting rural livelihoods, alleviating poverty and improving the health of oceans. Latin America (LA) covers a vast geographical area, which includes four different ocean...
Article
In 1998 Critchley and Ohno published the book Seaweed resources of the world presenting a synthesis of knowledge on the subject from different regions and countries globally. One chapter by E.C. Oliveira was focused on Brazil. In this article, we present an update of the economically relevant species of Brazilian seaweeds, and their distribution al...
Article
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Multipotent stromal cells stimulate skin regeneration after acute or chronic injuries. However, many stem cell therapy protocols are limited by the elevated number of cells required and poor cell survival after transplantation. Considering that the beneficial effects of multipotent stromal cells on wound healing are typically mediated by paracrine...
Article
Carrageenan is a thermoreversible polymer of natural origin widely used in food and pharmaceutical industry that presents a glycosaminoglycan-like structure. Herein, we show that kappa-type carrageenan extracted by a semi-refined process from the red seaweed Kappaphycus alvarezii displayed both chemical and structural properties similar to a commer...
Article
Full-text available
Planning and regulation of marine farms in Santa Catarina State, Southern Brazil, are designed to meet the interests of traditional communities. Public bidding documents of aquaculture sites elaborated from 2011 to 2013 provide information about the capacity of mariculture production in this state, which, together with the productivity indicators o...
Article
Abrupt changes in water quality parameters affect strongly the growth, survival and resistance to disease of farmed marine shrimps. However, unlike the determination of the toxic levels of substances affecting 50% of the population, standard protocols to nontoxic stressors tests are often neglected. The main objective of this work was to establish...
Article
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Abstract - A new flotaton model for the experimental culture of macroalgae Kappaphycus alvarezii (Doty) Doty ex P.C. Silva is described and illustrated. The ellipsis-shaped 90L apparatus is made of medium density virgin polyethylene, measuring 2000mm long x 300mm wide x 200mm high, and weighing 9kg. The device has been successfully tested in the lit...
Chapter
Kappaphycus and Eucheuma species have been successfully cultivated in Southeast Asia since the early 1970s. The increasing global demand for carrageenan in processed foods and thereby the need for industrial-scales of biomass to be provided to feed an extraction industry, exceeded wild stock availability and productivity and commercial demands coul...
Article
Full-text available
This study evaluated the midgut microbiology, hemato-immunological parameters and the resistance to thermal shock of the white-leg shrimp Litopenaeus vannamei fed with diets containing 0.5, 2, and 4% of the brown seaweeds Undaria pinnatifida and Sargassum filipendula. Shrimp were reared in clear seawater for 15 days in seven 800-L tanks with 100 sh...
Article
Pacific white shrimp, Litopenaeus vannamei, is a tropical species known to be intolerant to cold. In our earlier work, increased thermal shock resistance caused by Sargassum filipendula raised unanswered questions about the mechanisms responsible for this resistance. Therefore, in the present work, we used MALDI-TOF MS mass spectrometry to assess p...
Article
The growth and metabolic profile of the red seaweed Kappaphycus alvarezii were evaluated after in vitro cultivation with effluents from Pacific shrimp Litopenaeus vannamei farming in bioflocs system (BFT) and commercial extract of the brown seaweed Ascophyllum nodosum (AMPEP). Seaweeds were cultivated for 35 days in sterilized seawater enriched wit...
Article
Full-text available
The expansion of shrimp farming is limited by dependency on fish meal and fish oil as the main sources of protein and lipids. Alternative sources of protein could decrease production costs, making shrimp farming more sustainable. Therefore, this paper aimed to evaluate the growth performance of Litopenaeus vannamei (formerly Penaeus vannamei), also...
Conference Paper
Full-text available
In previous study, shrimp fed with diets containing 0.5 and 2% of the brown algae Sargassum filipendula showed higher survival to thermal shock (about 97% against 43% of control group). It raised the question about the mechanism behind this thermal resistance caused by S. filipendula. Thus, the present study aimed to evaluate the lipid and protein...
Conference Paper
Full-text available
The white-leg shrimp Litopenaeus vannamei were fed with diets contained 0.5%, 2% and 4% of brown seaweeds Undaria pinnatifida or Sargassum filipendula (dry mass). The resistance to thermal shock as well as the immunological parameters and microbiology of digestive tract were evaluated. Shrimp cultivation was made clear water system for two weeks in...
Article
Spindle inhibitors and phytoregulators are substances largely used to improve the growth of plants with commercial interest. This study analyzes the effects of colchicine (Ch) and oryzalin (Oz), two spindle inhibitors, on the survival and growth rates of Kappaphycus alvarezii micropropagules when combined in cultures with such phytoregulators as in...
Article
Full-text available
The European, Canadian, and Latin American seaweed industries rely on the sustainable harvesting of natural resources. As several countries wish to increase their activity, the harvest should be managed according to inte- grated and participatory governance regimes to ensure pro- duction within a long-term perspective. Development of regulations an...
Article
This study evaluates the effect of different drying temperatures on the properties of semi-refined (SR) and refined (R) carrageenan extracted from Kappaphycus alvarezii cultivated in Brazil. Drying kinetics was studied in seaweeds under the following treatments: sun drying (control) and drying at 40, 60, and 90 °C in convective air dryer. Drying wa...
