Kg Of Seaweed Research Articles

Pendampingan Kelompok Masyarakat Pesisir Dalam Usaha Budidaya Rumput Laut di Desa Sengkol

Empowerment of the poor, including coastal communities, is a national movement launched by the government through various empowerment programs. In order to accelerate development in coastal areas, it is necessary to have programs that can reduce poverty, reduce unemployment and increase economic growth. The purpose of the service activity is the impact of applying seaweed cultivation, analyzing production patterns, and analyzing income from seaweed cultivation. The method of service activities is carried out through an adult education approach. The adult education approach is carried out using the method of mentoring and training for coastal communities. Demonstrations were given to 15 people to cultivate seaweed and each was given 65 kg of seaweed seeds. The result of the service is that there is a positive impact from the application of the seaweed base peg method on the production of household income for coastal communities. The average yield of the first planting was 152.75 kg of wet seaweed for each person and 320 kg for the second planting. The income of coastal communities from seaweed cultivation is an average of IDR 1,280,000

Analysis of the benefits of seaweed farming and its effects on the environment and community activities (study in the city of Tual, Southeast Maluku)

Analysis of the Benefits of Seaweed Farming and Its Effects on the Environment and Community Activities (Study in the City of Tual, Southeast Maluku). This study aims to analyze how much profit and efficiency levels of seaweed farming in the City of Tual Southeast Maluku and their impact on community activities and the surrounding environment. The method used in this research was business analysis. The business analysis method consisted of business income analysis, revenue cost ratio (R/C) analysis, Break Event Point Analysis, Return on investment (ROI), and descriptive qualitative. The results showed that seaweed farming in Tual City was very profitable, with an average profit for small farmers of IDR 15,134,275 and large farmers of IDR 29,927,120. The result of revenue cost ratio analysis in Tual City was very efficient where the average R/C value for small scale seaweed farming was 3.3, and for large scale, the average R/C value was 3.4. In terms of break-even point where a break-even point for small-scale businesses would occur when the price per Kg of seaweed was in the range of IDR 3,987 with an average production of dried seaweed 1163 Kg. For seaweed farming on a large scale where the break-even point would occur when the price per Kg of seaweed was in the range of IDR 3,847 with an average production of 2275 Kg. From the results of the analysis of return on investment obtained an average of 326% for small farmers, and for large farmers amounted to 342%. Besides, the selection of efficient seaweed cultivation so that it does not have too much impact on community activities and the surrounding environment.

Elevated concentration of radioactive potassium in edible algae cultivated in Malaysian seas and estimation of ingestion dose to humans

Although the various benefits of seaweeds are well recognised, potential health hazards are much less well researched, as an instance the possible presence of concentrated levels of natural radionuclides. In present work the concentrations of natural radionuclides in seaweed cultivated in Malaysian seas are assessed using conventional HPGe γ-ray spectrometry. An edible species of seaweed has been collected from several seaweed farms located along coasts of the Andaman and South China Sea. Activity concentrations of 226Ra, 228Ra and 40K in samples collected from Langkawi are observed to be greater than those from Sabah, while 40K radioactivity levels (2.2E3 ± 100 – 3.8E3 ± 180 Bq kg−1) in all samples are noted to be well above the world average value of between 400 and 580 Bq kg−1. The estimated amount of total potassium is in the range 68 – 120 g (kg of seaweed)−1 and 53–106 g kg−1 obtained via ICP-OES, which are in line with data for New Zealand seaweed of between 43.7 and 123 g kg−1. The estimated total effective dose of 84 μSv·y−1 is lower compared to a global internal dose of 290 μSv·y−1 as reported by UNSCEAR. Accordingly, the mean cancer risk from such consumption was also estimated to be slightly lower (1.92 × 10−3) compared to the ICRP cancer risk factor of 2.5 × 10−3 based on the additional annual dose limit of 1 mSv for a member of the general public, which gives an annual mortality probability of 10−5 (1 in 100,000; ICRP, 1991). Although posing a low risk health hazard, periodic monitoring of natural radioactivity in foodstuff remains important in seeking to ensure the radiological safety of the public.

Usage hydraulic press to separate sap from Eucheuma cottonii

Function of hydraulic press in fresh handling of seaweed is to separate sap from its thallus tofasten its drying process. A device model of hydraulic press has been developed at the ResearchCenter for Marine and Fisheries Product Processing and Biotechnology with a pressure energy(force power) of 30 tons at 4 kWh. During the use of force power of 10 tons/900 cm2for 10 minutesfor 10 kg of seaweed, 20.6% of sap was obtained. Sap is known to contain 2,000 ppm of auxin,1,500 ppm of giberelin (GA3), 1,200 ppm of zeatin and 1,000 ppm of kinetine. In horticulture, ithas been applied to promote growth rate in plants and to increase the production of fruits.

