http://scholars.ntou.edu.tw/handle/123456789/5 2026-04-25T03:59:57Z 2026-04-25T03:59:57Z Liao, Chun-Pei Chu, Yu-Ting Hu, Yeh-Fang Lee, Meng-Chou Nan, Fan-Hua Lu, Yu-Heng http://scholars.ntou.edu.tw/handle/123456789/26546 2026-03-16T07:34:57Z 2025-01-01T00:00:00Z

標題: From feeding to flourishing: Aquaponics strategies and their impact on Taiwan 作者: Liao, Chun-Pei; Chu, Yu-Ting; Hu, Yeh-Fang; Lee, Meng-Chou; Nan, Fan-Hua; Lu, Yu-Heng 摘要: Over the past twenty years, global research on aquaponics has shown steady growth, particularly in areas such as system performance optimization, wastewater treatment, nutrient balance, and the efficiency of plant and animal production. In Taiwan, about 80 commercial-scale aquaponics producers are operating, with the top 20% occupying most of the production area. Recent trends over the past decade reveal four key inferences: (1) A decline in annual aquaponics research output in Taiwan; (2) An increase and diversification of aquaponics farms, with rapid growth among system vendors, though stable, large-scale commercial operations are still lacking; (3) Ongoing challenges like poor summer crop growth and increased winter market competition; and (4) Broad agreement on the social value of aquaponics, despite lagging administrative support. The aquaponics industry in Taiwan, despite varying system designs, emphasizes sustainable practices and their benefits to environmental and social well-being. Strong community support persists, yet challenges like extreme temperatures, winter competition, administrative hurdles, and difficulties in leasing land and obtaining licenses remain. As aquaponics contributes to both food production and community nourishment, diversified models are essential for food security. To ensure sustainable growth, enhanced administrative support and better understanding of consumer preferences and industry dynamics are crucial.

2025-01-01T00:00:00Z Chen, Yi-Jung Chou, Wen-Chen Tseng, Hsiao-Chun Shiu, Ruei-Feng Lee, Meng-Chou Nan, Fan-Hua Yeh, Han-Yang http://scholars.ntou.edu.tw/handle/123456789/26545 2026-03-16T08:29:24Z 2025-01-01T00:00:00Z

標題: Biogenic CO₂, CH₄, and N₂O emissions from abalone culture in tidal ponds 作者: Chen, Yi-Jung; Chou, Wen-Chen; Tseng, Hsiao-Chun; Shiu, Ruei-Feng; Lee, Meng-Chou; Nan, Fan-Hua; Yeh, Han-Yang 摘要: Abalone is among the most highly prized seafoods, valued for its delicate flavor and texture. As abalone aquaculture continues to expand, addressing its environmental impacts has become increasingly important. Although aquaculture is recognized as a contributor to greenhouse gas (GHG) emissions, the specific mechanisms and pathways of GHG emissions-particularly in abalone farming-remain poorly understood. To clarify the patterns and drivers of GHG emissions in abalone (Haliotis discus) culture systems, this study was conducted in three aquaculture ponds located in Gongliao District, New Taipei City, Taiwan. We measured CO2, CH4, and N2O fluxes along with key environmental parameters to assess variation across sampling locations, times, and seasons. The results showed that sampling time had no significant effect on GHG flux variations, whereas seasonal changes influenced all three gases, and sampling location significantly affected N2O flux only. During the culture period, average fluxes were 2.19 +/- 10.83 mmol m-2 day-1 for CO2, 2.11 +/- 2.81 mu mol m-2 day-1 for CH4, and 1.65 +/- 2.73 mu mol m-2 day-1 for N2O, indicating that the abalone ponds served as net sources of these GHGs. When converted to CO2-equivalents (CO2-eq), the total average CO2-eq flux from the ponds was 0.02 +/- 0.09 mg CO2-eq m-2 day-1, calculated using global warming potential (GWP20 and GWP100) metrics. This study provides the first comprehensive assessment of GHG emissions in abalone pond systems and offers valuable insights into their emission dynamics. The findings contribute to the scientific basis needed to improve aquaculture GHG inventories.

