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Temperature-Dependent Growth of Brook TroutThe growth of brook trout is closely influenced by water temperature. Experimental data demonstrate how trout weight changes over a 24-day period in response to varying water temperatures. At lower temperatures, such as 15.5 degrees Celsius, brook trout show significant weight gain. However, as the temperature increases, the amount of weight gained steadily decreases. At the highest temperature measured, 24.4 degrees Celsius, trout experience a net...
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Area of Science:

  • Marine Biology
  • Climate Change Science
  • Fisheries Science

Background:

  • Ocean warming, temperature variability, and marine heatwaves present significant threats to marine ecosystems.
  • Quantifying the impacts of these climate-related stressors on fish populations is crucial for effective management.

Purpose of the Study:

  • To quantify and isolate the individual effects of long-term ocean warming, interannual temperature variability, and marine heatwaves on fish biomass.
  • To analyze the differential impacts on fish populations at the warm and cold edges of their geographic ranges.

Main Methods:

  • Analysis of 702,037 biomass change estimates from 33,990 fish populations (1,566 species) between 1993 and 2021.
  • Focus on major Northern Hemisphere basins to assess climate change impacts on marine species.

Main Results:

  • Long-term ocean warming correlated with annual fish biomass declines up to 19.8%.
  • Marine heatwaves and warmer years induced sharp biomass losses (up to 43.4%) at warm range edges and significant gains (up to 176%) at cold range edges.
  • Identified 'winners and losers' in fish populations due to varying responses to short- and long-term warming.

Conclusions:

  • Edge-dependent responses to warming ('winners and losers') must be considered in fisheries management to prevent overexploitation of temporary biomass increases.
  • Future fisheries management strategies must account for projected fish biomass loss due to ongoing ocean warming.