Feeding, Growth, and Trophic Ecology

Link, Jason S.; Sherwood, Graham D.

doi:10.1002/9781119460701.ch6

Cited by 4 publications

(2 citation statements)

References 287 publications

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“…Regarding the impact of prey availability on the growth of Atlantic cod, it is essential to consider that Atlantic cod is an omnivorous species whose diet is mainly composed of crustaceans and teleost fish. In Flemish Cap, cod experience an ontogenically shift in diet: feeding on small crustaceans such as copepods, hyperiids, and small shrimps at small sizes (immature cods); on large crustaceans and small fish at medium sizes [small mature cod (< 85cm)]; and on shrimps, medium-sized demersal, and forage fishes when they are large [large mature cod (>85 cm)] ( Peŕez-Rodrıǵuez et al, 2016;Link and Sherwood, 2019). In this study, the abundance of Northern shrimp, Pandalus borealis, had a positive and asymptotic effect on growth (Beta=0.13, CI[0.05 -0.20]).…”

Section: Predictorsmentioning

confidence: 99%

Atlantic Cod Growth History in Flemish Cap Between 1981 and 2016: The Impact of Fishing and Climate on Growth Performance

2022

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Flemish Cap cod collapsed in the early 90’s after facing multiple threats due to climate variability and anthropogenic pressures. A master 35-year cod growth chronology was reconstructed in the present study by using sclerochronology techniques. Three additional chronologies were developed to account for the age-dependent effect of maturity and fishing intensity on growth. All chronologies showed that cod growth has decreased over the years and it is currently at the minimum level in the historic of data series. Hierarchical mixed-effects models were applied to the master chronology to identify extrinsic drivers of growth. The master chronology was divided into 3 periods: Premoratorium (1988-1998), Moratorium (1999-2009), and Postmoratorium (2010-2019). Our results showed that drivers of cod growth in the Flemish Cap varied between periods (Premoratorium: bottom temperature and fishing mortality, Moratorium: cod and pandalus abundance, and Postmoratorium: cod abundance and thickness of the cold intermediate layer). Our results suggest that density-dependence processes, food availability, and global warming may be behind the lack of recovery of the Flemish Cap cod stock. The Flemish Cap cod growth chronology shows variations on growth over time and identifies its drivers, having the potential to be included in the NAFO stock assessments or to be used to set dynamic reference points that guarantees the stock sustainability.

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Section: Predictorsmentioning

confidence: 99%

Atlantic Cod Growth History in Flemish Cap Between 1981 and 2016: The Impact of Fishing and Climate on Growth Performance

2022

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“…Meta-analysis across taxa has indicated predictable correlations between temperature and growth, ontogenic duration and mortality rates among fishes (Houde, 1989;Pepin, 1991). Link and Sherwood (2019) found positive correlations between growth (K) and temperature, and an inverse relationship between L ∞ and temperature.…”

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Temporal variability in size and growth of Atlantic herring in the Gulf of Maine

Becker

Cieri

Libby

et al. 2020

Journal of Fish Biology

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Variability in life history traits and structural diversity of commercially exploited fishes in response to stress can impact their population dynamics and sustainability. Using data from a fishery dependent sampling program from 1978 to 2011, we evaluated temporal variability of size and growth of adult Atlantic herring (Clupea harengus) in the Gulf of Maine. We then developed and tested the hypotheses on the links of such temporal changes to population density and environmental factors and found decreases in size and growth potential. Generalized additive models found that density dependence was the main driver of such changes over sea surface temperature and salinity. Our results highlight the importance of density dependent processes in regulating growth and population size structure for Atlantic herring in the Gulf of Maine. 1 | INTRODUCTION The structural diversity of life history traits (e.g., size and age) within and among fish populations is an important consideration that may impact the population dynamics and productivity of managed fish stocks (Hilborn & Walters, 1992; Ricker, 1975). Large variations in size and age diversity have been demonstrated among populations, as well as within populations among years, and can be related to various biotic and abiotic factors (e.g., population density, prey availability, temperature and salinity) (Blaxter, 1992; Chen & Mello, 1999; Hare et al., 2016; Yan et al., 2012). Additionally, truncated size and age distributions can indicate a stressed stock due to overfishing (Brunel & Piet, 2012). As such, an understanding of the complex relationship between fish populations and their environment is important for investigating the potential impact of environmental changes on fish population dynamics (Fischer et al., 2013). An inverse relationship between spawning stock biomass (SSB) and growth, as well as a decline in asymptotic length per unit biomass density, has been described (Lorenzen & Enberg, 2002; Walters & Post, 1993). The parameters of the Von Bertalanffy growth function (VBGF) maximum attainable length (L ∞), maximum attainable weight (W ∞) and the Brody growth rate (K) are influenced by density-dependent growth.

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Capelin (Mallotus villosus) availability influences the inshore summer diet of Atlantic cod (Gadus morhua) in coastal Newfoundland

Berard

Davoren

2020

Environ Biol Fish

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Feeding, Growth, and Trophic Ecology

Cited by 4 publications

References 287 publications

Atlantic Cod Growth History in Flemish Cap Between 1981 and 2016: The Impact of Fishing and Climate on Growth Performance

Atlantic Cod Growth History in Flemish Cap Between 1981 and 2016: The Impact of Fishing and Climate on Growth Performance

Temporal variability in size and growth of Atlantic herring in the Gulf of Maine

Capelin (Mallotus villosus) availability influences the inshore summer diet of Atlantic cod (Gadus morhua) in coastal Newfoundland

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