Sargassum polycystum is one of seaweed what be able to produce alginate. Cultivation development intensively use common cultivation methods and planting age of growth season properly which can be able to produce good growth and highest alginate. This study is used an experimental method. The basic design used for the content of alginate S. polycystum use completely randomized design (CRD) with Split Plot Design which repeated 3 times. The main plot of this study is a method of cultivation are included by floatting method and bottom method and Subplot is age after planting are consist of 7, 14, 21 and 28 days. The cultivation result of S. polycystum by bottom method with 28 days, showed the highest growth rate about 17.38 g.day-1, while the lowest growth were founded on bottom method on age 7 days about 3.42 g.day-1. The Results of analysis of variance showed that the interaction of cultivation method and planting age have significant effect on the subtances of alginate from S. polycystum. The highest alginate are produced by bottom method of planting age on 28 days about 58.33%. The Lowest alginate are produced by floating and bottom methods of planting age on 7 days about 11.67%. Quality of alginate farmed bottom methods of color is more yellowish than the cultivation of the floating method.
Pedalen Beach, Kebumen, has a type of water substrate consists of sand, coral fragments, and coral overgrown with macroalgae. This study aims to determine the species diversity and distribution pattern of Phaeophyta found in that waters. This research is to explore and utilize macroalgae as a sustainable alginate resource. This study uses a survey method, employing the line transect method randomly. The research variables were species diversity and the distribution pattern of Phaeophyta. The main parameters were the number of species and individuals of each species. Supporting parameters include current velocity, nitrate content, brightness, depth, tide, salinity, temperature, and pH. The data were analyzed using the Shannon-Wiener diversity index (H’) to determine the level of species diversity and the Morisita distribution index (Id) to describe the distribution pattern of macroalgae species. We found five Phaeophyta species consisting of Padina australis, Dictyota dichotoma, Turbinaria ornata, Sargassum crassifolium, and S. polycystum. The diversity of Phaeophyta is classified as low diversity index value (H’) with distribution patterns of uniform macroalgae species. The results of the measurement of physical and chemical factors of the waters showed that the condition of the Pedalen Beach waters was quite good for the growth of Phaeophyta. Keywords: alginate, macroalgae species, Phaeophyta, water substrate
Perairan Pantai Karangtengah Nusakambangan Cilacap memiliki berbagai macam tipe substrat yaitu pasir, karang, dan campuran. Kondisi pantai dengan banyak tipe substrat memungkinkan berbagai spesies rumput laut untuk tumbuh. Informasi terkait keanekaragaman dan dominansi spesies rumput laut penghasil hidrokoloid di perairan Pantai Karangtengah belum banyak diteliti. Penelitian ini bertujuan untuk mengetahui keanekaragaman dan dominansi rumput laut penghasil hidrokoloid pada substrat yang berbeda di perairan Pantai Karangtengah Nusakambangan Cilacap. Penelitian ini menggunakan metode survei dengan teknik pengambilan sampel yaitu metode transek acak terpilih. Sebanyak enam garis transek dibuat secara tegak lurus dengan garis pantai dan jarak antar transek 25 m. Setiap transek dibuat tiga plot yang masing-masing plot berukuran 1x1 m berdasarkan substratnya (karang, pasir, dan campuran). Parameter utama yang diamati yaitu jumlah biomassa dan jumlah spesies. Parameter pendukung yang diamati adalah faktor lingkungan yaitu temperatur, salinitas, pH, kecepatan arus dan kedalaman. Jumlah spesies rumput laut hidrokoloid yang ditemukan sebanyak 10 spesies rumput laut dengan rincian 5 spesies penghasil alginat, 3 spesies penghasil agar, dan 2 spesies penghasil karaginan. Nilai indeks keanekaragaman di perairan pantai karangtengah antara 0,6-2,0 tergolong keanekaragaman sedang. Nilai indeks dominansi di perairan Pantai Karangtengah antara 0,2-0,6 tergolong dominansi rendah.
Microalga Navicula sp., Spirulina platensis, and Chlorella vulgaris have the prospect of being a source of biofuel producers. Rapid cell growth, coupled with the ability to produce large lipids and less pollution, can be used as an alternative to biofuel development. Microalgae cultivation can utilize tapioca liquid waste. Addition of NaCl to regulate salinity, so optimum for microalgae growth. In addition it can reduce toxins by binding to dissolved cyanide acid present in the waste. This study aims to determine the effect of NaCl concentration on tapioca liquid waste on growth and lipid microalgae content. This study used an experimental method with a complete random factorial design. The first factor tested three species of microalgae. The second factor tested seven NaCl concentrations on tapioca liquid waste media. The results showed that the concentration of NaCl 35% in tapioca liquid waste culture media capable of producing biomass of C. vulgaris cells with the highest lipid content. The NaCl concentration capable of producing the highest microalgae biomass from the study can be developed to design more effective and efficient tapioca industrial waste treatment without damaging the environment but more productive, as a biofuel producer.
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