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- W3015559127 abstract "Abstract With the ever increasing demand for food, global aquaculture practices have intensified enormously over the last years. Due to this intensification, (inadequate) management strategies can cause (chronic) stress in cultured fish, hereby affecting fish performance and welfare. In Southeast Asia milkfish (Chanos chanos) is an important aquaculture species. Traditionally, milkfish are cultured in pond systems with extensive culture practices, however, as culture practices intensified, other systems such as marine cages were introduced. Here we aimed to identify potential environmental and/or commercial management related chronic stressors for milkfish kept in marine cage systems using ontogenetic (OG) scale cortisol. We quantified OG scale cortisol as indicator for chronic stress levels in juvenile milkfish (average TL between 20 and 30 cm) from four cage systems (F1-F4; culture time: 2.5–3 months) with different geographic locations and management strategies within the mariculture area (approx. 2.2 × 0.6 km) of the Guiguiwanen Channel in Bolinao (Philippines). The sites were chosen along the mariculture area, with F1 located in the mouth of the channel, F2 at the beginning, F3 mid-way, and F4 at the end of the mariculture area. Each site was sampled twice (I, II) with a time interval of 15 days between both samplings. OG scale cortisol increased significantly between sampling I and II at all four sites, indicating that milkfish at all sites experienced to a certain extent stressful conditions within their cage system. At both samplings OG scale cortisol was highest at F4, where also the highest stocking density was observed. Taking into account the existing culture conditions, OG scale cortisol levels showed that different aspects of typically applied management strategies (e.g. stocking density, feeding strategy) as well as the location might have an effect on the stress level of cultured milkfish and therefore should be considered as potentially severe stressors in milkfish mariculture. To our knowledge this is the first study quantifying OG scale cortisol as indicator for chronic stress in commercial milkfish aquaculture settings, hereby contributing to overall more sustainable aquaculture practices." @default.
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- W3015559127 date "2020-09-01" @default.
- W3015559127 modified "2023-09-29" @default.
- W3015559127 title "Chronic stress under commercial aquaculture conditions: Scale cortisol to identify and quantify potential stressors in milkfish (Chanos chanos) mariculture" @default.
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- W3015559127 doi "https://doi.org/10.1016/j.aquaculture.2020.735352" @default.
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