2025-01-01T00:00:00Z Wu, Yan-Lun Liang, Ting-Yu Hsu, Wei-Pin Shimada, Teruhisa Wirasatriya, Anindya Wetchayont, Parichat Qiu, Chunhua Lan, Kuo-Wei http://scholars.ntou.edu.tw/handle/123456789/26538 2026-03-12T03:49:06Z 2026-01-01T00:00:00Z

標題: Projected impacts of climate change on the spatial distribution and habitat preference of tropical tuna in the Pacific Ocean 作者: Wu, Yan-Lun; Liang, Ting-Yu; Hsu, Wei-Pin; Shimada, Teruhisa; Wirasatriya, Anindya; Wetchayont, Parichat; Qiu, Chunhua; Lan, Kuo-Wei 摘要: Climate change is altering ocean conditions such as sea surface temperature, salinity, stratification, and dissolved oxygen, reshaping habitat suitability for yellowfin tuna (Thunnus albacares, YFT) and bigeye tuna (Thunnus obesus, BET). This study integrated Taiwanese longline catch-per-unit-effort (CPUE) data from 1981 to 2014 with environmental covariates using a Vector Autoregressive Spatio-Temporal (VAST) framework to develop Habitat Suitability Index (HSI) models. Fishing effort increased from similar to 200,000 hooks in 1991 to nearly 820,000 in 2002, before declining to similar to 400,000 by 2021. YFT dominated catches until 2000, after which BET became predominant. Spatial analyses indicated BET hotspots in the tropical central and eastern Pacific, whereas YFT were more abundant in the western Pacific with smaller hotspots in the east. Suitability curves showed BET favored cooler, moderately saline, oxygen-rich waters, while YFT preferred warmer, saltier, and slightly less oxygenated conditions. Coupling HSI models with CMIP6 projections under SSP1-2.6 and SSP5-8.5 revealed contrasting redistribution patterns: BET habitats are projected to contract and shift eastward by the end of the century, while YFT habitats are expected to expand across wider Pacific regions. These findings demonstrate that climate-driven changes in tuna distribution will likely reshape fishery productivity and management requirements. Regionspecific quota adjustments, flexible management zones, and strengthened multinational cooperation will be necessary. Incorporating the HSI outputs into quota setting and spatial planning can help sustain Taiwan's distant-water tuna fisheries in a changing climate.

2026-01-01T00:00:00Z Xu, Wen-Qi Wang, Sheng-Ping Lin, Chih-Yu Chiang, Wei-Chuan Kitakado, Toshihide http://scholars.ntou.edu.tw/handle/123456789/26534 2026-03-12T03:49:04Z 2026-01-01T00:00:00Z

標題: Spatio-temporal dynamics for dolphinfish (Coryphaena hippurus) in the waters around Taiwan: Implications for stock assessment and fisheries management 作者: Xu, Wen-Qi; Wang, Sheng-Ping; Lin, Chih-Yu; Chiang, Wei-Chuan; Kitakado, Toshihide 摘要: Understanding the spatio-temporal dynamics of dolphinfish (Coryphaena hippurus) is essential for effective stock assessment and fisheries management. Owing to its migratory nature, rapid growth, and short lifespan, the species requires management approaches that account for spatial and temporal variability. In this study, two spatio-temporal modelling frameworks, VAST and sdmTMB, were applied to longline fishery logbook data collected in the waters around Taiwan from 2011 to 2023. Standardised indices of relative abundance were estimated using an area-weighted approach that accounted for both fished and unfished regions. Cluster analysis was conducted to classify fishing strategies based on species composition, revealing a dominant dolphinfishtargeted cluster concentrated in the eastern offshore region. Both spatio-temporal models detected consistent seasonal patterns, with peak abundance in the second quarter and a decline in the third, aligning with known migratory behaviour and oceanographic influences. Spatial hotspots were identified primarily in the northeastern waters influenced by the Kuroshio Current. While general agreement was observed between the models, sdmTMB produced higher spatial contrast and slightly greater abundance estimates in the early years. Differences in model structure, spatial resolution, and data coverage were found to influence predictive outcomes. Limitations regarding logbook data quality, spatial bias, and the absence of environmental covariates were acknowledged. Nevertheless, the results demonstrate the utility of spatio-temporal modelling in deriving robust abundance indices and identifying biologically and operationally significant fishing grounds that represent key habitats and high-effort zones for dolphinfish fisheries in the northwestern Pacific. These findings provide a strong basis for integrating spatial dynamics into stock assessments and support the development of adaptive, spatially explicit management strategies in the western Pacific.

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