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[Onset] Dissolved Oxygen Monitoring for Aquaculture Research

Posted on1 Month ago by
Challenge: The Aquatic Ecosystem Lab (AElab) at National Chung Hsing University (NCHU) in Taiwan faced the task of devising a measurement methodology for the carbon budget in aquaculture fishpond systems. Critical parameters, such as respiration, production, and dissolved oxygen (DO) levels in the water, needed measurement. The AElab team initially relied on time-consuming manual water sample collection and DO level recording, recognizing its limitations due to resource constraints and infrequent measurements, leading to deviations from actual field conditions. This prompted the team to search for a more efficient and accurate solution.

Solution: In light of its ability to offer continuous DO and temperature measurements over an extended period, the AElab team opted for Onset’s HOBO Dissolved Oxygen Data Logger. This affordable, high-performing logger with 0.2 mg/L accuracy, an optical USB interface for high-speed data offload, and a user-replaceable DO sensor cap proved ideal. Additionally, AElab chose HOBOware Pro software for configuring loggers, initiating data collection, and downloading data. PVC pipes were installed in the soil of each fishpond at the test site, and HOBO DO loggers were secured with floats, allowing them to float while staying in place. Weekly data retrieval, combined with meteorological data and on-site water salinity measurements, facilitated comprehensive analysis.

Results: Continuous monitoring of DO concentrations, with measurements every 30 minutes, and weekly data downloads empower the AElab team to calculate respiration and production parameters, essential for a more comprehensive carbon balance model. Following Odum's (1956) oxygen metabolism model, the team calculates gross primary production (GPP), ecosystem respiration (ER), and the net ecosystem metabolism (NEM) value of aquaculture pond water. This is crucial for assessing carbon input and output in aquaculture ponds, especially concerning the goal of achieving net-zero emissions by 2050.

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