Effect of gut content on the vulnerability of copepods to visual predation

Tsuda, Atsushi, Hiroaki Saito, and Taro Hirose

Limnol. Oceanogr., 43(8), 1998, 1944-1947 | DOI: 10.4319/lo.1998.43.8.1944

ABSTRACT: We carried out feeding experiments in natural light using copepods (Acartia and Pseudocalanus) and visual orienting predators (herring larvae and salmon fry) to determine whether feeding copepods are more vulnerable to predation than nonfeeding copepods. The fish fed on copepods with full guts at a significantly higher rates. This observation suggest that nocturnal feeding without migration may sometimes be an advantageous strategy for copepods, making a trade-off between the metabolic disadvantages of starvation during the day with decreased mortality.

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