Kagoshima University · Division of Fisheries Sciences, School of Agriculture, Fisheries and Veterinary Medicine · 講師

Research keywordsby-catch bottom sediments・Long Line・延縄・漁具

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• 髙﨑 蒼, 志水 勝好, 小針 統, 幅野 明正, 中村 啓彦, 内海 真生, 千村 涼 . 高光合成植物ケナフを用いた二酸化炭素深海貯蔵 . 環境科学会誌37 ( 4 ) 131 - 137 2024年7月 詳細を見る2024 · 記述言語： 日本語 出版者・発行元： 社団法人 環境科学会 <p>温室効果ガスであるCO₂排出量を減らす取り組みが世界各国で行われている。しかしこれらの取り組みで，CO₂排出量は減少するが，これまで大量に空気中へ排出されてきたCO₂の絶対量は低下せず，大気中CO₂濃度も低下しない。すなわち空気中のCO₂を除去しなければ，今後現在以上の地球温暖化の進行を招く。そのためネガティブエミッション技術（大気中のCO₂を回収・吸収し，貯留または固定化等を組み合わせることにより，正味としてマイナスのCO₂排出量を達成する技術）の利用が必要である。本研究の目的は光合成能力が高くCO₂を固定量が多いと考えられるケナフ（<i>Hibiscus cannabinus</i> L.）を栽培し，深海に貯蔵することによりケナフによるネガティブエミッション技術の可能性を明らかにすることである。CO₂回収・吸収の評価として2020年および2022年に供試品種にはEverglades 41を用い，2020年は株間が15 cmと30 cm, 2022年は株間10 cm, 20 cmで栽培し，効率的なCO₂固定のための栽植密度を明らかにした。CO₂貯留・固定化に関する実験として2018年にケナフの主茎を30 cm程度に切断し，それらを5本ずつ網袋に入れ，2019年6月に沖縄県近くの東シナ海（N27°02.634′ E125°56.632′）の水深606 mで貯留した。そして2020年9月に回収した。深海係留前の乾物重と比較して深海貯蔵による影響を調査した。その結果ケナフの茎は深海貯蔵前後で乾物重に差は見られなかった。また走査電子顕微鏡観察で，生物による食害の形跡は観察されなかったことから，生物による食害・分解は行われていないものと考えられた。以上のことから，ケナフによるCO₂の深海貯蔵の可能性が明らかとなった。</p> DOI： 10.11353/sesj.37.131 CiNii Research
• 眞子 裕友, 小針 統, 一宮 睦雄, 小森田 智大, 幅野 明正, 東 隆文, 久米 元 . 黒潮およびその周辺海域における仔稚魚の成長活性 . 日本プランクトン学会報69 ( 2 ) 93 - 101 2022年8月 詳細を見る 記述言語2022 · 記述言語： 日本語 出版者・発行元： 日本プランクトン学会 It has been thought that food availability for fish larvae was poor in the Kuroshio because of the low standing stocks of plankton in the oligotrophic conditions under thermal stratification throughout the year. Despite a potential risk or disadvantage for larval survival and growth, Kuroshio and its neighbouring waters are nursery grounds for the early life stages of various fishes. Here, we compared the growth activity of fish larvae among 15 taxonomic groups, including 11 families in the Kuroshio and its neighbouring waters, based on protein synthetase activity and protein contents. Protein-specific (spAARS), individual-based aminoacyl tRNA synthetase activities (iAARS), and protein contents (PRO) of fish larvae ranged from 2 to 232 nmol PPi mg protein−1 h−1, from 1 to 21 μmol PPi ind−1 d−1, and from <1 to 26 mg ind−1, respectively. spAARS, iAARS and PRO were variable among the taxonomic groups and were not classified between mesopelagic groups and the others. Compiling these measurements among all taxonomic groups, a significant negative correlation was found for spAARS to PRO. The correlation showed no significant difference between the Kuroshio and its neighbouring coastal waters, indicating that growth activities to fish larvae body mass were comparable in the Kuroshio and its neighbouring waters. Based on nonmetric multidimensional scaling on spAARS, iAARS and PRO among 15 taxonomic groups, two different groups were classified for fish larvae, represented by the high iAARS under the high PRO but low spAARS (Group 1) and the low iAARS under the low PRO but high spAARS (Group 2), representing the different life strategies for larval growth among the taxonomic groups. The present findings suggest that these biochemical indices are useful for evaluating the growth activity of fish larvae among various taxonomic groups and that food availability is not poor enough to support larval growth in the Kuroshio and its neighbouring waters. DOI： 10.24763/bpsj.69.2_93 Scopus CiNii Research
