Kyoto University, Fisheries, Station, Student

3. Students

Tetsuya Yamazaki

山崎哲也 写真Affiliation: Doctoral candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: yamazaki.tetsuya.28n*st.kyoto-u.ac.jp (replace * by @)
Specialty: Marine environmentology
Hobby: travel, reading
Research theme: Seasonal changes in the benthic environment and fauna in the western part of Wasawa bay (Tango sea)
Career and Publications:

Hiroshi Inoue

井上博 顔写真Affiliation: Doctoral candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: inoue.hiroshi.55s*st.kyoto-u.ac.jp (replace * by @)
Specialty: Marine ecology
Hobby: fishing, diving, swimming, volleyball, rugby
Research theme: Structure of the benthic ecosystem in the western part of Sea of Japan
Career and Publications: To elucidate the structure of the benthic ecosystem in the Sea of Japan, I identify, enumerate and weigh organisms that are caught in trawl nets at 200-800 m in depth. Based on such data, I quantitatively construct an ecosystem model for the benthic ecosystem in the Sea of Japan. The model will contribute to policy-making for a constant supply of important fisheries products, which may occupy higher trophic levels in the ecosystem.

Hiroaki Murakami

村上弘章 写真Affiliation: Doctoral candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: murakami.hiroaki.77m*st.kyoto-u.ac.jp (replace * by @)
Specialty: Biology of marine resources
Hobby: fishing, listening to classical music, keeping goldfish, playing baseball
Research theme: Establishment of techniques for the quantitative estimation of marine fish biomass using environmental DNA
Environmental DNA (eDNA) is defined as DNA released from organisms to the environment. Recently, eDNA is preliminarily used for species identification and biomass estimation for aquatic organisms in ponds and lakes. On the other hand, there are few applications of eDNA to marine fish mainly because of the greater spatiotemporal dynamics of fish movement and water current in seas. To establish techniques for the quantitative estimation of marine fish biomass using environmental DNA, I conduct field sampling and mesocosm experiments in the Tango and Maizuru Bays.
Career and Publications:

Takaya Yoden

余田昂彌 写真Affiliation: Doctoral candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: yoden.takaya.86c*st.kyoto-u.ac.jp (replace * by @)
Specialty: biology of marine bioresources
Hobby: snowboarding, playing volleyball, football and baseball
Research theme: Application of environmental DNA to the detection of sources for Japanese sea nettle Chrysaora pacifica
Japanese sea nettle Chrysaora pacifica is a poisonous jellyfish, occurring mainly in summer around Japan. A significant correlation was reported between the jellyfish density estimated through visual observation and environmental DNA (eDNA) released from the jellyfish. In my master thesis, eDNA is applied to the detection of the polyp stage of the jellyfish, which is the asexual generation attached to the sea bottom. Moreover, eDNA is also applied to test the hypothesis that polyps are more abundant where filefish, the natural enemy of polyps, is less abundant. Hopefully, the study contributes to the prevention of jellyfish attacks.
Career and Publications:

Sachia Sasano

笹野写真Affiliation: Doctoral candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: sasano.sachia.75e*st.kyoto-u.ac.jp (replace * by @)
Specialty: fish ecology
Hobby: keeping many kinds of creatures (from sea anemone to finfish), visiting aquariums
Research theme: Characterization of the life history of black sea bream Acanthopagrus schlegelii using Environmental DNA techniques

I use environmental DNA (eDNA) techniques to study black sea bream Acanthopagrus schlegelii. My master’s thesis focused on seasonal changes in the distribution of eDNA that had been released from black sea bream. The eDNA was dispersed to offshore waters only during the spawning season, whereas in the other seasons it was distributed in coastal and estuarine waters. Moreover, the eDNA was detected in fresh water in a river only during summer. Although black sea bream probably spawns in coastal waters, its spawning has not been confirmed in nature. As coastal waters are subject to fresh water and tidal rhythm, black sea bream may develop a spawning strategy of dealing with low salinity conditions. My doctoral research uses eDNA techniques to reveal the spawning ecology of black sea bream. The final goal is to clarify characteristics of black sea bream in terms of adaptation to coastal waters.
Career and Publications:

Tatsuki Toya

戸矢樹写真Affiliation: Master’s candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: toya.tatsuki.67n*st.kyoto-u.ac.jp (replace * by @)
Specialty: fish learning psychology
Hobby: playing the oboe, visiting aquarium, keeping tropical fish
Research theme: Factors affecting learning ability and memory retention in fish

