Article
Ecology
Toshiaki S. Jo
Summary: Understanding the degradation processes of environmental DNA (eDNA) is crucial for accurately assessing species distribution and abundance in marine environments. Biphasic degradation, consisting of initial rapid decay and subsequent slower decay, may provide a more precise description of eDNA fate. However, the factors influencing eDNA decay rates at each phase remain unclear.
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
(2023)
Article
Fisheries
Motomitsu Takahashi, Chiyuki Sassa, Satoshi Kitajima, Mari Yoda, Youichi Tsukamoto
Summary: The study revealed that the growth traits of juvenile Japanese jack mackerel in the southwestern part of the Sea of Japan are influenced by thermal conditions, with slower growth rate in the eastern area due to lower temperatures compared to the western area. Furthermore, the thermal conditions have a significant impact on the abundance of juvenile mackerel.
FISHERIES OCEANOGRAPHY
(2022)
Article
Fisheries
Yuta Narisawa, Yuki Tsutsumi, Yusa Nakamura, Kigen Takahashi
Summary: Blood removal is an important process in the fisheries and aquaculture industries to maintain fish muscle quality. Water perfusion, such as Tsumoto-shiki, is an effective method for blood removal and prevention of quality deterioration in horse mackerel muscle. The study found that water perfusion significantly reduced hemoprotein content and increased moisture content and drip in the fish muscle.
Article
Chemistry, Multidisciplinary
Hansoo Kim, Dong-Guk Paeng
Summary: In this study, it was found that fish schools attenuate acoustic waves at mid-frequency bands and the attenuation increases with the number of fish. Japanese horse mackerel had mean attenuation coefficients of approximately 6.0-15.4 dB/m and maximum coefficients of 6.5-21.8 dB/m. New regression models were proposed based on experimental data to compensate for fish school attenuation. These results highlight the importance of considering and compensating for fish school attenuation in fishery acoustics and naval sonar applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Fisheries
Daisuke Hashida, Takeshi Tomiyama
Summary: In this study, the hatch date and larval growth rate of juvenile Japanese jack mackerel were examined in the Uwa Sea, Japan. It was found that the hatch date ranged from February to April, and the age at the onset of metamorphosis was 25.5-30.5 days. The larval growth rate was 0.30-0.34 mm/day. Significant negative correlations were observed between age at metamorphosis and juvenile abundance. The hatch date and larval growth rate were similar to those of Japanese jack mackerel juveniles from the East China Sea, suggesting that most of the juveniles originated from other waters.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Fisheries
Chiyuki Sassa, Satoshi Kitajima, Motomitsu Takahashi
Summary: The study found that the difference in juvenile instantaneous growth rate (IGR) between different years cannot be fully explained by variations in diet composition. Instead, habitat temperature was identified as the dominant factor causing the observed between-year differences in IGR in the southwestern Sea of Japan.
FISHERIES OCEANOGRAPHY
(2021)
Article
Fisheries
Kazuo Ishikawa, Chikako Watanabe, Takahiko Kameda, Tsutomu Tokeshi, Hikari Horie, Daisuke Hashida, Toshiyuki Ookawa, Takashi Takeda, Masahiro Kuno, Yuki Suzuki, Shozo Takamura, Ryousuke Fukumoto, Sachihiko Itoh
Summary: The population structure of the Japanese jack mackerel Trachurus japonicus in coastal areas adjacent to the Kuroshio Current is influenced by the connectivity between spawning and juvenile/adult habitat areas. Analysis of size composition and commercial landing data reveals that different spawning grounds impact the landing of juvenile fish in different seasons, helping to sustain the population levels of the species.
FISHERIES OCEANOGRAPHY
(2021)
Article
Fisheries
Soyoka Muko, Mari Yoda, Hiroyuki Kurota, Seiji Ohshimo
Summary: To evaluate the potential spatial distribution and estimate the annual trends in abundance index, we developed spatio-temporal models for catch per unit effort (CPUE) of large- and medium-sized purse seine fisheries. The models incorporated various variables including year, month, vessel size, vessel identity, latitude and longitude points, and water temperature. The results indicated that the potential distribution areas for Japanese jack mackerel were mainly found on the continental shelf in the southern part of the East China Sea, the western side of Kyushu Island, and along Honshu Island in the western part of the Sea of Japan.
FISHERIES RESEARCH
(2023)
Article
Multidisciplinary Sciences
Yuting Feng, Haiyi Shi, Gang Hou, Hui Zhao, Changming Dong
Summary: The study analyzed the spatiotemporal distribution of jack mackerel in the Beibu Gulf and identified SLA, month, depth, SSS, and SST as the most crucial factors influencing its variability. The research contributes to a better understanding of the distributional patterns of jack mackerel and provides a basis for sustainable management in the Beibu Gulf.
