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http://dx.doi.org/10.35399/ISK.31.3.4

Feeding Habits of Larval Acanthogobius flavimanus from the Nakdong River Estuary, Korea  

Choi, Hee Chan (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute)
Cho, Jeong Hyun (Fisheries Resources and Environment Division, East Sea Fisheries Research Institute)
Huh, Sung Hoi (Department of Oceanography, Pukyong National University)
Park, Joo Myun (Dokdo Research Center, East Sea Research Institute, Korea Institute of Ocean Science & Technology)
Publication Information
Korean Journal of Ichthyology / v.31, no.3, 2019 , pp. 150-158 More about this Journal
Abstract
We examined the food habits of larval Acanthogobius flavimanus using 260 specimens collected from February to April 2011 in the Nakdong River estuary, Korea. We found that larval A. flavimanus are carnivorous, feeding mainly on copepods and tintinnids. Their diet also included small quantities of larval polychaetes, macrostomids, larval bivalves, rotifers, barnacles, diatoms and unidentified materials. To assess ontogenetic changes in diet composition, the larvae were separated into three developmental stages: preflexion (<7 mmNL), flexion (7~9 mmNL), and postflexion (>9 mmNL). The preflexion group frequently preyed on tintinnids. But as the larvae of A. flavimanus grew, the consumption of copepods for flexion group, and polychaetes for postflexion group, increased respectively. The larvae of A. flavimanus showed one peak for feeding incidence at dusk, but the mean number of preys per individual was high until midnight.
Keywords
Acanthogobius flavimanus; food habits; ontogenetic change; estuary; diel feeding;
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