Article
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Based on their distinct physiological characteristics, we postulated that different strains of Gracilaria birdiae (Gracilariales, Rhodophyta) would have distinct performances when grown in the sea. Samples from a northeastern Brazil population, including red (RD-CE), greenish-brown (GB-CE), and green (GR-CE) strains, and one red strain (RD-ES) from...
Article
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The Latin American seaweed industry plays an important role at a global scale as 17 % of all seaweeds and 37 % of red seaweeds for the phycocolloid industry comes from this region. Increased market demand for algal raw materials has stimulated research and development into new cultivation technologies, particularly in those countries with economica...
Article
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This study aims to optimize an alternative method of extraction of carrageenan without previous alkaline treatment and ethanol precipitation using Response Surface Methodology (RSM). In order to introduce an innovation in the isolation step, atomization drying was used reducing the time for obtaining dry carrageenan powder. The effects of extractio...
Article
Full-text available
Kappaphycus alvarezii (Rhodophyta, Gigartinales) is a red algae widely cultivated as the main source of raw material for the carrageenan industry. This hydrocolloid is normally used in the food industry as a gelling and stabilizing agent. The facility of its commercial farming based on vegetative propagation promoted the success of the aquaculture...
Article
Full-text available
Kappaphycus alvarezii is a red alga that is commercially important as a source of carrageenan. Since K. alvarezii presents large phenotypic plasticity and rarely develops reproductive structures in culture, identification of gametophytic and tetrasporophytic phases in cultivation systems are difficult. The aim of this study was to determine the plo...
Article
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This study analyzes the callus ontogeny of the Kappaphycus alvarezii brown strain tetrasporophyte using micropropagation and tissue culture. Calli were induced from axenic explants and grown for 2 months. Ontogenic analysis was made in explants collected from days 7 to 60 of culture and observed under light and transmission electron microscopy (TEM...
Article
Full-text available
Kappaphycus alvarezii was cultured in vitro under salinities ranging from 15 to 55psu for 35days to determine the differential effect on growth rate, carrageenan yield, and cellular structure. Plants kept in 15psu died after 3days, while plants cultured in 55psu presented low growth rates during the entire experimental period (0.28% day−1). Plants...
Article
Four strains of Kappaphycus alvarezii were cultivated in the subtropical waters of Florianópolis, Santa Catarina State, Brazil (27°29′19′′ S/48°32′28′′ W), from February 2009 to February 2010. Seaweeds were cultivated on floating raft near of mussel farms. Salinity ranged from 29 to 36psu and temperature from 17.1 to 28.5°C. Higher growth rates (5....
Chapter
Full-text available
Global warming is of increasing concern worldwide. The question of how to mitigate the CO2 released into the atmosphere is the most topical issue, and sustainable solutions are constantly being sought. Aquaculture has been proposed as one method for the sequestration or immobilization of CO2 through filtration or mechanical/chemical processes for l...
Article
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ABORDAGEM ALTERNATIVA PARA O MONITORAMENTO AMBIENTAL DE ESPÉCIES EXÓTICAS INTRODUZIDAS PARA FINS DE MARICULTURA: O CASO DO CULTIVO DE Kappaphycus alvarezii (RHODOPHYTA, SOLIERIACEAE) NO BRASIL. A introdução de espécies exóticas tem sido uma das alternativas para atender a crescente demanda de produtos derivados da aqüicultura. Este tema gera contro...
Article
The potential of the red alga Kappaphycus alvarezii to remove nutrients was tested to treat effluents of Trachinotus carolinus fish cultivation, and the production of carrageenan in this condition was analyzed. Experiments were conducted in four tanks of 8000 L with approximately 1200 fishes of 30 g each integrated with three tanks of 100 L with 70...
Article
Tissue culture techniques were applied for micropropagation of the red alga Kappaphycus alvarezii in order to select the best strain and experimental system for in vitro culture. Five strains were tested: brown (BR), green (GR) and red (RD) tetrasporophytes, brown female gametophyte (BFG), and a strain originating from tetraspore germination (“Edis...
Article
Full-text available
The yield and the quality of carrageenan depend, among other things, on the cultivar or strain and on the cultivation and processing techniques. This work presents carrageenan yields and some properties of Kappaphycus alvarezii under selected cultivation conditions i.e. cultivation period, depth and planting density. Growth rates (GR) ranged from 5...
Article
Full-text available
Growth rate, semi-refined and refined carrageenan yields, 3,6-anhydrogalactose and sulphate contents, and gel strength were investigated in four strains of Kappaphycus alvarezii (brown, green and red tetrasporophytic strains, and one strain derived from tetraspores progeny, called G11) farmed in subtropical waters of São Paulo State, Brazil. All st...
Chapter
Tissue culture techniques were applied for micropropagation of the red alga Kappaphycus alvarezii in order to select the best strain and experimental system for in vitro culture. Five strains were tested: brown (BR), green (GR) and red (RD) tetrasporophytes, brown female gametophyte (BFG), and a strain originating from tetraspore germination (“Edis...

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