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Dyahruri Sanjayasari

Fakultas Perikanan dan Ilmu Kelautan, Universitas Jenderal Soedirman

Author-ID : 2982799

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science Social Sciences

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POTENSI KANDUNGAN PIGMEN KLOROFIL a DAN b BEBERAPA RUMPUT LAUT GENUS Gracilaria: OPTIMALISASI KANDUNGAN KARBOHIDRAT Rose Dewi; Dewi Nugrayani; Dyahruri Sanjayasari; Hadi Endrawati
Jurnal Harpodon Borneo Vol 9, No 1 (2016): Volume 9 No 1 April 2016
Publisher : Fakultas Perikanan Dan Ilmu Kelautan Universitas Borneo Tarakan

Response pigment and ecological is major factor of photosynthesis. Quantity of chlorophyll a,b are not same in Gracilaria, though in one genus. Difference fluctuation ecological conditions on waters; (Station 1): estuaries, (Station 2): coastal, (Station 3): 100m from the shoreline, based on literature study will affect the rate of photosynthesis. This research aims need to measure of quantitatively pigments (chlorophyll a,b) and carbohydrate to know the difference. Method by purposive random sampling; chlorophyll a,b using UV-Vis spectrophotometer; carbohydrate with analysis by difference; also control physical and chemical parameters of waters. Results show the chlorophyll a, b and carbohydrates in G. verrucosa (163.58 ± 8.90mg /L;79.32 ± 5.53 mg /L; 37.19 ± 1.50%); G. gigas (128.01 ± 7.2 mg /L;117.76 ± 5,85mg /L; 44.48 ± 0.90% ) and G. salicornia (100.36 ± 23.35mg/L; 93.73 ± 11,59mg/L; 36.94 ± 0.72%). The highest correlation between pigments (chlorophyll b) with the formation of carbohydrate in G. gigas (r = 0.991). Range of water quality measured during the study still the threshold that can be tolerated Gracilaria, found only high phosphorus content above the threshold that 1.935 to 2.517 mg/ L.Key words: G. verrucosa, G. gigas, G. salicornia, Chlorophyll a, b , Carbohydrate

Density and Growth Rate of Nannochloropsis oculata with Different Photoperiods Dyahruri Sanjayasari; Faradita Rahmasari; Imroatun Khasanah; Ainulyakin Imlani
MAIYAH Vol 2 No 1 (2023): Maiyah : Vol.2 No.1 Tahun 2023
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Nannochloropsis oculata is a type of single-celled or eukaryotic phytoplankton belonging to the class Eustigmatophyceae. This type of microalgae is widely used as natural food for rotifers and fish larvae because it has a high nutritional content. Given this role, many species of Nannochloropsis oculata are cultivated by culture. The success of microalgae culture is influenced by growth factors such as light intensity, CO2, temperature, and nutrition. However, in the process problems often arise regarding the unstable growth of Nannochloropsis oculata. This is usually caused by factors that affect growth, such as light that is not optimal. Based on these problems, it is necessary to conduct research that aims to determine the growth rate of Nannochloropsis oculata with different irradiation treatments. The research method used was an experimental method with 4 treatments i.e., A (24L : 0D), B (12L : 12D), C (18L : 6D), and D (6L : 18D). The results showed that different light exposure period on the density of Nannochloropsis oculata microalgae had no significant effect on their growth rate. Even though the results of statistical tests of photoperiod administration did not affect the production of Nannochloropsis oculata microalgae cell density, the treatment with the dark phase resulted in better growth.

Heavy Metal Content of Cadmium (Cd) and Chromium (Cr) in Green Mussels (Perna viridis) and Sediments of Sawojajar Waters, Brebes Dyahruri Sanjayasari; Misyka Syahra Rahmaniyyah; Widya Tri Hastuti; Nuning Vita Hidayati
MAIYAH Vol 2 No 2 (2023): Maiyah : Vol.2 No.2 Tahun 2023
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Green mussel (Perna viridis) is one of the spesies in Bivalve class which filter the food particles from their surroundings. As filter feeder, it captured anything including plankton, detritus, and even heavy metals. Heavy metals content in green mussels could become dangerous due to the bioaccumulation process. This research aimed to determine the levels of heavy metals Cadmium (Cd) and Chromium (Cr) not only in the tissues of green mussels but also in the sediments of Sawojajar waters, Brebes; current study also determined the feasibility of green mussels for consumption in the perspective of food safety. The method used in this research was a field survey method which conducted in June 2022. The analysis method used AAS refers to the American Public Health Association (APHA) with laboratory tests conducted at the Productivity and Aquatic Environment Laboratory of IPB. The results showed that the content of heavy metal Cd in green mussel samples was at 0.19 mg.kg-1 which was meet the threshold concentration. Whereas, the heavy metal Cr in green mussels’ tissue exceeded the threshold of chromium concentration at 0.21 mg.kg-1. In addition, the heavy metal content of Cd and Cr in sediment were still meet the threshold concentration at 3.2 mg.kg-1 and 0.13 mg.kg-1 respectively. In terms of food safety, the EDI (Estiate Daily Intake) value based on the results of heavy metals Cd and Cr concentrations was 0.11 and 0.13 µg.kg-1.day-1 respectively. The result indicated that these heavy metals concentration had low risk in causing health issue. In the same way, the target hazard value (THQ) of Cd and Cr were not exceeded the RfD (Reference Dose) at 0.109 and 0.036 respectively. These value of THQ for both Cd and Cr indicated low risk in causing cancer and the green mussels are meet the food safety standard

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