Predation mortality of bay anchovy Anchoa mitchilli eggs and larvae due to scyphomedusae and ctenophores in Chesapeake Bay

  • Purcell J
  • Nemazie D
  • Dorsey S
 et al. 
  • 40

    Readers

    Mendeley users who have this article in their library.
  • 122

    Citations

    Citations of this article.

Abstract

We measured predation on bay anchovy Anchoa mitchilli eggs and larvae by abundant scyphomedusae Chrysaora quinquecirrha and ctenophores Mnemiopsis leidyi from gut contents, digestion rates, and densities of predators and prey during 9 d in July 1991 at 4 stations in Chesapeake Bay, USA, These predation rates were compared to egg and larval mortality rates measured concurrently in ichthyoplankton surveys. Daily predation by medusae and ctenophores was 19 13% (mean SD) of the eggs over the 20 h stage duration, with medusae responsible for 26 to 100% of the predation. These gelatinous predators accounted for 21 17% of the total estimated daily egg-stage mortality. On average, medusae consumed 29 14% d(-1) of the larval hay anchovy, which was 41 35% of total estimated larval mortality. Predation on larvae by ctenophores was not detected. These predation effects are compared with those measured concurrently in free-drifting 3.2 m(3) mesocosms. We conclude that medusae, which had high feeding rates but low abundances, and ctenophores, which had low feeding rates but high abundances, were important predators of bay anchovy eggs and larvae in the mesohaline region of Chesapeake Bay.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • J. E. Purcell

  • D. A. Nemazie

  • S. E. Dorsey

  • E. D. Houde

  • J. C. Gamble

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free