Day 1 :
- Aquaculture and Fisheries
Session Introduction
Nguyen Phuoc Vinh
National Taiwan Ocean University, Keelung 20224, Taiwan, R.O.C
Title: Bioeconomic analyses for Brine shrimp Artemia franciscana commercial culture in coastal salt fields in the Mekong Delta, Vietnam
Biography:
Nguyen Phuoc Vinh completed his master from Gent University, Belgium and has been doing PhD at National Taiwan Ocean University, Taiwan. He is working as a governmental researcher of Science and Technology Department in the Mekong Delta, Vietnam. Beside majoring in Artemia culture in Vietnam and Belgium, he also had practical experiences in a economic analysis, molecular technique and aquaculture breeding in Taiwan and Philippines.
Abstract:
Culturing Artemia in the Mekong Delta is becoming more and more important to satisfy the live feed demand of aquaculture and this has been recently facing some environmental and technical challenges. This study presents a cost and return analysis by considering the differences in Artemia farming between two geographic locations in coastal areas of the Mekong Delta. The key factors affecting the potential production and profitability were determined according to multivariate statistical analysis and economic principles. The results emphasized that profitability performances among Artemia farms vary considerably according to geographic areas, with higher profitabilities (average benefit cost ratio: 2.68) achieved by farms in location 1 (Vinh Chau) compared to those in location 2 (Bac Lieu) (p<0.01). For Artemia cyst production improvement, beside maintaining optimal stocking densities of dried cysts from 1.06 to 1.17 kg/ha, moderate increases of organic fertilizer, feed and chemical inputs are recommended to supply Artemia with more nutrients and create better water environment for the optimal development and reproduction of Artemia. Additionally, a periodic harvest of Artemia biomass is required to minimize food and space competition and provide more incomes to farmers. In terms of supportive strategies, the government in Bac Lieu is proposed to have more investment policies for farm land and strengthen the establishments and activities of local cooperatives for further technical and financial assistance in Artemia culture. For sustainable development, scientists are advised to have a good collaboration with processing companies to commercially produce specific formulated feeds in a way that could satisfy nutritional requirements of Artemia, minimize environmental impact and improve profitability for coastal communities.
Yasuo UTSUMI
National Institute of Technology, Sendai College, JAPAN
Title: The Visualization of the Tacit Knowledge of the Fisherperson to Achieve the Sustainable Coast Fishery in Japan
Biography:
Yasuo UTSUMI has completed his Dr of Engineering from Tohoku University in 1984 and is the president of Maizuru College since 2018. He is responsible for the research and the collaboration among local bodies, academic organizations and NPO in terms innovation toward the smart community, the education of engineers including project management and intellectual propertiies. He is the project leader of SCOPE ‘Research and development of efficiency of fishery utilizing local ocean data’, 2017-2019, driven by MIC, Japan, and is the member of ISO TC163/ SC1 (Thermal performance and energy use in the built environment/Test and measurement methods) .
Abstract:
The fish catches have been decreasing and the average age of fisherpersons has increasing in recent years in Japan. It is urgent issue for the sustainable fishery to clarify the conventional expertise and to transform it into the formal knowledge. This research is aimed to visualize the expertise of the coast fishery in Higashi-matsushima, Japan. Three steps are applied based on SCOPE project by Ministry of Internal Affairs and Communications, MIC, Japan. 1) To exploit tacit knowledge: Interviews to fisherpersons, researchers, concerned organization, etc. are executed to acquire the procedures of coast fishery including the related data (open and/or personal), etc., 2) To survey the public data: The literature review and data survey are done to make the list of the available data, and 3) To transform the tacit knowledge to the formal knowledge: Constructing the framework of the all knowledge according to the coast fishery. Results are; 1) The list of available data is completed. Most of the data is on the web and the time interval is one hour or more. The local data, e.g. within several km2 is rare, 2) For the set net fishery and the gill net fishery, the assessment of the most promising net position is based on the location of ‘Shiome’ that is the boundary of the different mass water that gives the stress to fishes because of the temperature difference, etc., and 3) As the future work, the detection of the location ‘Shiome’ is necessary to achieve more efficient fishery operation
KESHIA GOVENDER
South African Association for Marine Biological Research, uShaka Sea World, South Africa
Title: The efficacy of various filter media in removing copper from treated seawater.
Biography:
Keshia Govender, 33 years old, Btech Biotechnology, 8 years in water quality (chemistry and microbiology).
Abstract:
Antiparasitic copper treatment is an integral part of routine marine aquaria quarantine, and, at times is even used to treat fish on exhibits. Free copper will react with calcareous materials (e.g. coral, rock or limestone), to form insoluble copper carbonate. This will leach out into fresh, untreated saltwater once a bath treatment is completed. As copper is extremely toxic to invertebrates, any residual copper can cause unexpected mortality.
This project investigated and compared the efficacy of various filter systems in removing residual copper in saltwater. The four filter media examined were activated carbon, zeolite, poly-filters and powdered banana peels.
The experiment was undertaken using five glass tanks each having seawater, airlines, copper lines and canister filters. The first tank was used as a control. There were three phases to the experiment. The copper tests, temperature and pH were taken through all three phases.
My results showered that zeolite together with powdered banana were the most successful in absorbing the most amount of free copper. The pH within this time frame was 7.8-8 and temperatures were relatively stable. After two months the zeolite became deactivated and activated carbon achieved good absorption of free copper. Powdered banana showed immense absorption however the pH levels would drop on certain days. The Poly-filter showed very slow absorption during the entire experiment through all three phases.
In conclusion activated carbon was the best filter media although taking a long period of time to absorb the free copper. Some results were zero or extremely low levels of free copper detected. Powdered banana was the second filter media that absorbed the most amount of free copper however the pH readings took time to stabilise. Environmentally these filters can be used in waste water treatment plants to remove heavy metals such as copper either by having canister were the media is added in or in biofilters were the various media can be added.