Predation of Pseudodiaptomus annandalei (Copepoda: Calanoida) by the grouper fish fry Epinephelus coioides under different hydrodynamic conditions

Environmental conditions such as illumination, hydrodynamics, and densities of organisms affect behavior of both, fish fry and their prey with impacts on trophic interactions in ecosystems and aquaculture management alike. The present study demonstrated that the copepod Pseudodiaptomus annandalei pe...

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Bibliographic Details
Published in:Journal of experimental marine biology and ecology 2010-09, Vol.393 (1), p.17-22
Main Authors: Lee, Chien-Huei, Dahms, Hans-Uwe, Cheng, Shin-Hong, Souissi, Sami, Schmitt, François G., Kumar, Ram, Hwang, Jiang-Shiou
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Behavior
Biological and medical sciences
Calanoida
Crustacea
Diurnal change
Epinephelus coioides
Fundamental and applied biological sciences. Psychology
Hydrodynamic disturbance
Invertebrates
Marine
Predation efficiency
Predator avoidance
Predator–prey relationship
Pseudodiaptomus
Sea water ecosystems
Synecology
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Summary:Environmental conditions such as illumination, hydrodynamics, and densities of organisms affect behavior of both, fish fry and their prey with impacts on trophic interactions in ecosystems and aquaculture management alike. The present study demonstrated that the copepod Pseudodiaptomus annandalei perceived juvenile fry of the grouper Epinephelus coioides as predators and exhibited escape reactions mediated mainly by physical and/or chemical signals. Under illumination, prey capture rates were significantly greater ( p < 0.01, Mann–Whitney U test) at moderate turbulence (747 ± 104 individuals/h, n = 3) than in calm water (597 ± 76 individuals/h, n = 3). The maximum darting speed of copepods in response to sensing fish fry in calm water was significantly greater (one-way ANOVA, p < 0.05) than that in either turbulent or enhanced flow conditions, indicating that the ability of copepods to escape from predators was greater in calm water than in turbulent water or enhanced flow conditions. The maximum number of copepods eaten by the fish larvae increased in slow and medium hydrodynamic turbulence compared to either calm water or strong turbulence, suggesting that intermediate levels of turbulence favor predatory larvae.
ISSN:0022-0981
1879-1697
DOI:10.1016/j.jembe.2010.06.005