Antarctic fish: feeding behavior and parasitic shifts in a changing climate

ByCourtney Glancy

Dr Voranop Viyakarn1, Dr. Suchana Chavanich1, Dr. Pataporn Kuanui1, Dr. Daiki Nomura2, Dr. Kentaro Watanabe2, Dr. Siwatt Pongpiachan3, Dr. Chen Bo4

1Chulalongkorn University, Bangkok, Thailand, 2National Institute of Polar Research, , Japan, 3National Institute of Development Adminstration, , Thailand, 4Polar Research Institute of China, , China

Abstract:

Antarctic ice losses have been increased in the past years.  In this study, the feeding habits of the Antarctic fish Pseudotrematomus bernacchii (Previous name: Trematomus bernacchii) under the fast ice around Japanese Syowa Station and Chinese Great Wall Station were investigated during the summers  between 2004 and 2016.  In addition, Antarctic fish parasites were also monitored.  The results showed that feeding behaviors of fish had been changed over the past years.  Amphipods and krill were the major preys.  However, there was a significant difference in the proportions of larger invertebrates such as squids, octopus and other crustaceans found in the fish stomachs between 2009 and 2016.  Moreover, the percentage of amphipods and krill in fish stomachs declined over the 10-year period in all fish size classes.  From the fish collections, the results showed that parasites of Antarctic fish both ecto- and endoparasites were also increased over the past years.  Several factors including sea ice melting, habitat and environmental changes may have influenced the pattern of feeding behavior and the occurrence of parasites.

Biography:

Currently, Dr. Voranop Viyakarn is an associate professor and head of the Department of Marine Science, Faculty of Science, Chulalongkorn University, Thailand.  His research work includes marine ecosystems in both polar and tropic regions.

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