Learning is important for animals to adapt themselves to changing environments. Fish have been reported to possess various learning abilities, such as food search, predator avoidance, and spatial cognition. As an application of learning ability to fish stock enhancement, artificial seedlings are expected to improve their behavior through training. Thus revealing factors that may affect learning ability and memory retention is fascinating not only as basic study of psychology but also as applied science. This study focuses on the influence of rearing conditions and training methods on learning ability in fish.
Career and Publications:

Yuki Tsujimura

辻村顔写真Affiliation: Master’s candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: tsujimura.yuki.32u*st.kyoto-u.ac.jp (replace * by @)
Specialty: fish ethology
Hobby: fishing, driving
Research theme: Influence of learning on trade-off between brain development and body growth in fish
Several freshwater fish species are reported to have larger brain volumes under enriched conditions in aquariums (e.g. complex structural setting). This finding indicates that brain development can be influenced by growth environment. Although such information may be useful to understand life history strategies in fish and to improve the survival of artificial fish seedlings in nature, no information is available for marine fish species. Moreover, there is a possibility that some phenomena incidental to larger brain volumes may occur.
In addition to environmental enrichment in aquariums, I focus on the relationship between use and development in fish brain. The present study aims to access brain volumes in striped beakfish Oplegnathus fasciatus juveniles, which are continuously trained for a specific subject under enriched conditions. As the brain consumes energy most among internal organs, a potential trade-off between brain development and body growth is hypothesized.
Career and Publications:

Fumika Kawai

Affiliation: Master’s candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: kawai.fumika.36c*st.kyoto-u.ac.jp (replace * by @)
Specialty:
Hobby:
Research theme:
Career and Publications:

Mikihiro Sonetaka

曽根高幹大写真Affiliation: Master’s candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: sonetaka.mikihiro.62m*st.kyoto-u.ac.jp (replace * by @)
Specialty: studies on marine bioresources
Hobby: fishing, playing tennis, enjoying anime, watching American football games
Research theme: Environmental DNA released from redspotted grouper Epinephelus akaara: ontogeny of diel rhythms and dynamics during spawning
Redspotted grouper Epinephelus akaara is a high-grade fish, known as ‘Ako’ or ‘Yonezu’. Although the stock of this fish is declining in recent years, there is little information about its ecology, specifically spawning in the natural environment. The present study aims at establishing techniques for both estimation of density and detection of spawning in redspotted grouper using environmental DNA. As a first step, I focus on changes in environmental DNA incidental to diel rhythms, ontogeny and spawning.
Career and Publications:

Shintaro Kamimura

上村真太郎写真Affiliation: Master’s candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: kamimura.shintaro.22z*st.kyoto-u.ac.jp (replace * by @)
Specialty: studies on marine bioresources
Hobby: taking photographs, painting, reading, fishing
Research theme: Environmental DNA released from Japanese anchovy Engraulis japonicus: dynamics in relation to predation and spawning
Environmental DNA (eDNA) is a promising tool for monitoring, which overcomes drawbacks with conventional techniques. Information about the presence/absence or biomass of a target species can be gained from DNA fragments that are released from the species to the environment. In general, DNA fragments are influenced by many biotic and abiotic factors before detected as eDNA. Examinations of such influential factors will enable us to use the eDNA technique more accurately. The present study focuses on how predation and spawning affect the dynamics of eDNA in Japanese anchovy Engraulis japonicus.
Career and Publications:

Hiroto Nakajima

中島広人写真Affiliation: Master’s candidate, Division of Applied Biosciences, Graduate School of Agriculture
Contact: nakajima.hiroto.57z*st.kyoto-u.ac.jp (replace * by @)
Specialty: ecology of coastal resources
Hobby: fishing, cycling, keeping fish
Research theme: Transport mechanisms of Lateolabrax japonicus eggs and larvae in Tango Bay
The year class strength of fish is determined by starvation, predation and ineffectual transport. Spawning grounds are formed in areas from which eggs and larvae are transported effectively to nursery habitats, while eggs and larvae utilize water currents for effective transport. To understand the early life history and population dynamics of target fish species, it is important to reveal transport mechanisms of eggs and larvae in relation to water currents. The present study aims at correlating transport mechanisms of eggs and larvae to water currents in Tango Bay. The main target specie is Lateolabrax japonicus, a popular fish in commercial and recreational fishing.
Career and Publications: