Expanded shellfish mariculture is an important strategy to improve global food security. However, greenhouse gas (GHG) emissions associated with mariculture are a concern when evaluating the benefits of protein production. In this study, we conducted two field campaigns in a constricted tagelus (Sinonovacula constricta) farming system (March 3–5 and April 21–23, 2021) to observe the changes in GHGs. In a routine cycle of water exchange, the CO₂ fluxes varied and followed a diurnal pattern (−7.6 to 23.1 mmol/m²/d), which is related to changes in the concentrations of dissolved inorganic carbon (DIC) and total alkalinity (TA). Non-CO₂ GHGs were significantly released (CH₄: 0.1–1.0 mmol/m²/d; N₂O: ~0.1 mmol/m²/d) during the farming period and were responsible for over 75% of the net global warming potential over a centurial period. We argue that the significant GHG emissions in the constricted tagelus farming system were mainly attributed to the farming mode, which loads many nutrients to make algae blooms for tagelus feeding and disturbs the sediment surface by water draining/bivalve activity, increasing the possibility of GHG production and emissions. We suggest improving the monoculture mode and tempering the adoption of water drainage to ameliorate the current situation. We recommend that further research in mariculture consider non-CO₂ GHGs, including CH₄ and N₂O, to evaluate the potential of GHG emissions and their local importance.

扩大贝类海水养殖是改善全球粮食安全的重要战略。然而，在评估蛋白质生产的益处时，与海水养殖相关的温室气体 (GHG) 排放是一个问题。在这项研究中，我们在一个狭窄的黄花 ( Sinonovacula constricta ) 农业系统（2021 年 3 月 3 日至 5 日和 4 月 21 日至 23 日）中进行了两次田间活动，以观察温室气体的变化。在水交换的常规循环中，CO ₂通量变化并遵循昼夜模式（-7.6 至 23.1 mmol/m ² /d），这与溶解无机碳（DIC）浓度和总碱度的变化有关（ TA）。非CO ₂温室气体显着释放（CH ₄：0.1-1.0 mmol/m ²/d; N ₂ O：~0.1 mmol/m ² /d) 在农业时期，在一个世纪期间造成了超过 75% 的净全球变暖潜能值。我们认为，狭窄的挂绳养殖系统中的大量温室气体排放主要归因于养殖模式，该方式加载了许多营养物质，使藻类大量繁殖以供挂绳觅食，并通过排水/双壳类活动扰乱沉积物表面，增加了温室气体产生的可能性和排放。建议改进单一栽培模式，缓和排水采用，以改善现状。我们建议海水养殖的进一步研究考虑非 CO ₂温室气体，包括 CH ₄和 N ₂O，评估温室气体排放的潜力及其在当地的重要性。