coastal aquaculture
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2022 ◽  
Vol 6 ◽  
Author(s):  
Ponlakrit Sangaewut

The objectives of this research were: 1) to study the management of coastal aquaculture at the Coastal Aquaculture Research and Development Center, Region 3, Surat Thani Province; 2) study problems and obstacles in aquaculture management. 3) Guidelines for the development of aquaculture management. This research used both qualitative and quantitative methods simultaneously. The sample consisted of 60 people, and a categorical randomisation method was used. The qualitative method used a focus group and selected five key informants specifically. The research instruments used include questionnaires and semi-structured interviews. The Quantitative data analysis used statistics such as; mean, percentage and standard deviation. The results showed that the overall opinion on the management of coastal aquaculture Research and Development Center, Region 3 (Surat Thani) was at a high level with a mean of 4.03. The qualitative research method used in-depth interviews with the sample groups; it was found that coastal aquaculture management can be of two types: 1) The government sector co-ordinates with some agencies and organizations to seek the people’s opinions in unity, which shows a direct collaboration with the government, hence opening room for mutual understanding. Both in terms of giving information, problem-solving, expression of opinion, and joint decision.


2021 ◽  
Vol 12 (1) ◽  
pp. 398
Author(s):  
Luís Resende ◽  
Juan Flores ◽  
Cláudia Moreira ◽  
Diana Pacheco ◽  
Alexandra Baeta ◽  
...  

Integrated multitrophic aquaculture (IMTA) is a versatile technology emerging as an ecological and sustainable solution for traditional monoculture aquacultures in terms of effluent treatment. Nevertheless, IMTA is still poorly applied in aquaculture industry due to, among other reasons, the lack of effective, low-investment and low-maintenance solutions. In this study, one has developed a practical and low maintenance IMTA-pilot system, settled in a semi-intensive coastal aquaculture. The optimisation and performance of the system was validated using Ulva spp., a macroalgae that naturally grows in the fishponds of the local aquaculture. Several cultivation experiments were performed at lab-scale and in the IMTA-pilot system, in static mode. The specific growth rate (SGR), yield, nutrient removal, N and C enrichment, protein and pigment content were monitored. Ulva spp. successfully thrived in effluent from the fish species sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) production tanks and significantly reduced inorganic nutrient load in the effluent, particularly, NH4+, PO43− and NO3−. The enrichment of nitrogen in Ulva spp.’s tissues indicated nitrogen assimilation by the algae, though, the cultivated Ulva spp. showed lower amounts of protein and pigments in comparison to the wild type. This study indicates that the designed IMTA-pilot system is an efficient solution for fish effluent treatment and Ulva spp., a suitable effluent remediator.


2021 ◽  
Vol 14 (1) ◽  
pp. 1 ◽  
Author(s):  
Dong Chen ◽  
Yafei Wang ◽  
Zhenyu Shen ◽  
Jinfeng Liao ◽  
Jiezhi Chen ◽  
...  

Human activities along with climate change have unsustainably changed the land use in coastal zones. This has increased demands and challenges in mapping and change detection of coastal zone land use over long-term periods. Taking the Bohai rim coastal area of China as an example, in this study we proposed a method for the long time-series mapping and change detection of coastal zone land use based on Google Earth Engine (GEE) and multi-source data fusion. To fully consider the characteristics of the coastal zone, we established a land-use function classification system, consisting of cropland, coastal aquaculture ponds (saltern), urban land, rural settlement, other construction lands, forest, grassland, seawater, inland fresh-waters, tidal flats, and unused land. We then applied the random forest algorithm, the optimal classification method using spatial morphology and temporal change logic to map the long-term annual time series and detect changes in the Bohai rim coastal area from 1987 to 2020. Validation shows an overall acceptable average accuracy of 82.30% (76.70–85.60%). Results show that cropland in this region decreased sharply from 1987 (53.97%) to 2020 (37.41%). The lost cropland was mainly transformed into rural settlements, cities, and construction land (port infrastructure). We observed a continuous increase in the reclamation with a stable increase at the beginning followed by a rapid increase from 2003 and a stable intermediate level increase from 2013. We also observed a significant increase in coastal aquaculture ponds (saltern) starting from 1995. Through this case study, we demonstrated the strength of the proposed methods for long time-series mapping and change detection for coastal zones, and these methods support the sustainable monitoring and management of the coastal zone.


