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Estuaries and Coasts

, Volume 42, Issue 1, pp 274–291 | Cite as

Density, Growth, Production, and Feeding Dynamics of Juvenile Weakfish (Cynoscion regalis) in Delaware Bay and Salt Marsh Tributaries: Spatiotemporal Comparison of Nursery Habitat Quality

  • Brian P. Boutin
  • Timothy E. Targett
Article

Abstract

Biomass, growth, production, and feeding of young-of-the-year weakfish were examined in salt marsh tributary and nearshore habitats of Delaware Bay to describe the dynamic nursery habitat function for this species. Weakfish were collected from June through October 2005–2007 at seven sites in Delaware Bay, each with one nearshore bay station and three stations in an adjacent tributary. Weakfish biomass was consistently highest in the mid-bay, with a shifting peak down-bay in the late stages of the nursery period. Specific growth rates (SGR) ranged from − 2.98 to 9.57% mass day−1 and exhibited a seasonal bimodal pattern of the highest growth in early and late summer. This pattern coincided with that of biomass, suggesting an absence of density-dependent effects on growth. SGR declined in mid-summer and appeared to be associated with reduced stomach fullness. Growth was highest at sites in the mid- and lower bay, and lowest in the upper bay. Variation in instantaneous production primarily reflected trends in biomass, although low growth in August exacerbated a mid-summer production decline. Stomach fullness also declined in mid-summer, suggesting low resource availability. In most cases, fish at sites with high biomass, growth, and production had a higher proportion of mysids in the diet. Both tributary and nearshore areas adjacent to large expanses of salt marsh with abundant mysid resources served as the most important nurseries for juvenile weakfish, though importance of each habitat was temporally dynamic. This study presents a novel approach to quantifying dynamic nursery habitat quality for estuary-dependent fishes during their nursery period.

Keywords

Weakfish Nursery habitat Feeding Growth Production 

Notes

Acknowledgements

We thank K. Stierhoff, B. Ciotti, M. Rhode, T. Unger, C. House, S. Baker, and E. Hale who helped in the field and laboratory. We also thank B. Scarborough and M. Mensinger at the Delaware National Estuarine Research Reserve for extensive conceptual and physical support of this research. We thank P. Gaffney and D. Miller for suggestions on statistical analyses and M. Fields for the assistance with Fig. 1. Helpful comments from two anonymous reviewers improved this paper. Funding was provided by the National Oceanic and Atmospheric Administration, Office of Ocean and Coastal Resource Management, Estuarine Reserves Division, through the National Estuarine Research Reserve Graduate Research Fellowship Program to B. Boutin.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

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ESM 1 (DOCX 16 kb)

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Copyright information

© Coastal and Estuarine Research Federation 2018

Authors and Affiliations

  1. 1.College of Earth, Ocean and Environment, School of Marine Science and PolicyUniversity of DelawareLewesUSA
  2. 2.The Nature ConservancyKill Devil HillsUSA

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