Nobuaki Arai
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View article: Gravid green turtles employ a mixed capital-income breeding strategy where food is abundant
Gravid green turtles employ a mixed capital-income breeding strategy where food is abundant Open
Sea turtles are marine ectotherms commonly considered capital breeders that use accumulated energy stores for reproduction. In some green turtle Chelonia mydas populations, gravid females feed during the inter-nesting period, indicating th…
View article: Migratory Routes Of The Japanese Common Squid (Todarodes Pacificus) Inferred From Analyses Of Statolith Trace Elements, And Nitrogen And Carbon Stable Isotopes
Migratory Routes Of The Japanese Common Squid (Todarodes Pacificus) Inferred From Analyses Of Statolith Trace Elements, And Nitrogen And Carbon Stable Isotopes Open
No abstracts are to be cited without prior reference to the author.The Sea of Japan is divided by the Subarctic Front into two distrinct regions: the Subarctic and the Tsushima current Japanese common squid (Todarodes pacificus) that inhab…
View article: Spatiotemporal variations in the acoustic presence of dugongs and vessel traffic around Talibong Island, Thailand: Inputs for local coastal management from passive acoustical aspects
Spatiotemporal variations in the acoustic presence of dugongs and vessel traffic around Talibong Island, Thailand: Inputs for local coastal management from passive acoustical aspects Open
Examining the spatiotemporal habitat use by marine megafauna and human activities at a fine scale is important to achieve harmonised management of coastal areas. Passive acoustic monitoring (PAM) can provide this information by observing a…
View article: Striped catfish (Pangasianodon hypophthalmus) exploit food sources across anaerobic decomposition- and primary photosynthetic production-based food chains
Striped catfish (Pangasianodon hypophthalmus) exploit food sources across anaerobic decomposition- and primary photosynthetic production-based food chains Open
Dietary information from aquatic organisms is instrumental in predicting biological interactions and understanding ecosystem functionality. In freshwater habitats, generalist fish species can access a diverse array of food sources from mul…
View article: Spatiotemporal Variations in the Acoustic Presence of Dugongs and Vessel Traffic Around Talibong Island, Thailand: Inputs for Local Coastal Management from Passive Acoustical Aspects
Spatiotemporal Variations in the Acoustic Presence of Dugongs and Vessel Traffic Around Talibong Island, Thailand: Inputs for Local Coastal Management from Passive Acoustical Aspects Open
View article: Experienced water temperature, depth and vertical movements of marbled flounder <i>Pseudopleuronectes yokohamae</i> from summer to winter in Suo Nada, the Seto Inland Sea, Japan
Experienced water temperature, depth and vertical movements of marbled flounder <i>Pseudopleuronectes yokohamae</i> from summer to winter in Suo Nada, the Seto Inland Sea, Japan Open
マコガレイ成魚30個体に水温・深度ロガーを装着し,2017年7月3日に周防灘姫島地先で放流して2個体から12-1月までのデータを得た。高水温となる9月の2個体の経験水温の最頻値は24-25℃(53.9-57.6%)であった。最高経験水温は27℃に達したが26℃以上の頻度は3.9-4.5%と低かった。深度データからは離底行動が観測され,連続した離底行動後に生息水深,生息水温,分布域等が変化した。よって,天然海域では26℃未満の水温帯で生息可能であり,離底行動は移動に関連してい…
View article: Trajectory to local extinction of an isolated dugong population near Okinawa Island, Japan
Trajectory to local extinction of an isolated dugong population near Okinawa Island, Japan Open
View article: Factors associated with canine skin extensibility in toy poodles
Factors associated with canine skin extensibility in toy poodles Open
To assess factors for canine skin extensibility, our study investigated associations between the dogs' skin extension index and the following factors, gender, age, neuter status, weight, coat color and six coat color related gene polymorph…
View article: Deep neural networks based automated extraction of dugong feeding trails from UAV images in the intertidal seagrass beds
Deep neural networks based automated extraction of dugong feeding trails from UAV images in the intertidal seagrass beds Open