Integrated seaweed cultivation on an abalone farm in South Africa

Land-based abalone aquaculture in South Africa, based on the local species Haliotis midae, started in the early 1990s and has grown rapidly in the last decade, with 13 commercial farms now producing over 850 t per annum. Over 6,000 t per annum of kelp Ecklonia maxima are now harvested for this purpose, and some kelp beds are reaching maximum sustainable limits. Research into seaweed aquaculture as feed (Ulva and some Gracilaria) for abalone started in the late 1990s on the southeast coast (where there are no kelp beds) using abalone waste water. A growing body of evidence suggests that a mixed diet of kelp plus other seaweeds can give growth rates at least as good as compound feed, and can improve abalone quality and reduce parasite loads. A pilot scale Ulva lactuca and abalone integrated recirculation unit using 25% recirculation was designed and built on the south west coast of South Africa using one 12,000-L abalone tank containing 13,200 15 ± 2.5 g abalone, connected to two 3,000-L seaweed tanks containing an initial starting biomass of 10 kg of seaweed, replicated 3 times. In an 18-month period, there were no significant differences in abalone health or growth rates, sediment build up and composition, mobile macro fauna densities and species between the recirculation or the flow-through units. Transfer of oxygen generated by the seaweeds to the abalone tanks was poor, resulting in the recirculated abalone tanks having lower (33%) dissolved oxygen concentrations than a comparable flow-through abalone unit. Seaweed nutrient content and specific growth rates in the units were comparable to seaweeds cultivated in fertilized effluent (SGR = 3.2 ± 3.4%.day−1; Yield = 0.2 ± 0.19 kg.m2.day−1). Indications were that at this low recirculation ratio the seaweeds in the units were nutrient limited and that there were no negative effects to the abalone being cultivated in such a recirculation unit at this recirculation ratio.

Quantification of Coastal New Ultra-Fine Particles Formation from In situ and Chamber Measurements during the BIOFLUX Campaign

Environmental Context.Secondary processes leading to the production of ultra-fine particles by nucleation are still poorly understood. A fraction of new particles formed can grow into radiatively active sizes, where they can directly scatter incoming solar radiation and, if partly water soluble, contribute to the cloud condensation nuclei population. New particle formation events have been frequently observed at the Mace Head Atmospheric Research Station (western Ireland), under low tide and sunny conditions, leading to the hypothesis that new particles are formed from iodo-species emitted from macroalgae. Abstract.New particle formation processes were studied during the BIOFLUX campaign in September 2003 and June 2004. The goals were to bring new information on the role of I2 in new particle formation from seaweeds and to quantify the amount of I2 emitted and new particles formed by a given amount of seaweed. These two goals were achieved by using a simulation chamber filled with selected species of seaweeds from the Mace Head area and flushed with particle-free atmospheric air. It was found that total particle concentrations and particles in the 3–3.4 nm size range produced in the chamber are positively correlated with gaseous I2 concentrations emitted by the seaweeds, with a typical source rate of 2800 particles cm−3 ppt(I2)−1 in the 3–3.4 nm size range. In fact, I2 and particle concentrations are also both directly positively correlated with the seaweed mass (64 300 particles cm−3 formed per kg of seaweed, and 24 ppt of I2 per kg of seaweeds) until saturation was reached for a seaweed biomass of 7.5 kg m−2. From the chamber experiments, the flux of 3–3.4 nm particles was calculated to be 2.5 × 1010 m−2 s−1 for a seaweed loading of 2.5 kg m−2 (representative of a typical seaweed field density), decreasing to 1 × 1010 m−2 s−1 for a seaweed loading of 1 kg m−2. At a seaweed loading of 2.5 kg m−2, the growth rate of particles produced in the chamber was calculated to be 1.2 nm min−1. The source rates and growth rates determined from the chamber experiments were used in conjunction with seaweed coverage in and around Mace Head to produce local emission inventories for a meso-scale dispersion model. Comparison of the resulting aerosol size distributions from the model simulations and those observed exhibited good agreement suggesting that the chamber fluxes and growth rates are consistent with those associated with the tidal emission areas in and around Mace Head.

A proposed model for “environmentally clean” land-based culture of fish, bivalves and seaweeds

A model system is proposed, in which particulate and dissolved metabolites from the effluents of fish culture are removed by biofilters of bivalves ( Crassostrea gigas and/or Tapes semidecussatus) and seaweeds ( Ulva lactuca). The design utilizes ecological principles and the results of long-term pilot-scale trials with each of the four components of the system. Fresh sea water enters the fishponds, drains through an earthen sedimentation pond, a bivalve filtration unit and a seaweed filtration/production unit, and is finally discharged back into the sea. An additional loop recirculates water from the sedimentation pond through a bivalve production unit. The performance of each of the different components of the system is assessed in terms of total nitrogen budgets, which yield the following results: fish yield, 26% of the N introduced in the feed; bivalve yield, 14.5%; seaweed yield, 22.4%; settled feces, 32.8%; suspended and dissolved discharge back into the sea, only 4.25%. The harvested yields contain 63% of the N budget. The production of 1 kg of fish, requiring 3 kg of feed, is accompanied by the production of 3 kg of bivalves and 7.8 kg of seaweed. Each 100 m 2 of fishponds requires 50 m 2 of sedimentation ponds, 33 m 3 of bivalve troughs and 42 m 2 of seaweed ponds.