• Ichinomiya M., Nomiya T., Komorita T., Kobari T., Kume G., Habano A., Arita Y., Makino F. . Seasonal influence of intrusion from the Kuroshio Current on microplankton biomass and community str2022 · 記述言語： 日本語 出版者・発行元： Journal of Marine Systems Seasonal variations in hydrographic conditions, nutrients, and microplankton abundance and biomass were investigated inside and outside Kagoshima Bay in the northern Satsunan area. The area is a nursery ground for the migrating fish. During the mixing season from November to April, highly saline water (>34.5) originating from a branch of the Kuroshio Current, the western boundary current of the North Pacific Subtropical Gyre, intruded from the surface layer into the bay causing extrusion of coastal bottom water. This intrusion generated vertical mixing between surface water and nutrient-rich bottom water. Consequently, chlorophyll a concentrations increased (>1 μg l−1) around the bay mouth. During the stratified season from May to August, the coastal surface water was extruded due to intrusion of saline water from the bottom layer. High chlorophyll a concentrations (>1 μg l−1) were also observed in the surface layer in July during the rainy season. Such differences in hydrographic conditions between mixing and stratified seasons were due to vertical distribution of highly saline water from outside the bay, which seasonally migrated between surface and subsurface layers. Relatively distinct redundancy analysis plots and boxplots generated from a generalized linear model showed that microplankton community structure differed between mixing and stratified seasons. The mixing and stratified seasons were characterized by high diatom abundance and low microplankton abundance, respectively, suggesting that vertical mixing increases nutrient supply and consequently increases diatom abundance. Thus, microzooplankton (mainly naked ciliates and athecate dinoflagellates) abundance was related to the abundance of prey organisms, such as diatoms, thecate dinoflagellates and cryptophyte-like flagellates, rather than hydrographic conditions. Thus, saline water intrusion from a branch of the Kuroshio Current likely governs hydrographic conditions in Kagoshima Bay and consequently affects temporal variations in abundance and taxonomic composition of phytoplankton and microzooplankton communities. DOI： 10.1016/j.jmarsys.2022.103767 Scopus
• Kume G., Shigemura T., Okanishi M., Hirai J., Shiozaki K., Ichinomiya M., Komorita T., Habano A., Makino F., Kobari T. . Distribution, Feeding Habits, and Growth of Chub Mackerel, Scomber japo2016 · 記述言語： 日本語 出版者・発行元： Frontiers in Marine Science To evaluate the importance of the northern Satsunan area in southern Japan as a spawning and nursery ground for chub mackerel (Scomber japonicus), we investigated the early life history characteristics (e.g., larval distribution, feeding habits, and growth) of S. japonicus over five successive years. This area is considered the main habitat and spawning ground of the congeneric species, S. australasicus. Using polymerase chain reaction-restriction fragment length polymorphism analysis, we first confirmed that S. japonicus larvae were abundant in the northern Satsunan area, potentially representing a major spawning and nursery ground in the Japanese Pacific coastal area. The number of recorded larvae started to increase in 2016, corresponding to the population dynamics of the Pacific stock of the species, which has shown increasing trends in recent years. Morphological and DNA metabarcoding analyses of gut contents and stable isotope analysis showed that, in addition to copepods, the larvae fed substantially on appendicularians. The trophic pathway involving appendicularians might support the feeding habits of S. japonicus, promoting its coexistence with other dominant species. Both the instantaneous growth rate and daily specific growth rate were comparable to those in the southern East China Sea, which is the main spawning and nursery ground of the species. Our data strongly suggest that the northern Satsunan area has favorable conditions for sustaining high larval population densities, even during phases with high population numbers. Our results provide insights for the fisheries management for S. japonicus in the Japanese Pacific coastal area, especially during high-stock periods. DOI： 10.3389/fmars.2021.725227 Scopus

• Sinking Motions of Tuna Longline
• Bottom Sediments
• マグロ延縄の沈降運動

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