Dugongs ( Dugong dugon ) are seagrass specialists distributed in shallow coastal waters in tropical and subtropical seas. The area and distribution of the dugongs’ feeding trails, which are unvegetated winding tracks left after feeding, ha…
View article: Correction to: River to river: First evidence of eel movement between distant rivers via the sea
Correction to: River to river: First evidence of eel movement between distant rivers via the sea Open
View article: Local extinction of an isolated dugong population near Okinawa Island, Japan
Local extinction of an isolated dugong population near Okinawa Island, Japan Open
A small animal population becomes extinct owing to demographic and environmental stochasticity after declining below the minimum viable population (MVP). However, the actual process of extinction derived by stochastic factors after crossin…
View article: Development of wide-area and long-term tracking system for skipjack tuna <i>Katsuwonus pelamis</i> around FADs
Development of wide-area and long-term tracking system for skipjack tuna <i>Katsuwonus pelamis</i> around FADs Open
浮魚礁近傍のカツオの行動生態調査は超音波バイオテレメトリーにより行われてきたが，追跡範囲は制限されていた。そこで新手法として超音波受信システムとデータ通信端末を組み合わせた漁船搭載型受信システムを開発した。本研究では浮魚礁周辺で操業する漁船に開発したシステムを搭載し，カツオの行動生態調査における有効性を検証した。その結果，追跡範囲の拡大，GPSによる個体位置情報の取得，1年を超える長期間の追跡に成功した。また，携帯通信網を介したデータの自動収集によってデータ回収の効率化を実…
View article: Challenge of monitoring cohesive movement in homing fish using fine-scale 3D positioning
Challenge of monitoring cohesive movement in homing fish using fine-scale 3D positioning Open
Rockfish, which are well known for their site fidelity and homing ability, live sympatrically with many conspecifics. Conspecifics may be external drivers influencing rockfish movement, and rockfish may move cohesively while travelling. We…
View article: Correction to: Study of Energy Harvesting from Low-Frequency Vibration with Ferromagnetic Powder and Non-magnetic Fluid
Correction to: Study of Energy Harvesting from Low-Frequency Vibration with Ferromagnetic Powder and Non-magnetic Fluid Open
View article: Record of fishes sampled in Kita-no-ura cove (Lützow-Holm Bay, East Antarctica) in January 2019
Record of fishes sampled in Kita-no-ura cove (Lützow-Holm Bay, East Antarctica) in January 2019 Open
漁業活動や環境変化による南極海洋生態系への影響を評価する上で，魚類相のモニタリングを継続的におこなうことが求められる．2019 年1 月に北の浦（リュツォホルム湾・東南極）でナンキョクカジカ亜目Notothenioidei の魚類計5 種，52 個体を採集した．最も多く採集されたのはショウワギスTrematomus bernacchii（39 個体）であり，次に多く採集されたのはヒレトゲギスT. pennellii（10 個体）であった．本調査では過去の報告に比べてヒレトゲ…
View article: Developing an Inter-individual Communication Biotelemetry System and Application to Chum Salmon Returned to off Japanese Waters
Developing an Inter-individual Communication Biotelemetry System and Application to Chum Salmon Returned to off Japanese Waters Open
behaviors (e.g.
View article: Correction to: Post-release behaviors and movements of cultured and wild Japanese eels (Anguilla japonica) in a shallow brackish water lagoon in northeastern Japan
Correction to: Post-release behaviors and movements of cultured and wild Japanese eels (Anguilla japonica) in a shallow brackish water lagoon in northeastern Japan Open
View article: Study of Energy Harvesting from Low-Frequency Vibration with Ferromagnetic Powder and Non-magnetic Fluid
Study of Energy Harvesting from Low-Frequency Vibration with Ferromagnetic Powder and Non-magnetic Fluid Open
The movement of the creature and the almost wave in the ocean is a low vibration of random energy with a frequency range of 0.1–10 Hz. Because of its low frequency, the opinion has been that electrical energy generation from this low-frequ…
View article: Horizontal distribution and diel movements of 0-year-old hatchery-reared Mekong giant catfish <i>Pangasianodon gigas</i> in Kaeng Krachan reservoir, Thailand, obtained by acoustic telemetry
Horizontal distribution and diel movements of 0-year-old hatchery-reared Mekong giant catfish <i>Pangasianodon gigas</i> in Kaeng Krachan reservoir, Thailand, obtained by acoustic telemetry Open
メコンオオナマズ種苗の放流後の行動追跡のために,超音波発信機を装着した0歳魚15個体を,タイ国ケンカチャン湖に放流した。湖に設置した20台の受信機により,最長252日間のモニタリングに成功した。放流個体の多くは,約1か月間は湖の広い範囲を遊泳し,その後,中央部やダム近くを遊泳するようになった。2か月以上追跡できた6個体で昼夜どちらかのみ受信される期間があり,水平移動の日周性が確認された。全ての個体が発信機の電池寿命前に受信が途絶える,もしくは移動しなくなり,被食,混獲,発信…
View article: Use of rocks as refuges by Japanese eel, <i>Anguilla japonica</i>, in artificial pond, revealed by acoustic telemetry.