2021 ◽  
Vol 5 ◽  
Author(s):  
Abdullah-Al Mamun ◽  
Francis J. Murray ◽  
Matthew Sprague ◽  
Bruce J. McAdam ◽  
Nanna Roos ◽  
...  

Export-orientated shrimp and prawn farming in coastal ghers has been associated with negative environmental, social, and nutritional impacts. This study challenges these perceptions based on field observations from four communities in South West Bangladesh. Most households observed (>60%) were either directly involved in seafood farming or engaged elsewhere in the seafood value chain. Our study set out to establish how the type and location of aquaculture impacted on access to and consumption of aquatic animals. Additionally, we assessed the effects of both household socioeconomic status and intra-household food allocation on individual diet and nutritional outcomes. We used a blended approach, including a 24-h consumption recall on two occasions, analysis of the proximate composition of aquatic animals and biomarkers from whole blood from a sample of the target population. The diverse polyculture systems generated broad social benefits, where “export-oriented” production actually supplied more food locally than to global markets. Key findings: (1) worse-off households achieved higher productivity of farmed aquatic animals on smaller landholding than better-off households with larger landholdings; (2) vegetable production on gher dikes was a significant source of nutrition and income in lower saline gradients; (3) more fish was eaten in lower saline gradients although fish consumption was highly variable within and between households; (4) intra-household allocation of specific foods within diets were similar across communities; (5) recommended nutrient intakes of protein and zinc exceeded daily requirements for adolescent females, but energy, calcium, and iron were below recommended intake levels; (6) n-3 LC-PUFA, expressed as percentage of total fatty acids, in whole blood samples of adolescent females declined with ambient salinity level regardless of household socioeconomic status; (7) analysis of aquatic animals consumed found that mangrove species and tilapia harvested from higher saline ghers contained high levels of desirable PUFAs. These findings suggest that export-driven, extensive coastal aquaculture can be nutrition sensitive when co-products are retained for local consumption.


2021 ◽  
Vol 919 (1) ◽  
pp. 012045
Author(s):  
D A Oktavia ◽  
D L Ayudiarti ◽  
D Febrianti ◽  
V Yanuar

Abstract RICA (Research Institute for Coastal Aquaculture) Maros in South Sulawesi has developed 5 probiotic preparations, namely RICA-1, RICA-2, Rica-3, RICA-4 and RICA-5 in liquid form to improve shrimp farming in ponds. In practice, the use of liquid probiotics has been very optimal but the distribution is constrained because of its liquid form. For this reason, microencapsulation of liquid probiotics is carried out to protect from the external environment and maintain the viability of probiotic cells in the encapsulated matrix. The purpose of this study was to determine the physical properties of probiotic effervescent tablets using tapioca coating with different concentration variants (10 and 20%) with four effervescent tablet formulas. The results showed that the pH of the probiotic effervescent tablet Formula 3 with a coating concentration of 10% tapioca had a neutral pH compared to all existing formulas. However, the pH for probiotic effervescent tablets produced by all formulas can still be applied to shrimp ponds. Formula 4 with 10% tapioca coating has a mean weight and hardness that is close to the standard as well as a disintegration time that meets the specified standard of tablet physical properties. Meanwhile, the tablet friability value was met by Formula 3 with a concentration of 10% tapioca coating. It can be concluded that the best formula that meets the standard physical properties of tablets is Formula 4 with 10% tapioca coating. The probiotic effervescent tablet with tapioca coating has a weakness in the hardness value which causes the average weight to be not uniform. These results indicate that tapioca coating is not suitable for use as a coating for probiotic effervescent tablets.


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