DOI: 10.1016/j.aquaculture.2019.734874
论文题名: The impacts of increasing temperature and moderate hypoxia on the production characteristics, cardiac morphology and haematology of Atlantic Salmon (Salmo salar)
作者: Gamperl A.K. ; Ajiboye O.O. ; Zanuzzo F.S. ; Sandrelli R.M. ; Peroni E.D.F.C. ; Beemelmanns A.
刊名: Aquaculture
ISSN: 448486
出版年: 2020
卷: 519 语种: 英语
英文关键词: Feed conversion
; Global warming
; Growth performance
; Heart
; Upper thermal tolerance
Scopus关键词: aquaculture
; aquaculture industry
; carrying capacity
; high temperature
; hypoxia
; salmonid
; salmonid culture
; seawater
; survival
; temperature effect
; Atlantic Coast [Canada]
; Atlantic Coast [North America]
; Canada
; Saint John River
; Salmo salar
英文摘要: Given the predicted effects of climate change on seawater temperatures and water oxygen levels (i.e., the frequency and severity of hypoxia), it is important to understand the impact of these two environmental challenges on salmon used in the Atlantic Canada aquaculture industry (i.e., of Saint John River origin). Thus, we exposed salmon to: 1) control conditions (12 °C, 100% air sat.); 2) an incremental temperature increase (1 °C per week from 12 °C to 20 °C) and then held the fish at 20 °C for an additional 3 weeks (Experiment #1); and 3) an incremental increase in temperature until mortalities reached ~ 30% (Experiment #2). Further, we conducted the two temperature challenges under both normoxic and moderately hypoxic (~ 70% air sat.) conditions. Our experiments show that these salmon can be held at temperatures up to 20 °C, and 20 °C plus moderate hypoxia, for periods of up to a month without any mortalities. However, exposure to the incremental temperature regime resulted in a ~ 10% increase in feed conversion ratio, and the addition of hypoxia decreased feed intake, and thus, growth (15–20% depending on metric). In Experiment #2, specific growth rate and feed intake dropped dramatically after 19 - 20 °C, and mortalities were ~ 15% at 22 °C and ~ 30% by 23 °C. Interestingly, hypoxia did not affect survival at these temperatures, and high temperature + hypoxia enhanced blood oxygen carrying capacity (by 15%) whereas high temperature alone increased relative ventricular mass (by 21%). This research suggests that further increases (i.e., beyond 18 - 20 °C) in coastal temperatures in Atlantic Canada may negatively impact salmon production, especially if combined with hypoxia. In addition, it highlights the need for a better understanding of how these two environmental stressors interact to affect salmon biology/physiology (especially as increases in sea-cage water temperatures are incremental world-wide, and poorly investigated). © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158635
Appears in Collections: 气候变化与战略
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作者单位: Department of Ocean Sciences, Memorial University, St. John's, NL A1C 5S7, Canada
Recommended Citation:
Gamperl A.K.,Ajiboye O.O.,Zanuzzo F.S.,et al. The impacts of increasing temperature and moderate hypoxia on the production characteristics, cardiac morphology and haematology of Atlantic Salmon (Salmo salar)[J]. Aquaculture,2020-01-01,519