Use of rocks as refuges by Japanese eel, <i>Anguilla japonica</i>, in artificial pond, revealed by acoustic telemetry. Open
鹿児島県水産技術開発センターの所有する人工池（21.2 m × 36.0 m，水深1.1 m）において，間隙を持つ石積み，および，間隙が埋められた石積みを作成し，超音波テレメトリー技術を利用してニホンウナギ 8 個体の行動追跡を試みた．砂泥底の実験池内に直径約 1 m，高さ約 0.7 m の円錐型に，石積みを6 基設置した．石積みのうち 3 基に関しては，実験開始 9 日後に砂泥を用いて石材の間隙を塞ぎ，その 26 日後に砂泥を除去した．行動追跡実験の供試個体としてニホンウ…
View article: Habitat use of Japanese eel, <i>Anguilla japonica</i>, in brackish water lake, revealed by acoustic telemetry.
Habitat use of Japanese eel, <i>Anguilla japonica</i>, in brackish water lake, revealed by acoustic telemetry. Open
ニホンウナギは重要な水産資源だが，現在個体群は減少し，環境省および IUCN によって絶滅危惧種に区分されている．個体群を回復させるための対策が求められているが，その生育城である河川や沿岸域の環境をどのように回復すべきか，知見は限られている．本研究では成育場である河川や湖沼，沿岸域の環境の回復策に資することを目指し，福井県久々子湖において，超音波テレメトリー手法を利用して，ニホンウナギ 10 個体の行動を追跡した．超音波発信機を挿入した個体を放流した後，全ての個体が測位可能…
View article: Development of a method for attaching ultrasonic transmitters to Japanese spiny lobsters <i>Panulirus japonicus</i> by using spaghetti tags
Development of a method for attaching ultrasonic transmitters to Japanese spiny lobsters <i>Panulirus japonicus</i> by using spaghetti tags Open
超音波発信機を用いた超音波バイオテレメトリーは長期間連続的に対象生物の位置を計測する手法である。この手法を用いてイセエビを追跡する場合，脱皮に耐えうる発信機の装着方法が不可欠である。本研究では脱皮に耐え得る標識であるスパゲティタグに発信機のダミーを固定した標識を作成してイセエビに装着し，その保持率を調べた。55日間の飼育実験の結果，大型個体では8個体のうち0個体が，小型個体では10個体のうち5個体が実験終了までタグを保持していた。
View article: 4-⑴ What JSFS should be in the future?—2: From the view point of the local branches — Can a senior and the youth activate society activity?
4-⑴ What JSFS should be in the future?—2: From the view point of the local branches — Can a senior and the youth activate society activity? Open
View article: Simultaneous observation of intermittent locomotion of multiple fish by fine-scale spatiotemporal three-dimensional positioning
Simultaneous observation of intermittent locomotion of multiple fish by fine-scale spatiotemporal three-dimensional positioning Open
Recent advances in biotelemetry techniques, especially positioning methods, have revealed the detailed behaviour and movement of aquatic organisms. Behavioural intermittence in animal locomotion, such as the Lévy walk, is a popular topic i…
View article: Development of electrical generator using ferromagnetic powders and non-magnetic fluid
Development of electrical generator using ferromagnetic powders and non-magnetic fluid Open
This paper reports a broadband vibration resonance model for vibration energy harvesting using ferromagnetic powders and suggested a non-resonance type device model by adding a non-magnetic fluid(water) to this device model to support freq…
View article: Clinofibrate improved canine lipid metabolism in some but not all breeds
Clinofibrate improved canine lipid metabolism in some but not all breeds Open
The objectives of this study were to assess if Clinofibrate (CF) treatment improved lipid metabolism in dogs, and to clarify whether its efficacy is influenced by canine characteristics. We collected medical records of 306 dogs and perform…
View article: Increase in predation risk and trophic level induced by nocturnal visits of piscivorous fishes in a temperate seagrass bed
Increase in predation risk and trophic level induced by nocturnal visits of piscivorous fishes in a temperate seagrass bed Open
View article: Development of a method for classifying and transmitting high-resolution feeding behavior of fish using an acceleration pinger
Development of a method for classifying and transmitting high-resolution feeding behavior of fish using an acceleration pinger Open
Background Monitoring the feeding behavior of animals in the wild is key to understanding their energetics and the influence of the environment on their survival. Recently, a novel acceleration transmitter that processes acceleration data …
View article: Evaluation of multipath effects on depth measurements provided by acoustic transmitters in shallow water
Evaluation of multipath effects on depth measurements provided by acoustic transmitters in shallow water Open
View article: The influence of body size on the intermittent locomotion of a pelagic schooling fish
The influence of body size on the intermittent locomotion of a pelagic schooling fish Open
There is a potential trade-off between grouping and the optimizing of the energetic efficiency of individual locomotion. Although intermittent locomotion, e.g. glide and upward swimming (GAU), can reduce the cost of locomotion at the indiv…