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<p>Capelin on the Newfoundland and Labrador shelves (Northwest Atlantic Fisheries Organization Divisions 2J3KL) collapsed in 1991 and have experienced only a modest recovery in 30 + years. Year-class strength of Newfoundland capelin is set early in its life history. Using 6&#xa0;years of larval data (2002, 2006, 2014, 2020–2022), the main objective of this study was to use trophodynamics to identify potential bottom-up drivers of capelin larval survival. The proportion of empty guts generally decreased with ontogeny; however, prey presence was low with only 18.9% of larvae containing at least one prey item in their guts. Larval diet was mainly composed of calanoid copepodites, <i>Pseudocalanus</i> spp., <i>Temora</i> spp., <i>Oithona</i> spp., and phytoplankton. There was a shift in diet with ontogeny, with copepodite stages increasing in importance with ontogeny. Although larval trophodynamics since 2002 differed from those described in the 1980s, with a higher proportion of empty guts and a broader prey spectrum, this comparison is confounded by spatial and temporal limitations of the available dataset. Using general additive models, mean recent 3-day larval otolith growth rate was related to in situ zooplankton prey availability, temperature, salinity, presence/absence of prey, and prey carbon contents. Larval growth was positively associated with copepod nauplii densities in 2 of the 3&#xa0;years, indicating that a match between larval occurrence and copepod nauplii may be an important driver of larval growth. A match-mismatch between larval occurrence and their preferred prey may be a potential bottom-up mechanism to explain the prolonged Newfoundland capelin stock recovery.</p>

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You are what you eat: is suboptimal larval diet linked to the slow recovery of the Newfoundland capelin stock?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月25日

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  • Hannah M. Murphy,
  • Samantha Trueman,
  • Gabrielle Perugini,
  • Janine O’Reilly,
  • Dominique Robert

摘要

Capelin on the Newfoundland and Labrador shelves (Northwest Atlantic Fisheries Organization Divisions 2J3KL) collapsed in 1991 and have experienced only a modest recovery in 30 + years. Year-class strength of Newfoundland capelin is set early in its life history. Using 6 years of larval data (2002, 2006, 2014, 2020–2022), the main objective of this study was to use trophodynamics to identify potential bottom-up drivers of capelin larval survival. The proportion of empty guts generally decreased with ontogeny; however, prey presence was low with only 18.9% of larvae containing at least one prey item in their guts. Larval diet was mainly composed of calanoid copepodites, Pseudocalanus spp., Temora spp., Oithona spp., and phytoplankton. There was a shift in diet with ontogeny, with copepodite stages increasing in importance with ontogeny. Although larval trophodynamics since 2002 differed from those described in the 1980s, with a higher proportion of empty guts and a broader prey spectrum, this comparison is confounded by spatial and temporal limitations of the available dataset. Using general additive models, mean recent 3-day larval otolith growth rate was related to in situ zooplankton prey availability, temperature, salinity, presence/absence of prey, and prey carbon contents. Larval growth was positively associated with copepod nauplii densities in 2 of the 3 years, indicating that a match between larval occurrence and copepod nauplii may be an important driver of larval growth. A match-mismatch between larval occurrence and their preferred prey may be a potential bottom-up mechanism to explain the prolonged Newfoundland capelin stock recovery.