Article
Psychology, Biological
Yunosuke Chikamura, Kohji Takahashi, Reiji Masuda
Summary: This study found that jack mackerel can choose the composition of a shoal based on visual information, preferring conspecific shoals over heterospecific ones. However, when presented with shoals comprising fewer heterospecifics, the jack mackerel showed a preference for the mixed-species shoal. This suggests that including fewer heterospecifics may exploit oddity effects and reduce competition for food in a shoal while maintaining predator vigilance.
BEHAVIOURAL PROCESSES
(2023)
Article
Food Science & Technology
Daisuke Kyoui, Yuri Fukasawa, Waka Miyanaga, Yui Nakamura, Tsutomu Yamane, Kazuki Sugita, Shun Yamadera, Marie Kai, Kai Shinoda, Taketo Kawarai, Hirokazu Ogihara
Summary: This study aimed to identify the changes in microflora composition and specific spoilage organisms (SSOs) in Japanese horse mackerel during storage. The results showed that Shewanella became the dominant genus in the microflora regardless of the storage temperature, while the dominant amplicon sequence variants (ASVs) differed depending on the storage temperatures, with the dominant ASVs at 20 degrees Celsius being assumed as potential SSOs.
CURRENT RESEARCH IN FOOD SCIENCE
(2022)
Article
Evolutionary Biology
Angela P. Fuentes-Pardo, Edward D. Farrell, Mats E. Pettersson, C. Grace Sprehn, Leif Andersson
Summary: Understanding population adaptation is important for preserving biodiversity in the face of overexploitation and climate change. This study focused on Atlantic horse mackerel, a commercially and ecologically important marine fish. The researchers used genomic data and environmental information to analyze population structure and genetic basis of local adaptation. Their findings revealed low population structure but identified key genetic markers associated with adaptation, such as loci discriminating different regions. The study emphasizes the importance of understanding both life history and climate-related selective pressures in shaping population structure in marine fish.
EVOLUTIONARY APPLICATIONS
(2023)
Article
Environmental Sciences
Francisco Cerna, Guillermo Moyano, Christian Valero, Lizandro Munoz, Guido Plaza, Steven E. Campana
Summary: This study validated the ages of Chilean jack mackerel using three methods, providing crucial information for enhancing stock assessment of this important commercial species.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Chemistry, Applied
Hongyue Li, Yang Wang, Jiaxin Zhang, Xuepeng Li, Jinxiang Wang, Shumin Yi, Wenhui Zhu, Yongxia Xu, Jianrong Li
Summary: In this study, the combination of electronic sensor fusion signals, including electronic nose, electronic tongue, and colorimeter, along with various machine learning algorithms, was utilized to quantitatively assess and predict the freshness of horse mackerel during frozen storage. The results demonstrated that the fusion data contained more information than the independent data, and models such as ANN, RFR, and XGBoost showed good performance in predicting biochemical indexes.
Article
Fisheries
Yosuke Igeta, Chiyuki Sassa, Motomitsu Takahashi, Mizuki Kuga, Satoshi Kitajima, Taku Wagawa, Shoko Abe, Chikako Watanabe, Takashi Setou, Hirohiko Nakamura, Naoki Hirose
Summary: The recruitment of Japanese jack mackerel in the Pacific coastal waters of Japan has been declining since 2000, and the reasons and mechanisms for this decline are still unclear. To investigate the effect of the current system on the transportation of T. japonicus, particle-tracking experiments were conducted using a data assimilation model. The experiments showed that the number of T. japonicus particles transported to the Pacific waters decreased from 2000 to 2017, with a bifurcation towards the Sea of Japan observed during 2006-2017.
FISHERIES OCEANOGRAPHY
(2023)
Article
Biodiversity Conservation
Teruhiko Takahara, Katsuya Fukui, Daisuke Hiramatsu, Hideyuki Doi, Masato Fujii, Toshifumi Minamoto
Summary: This study developed species-specific primer-probe sets for detecting and quantifying environmental DNA (eDNA) of Hypomesus nipponensis and Salangichthys microdon. The results showed that these assays were effective in accurately monitoring the presence and seasonal changes of the fish species, and could potentially be used as a useful tool for fisheries management.
LANDSCAPE AND ECOLOGICAL ENGINEERING
(2023)
Article
Marine & Freshwater Biology
Toshiaki S. Jo
Summary: This study examined the influence of temperature on the relationship between environmental DNA (eDNA) concentration and species abundance using mathematical models and meta-analysis. The findings suggest that warmer temperatures can strengthen this relationship, and a smaller variance in eDNA production rate can increase the correlation.
Article
Ecology
Luhan Wu, Qianqian Wu, Takashi Inagawa, Jiro Okitsu, Shogo Sakamoto, Toshifumi Minamoto
Summary: This study investigates the feasibility of using eDNA analysis to monitor the spawning activity of freshwater fish. Field eDNA surveys were conducted in conjunction with traditional surveys, and a model was established to estimate the periods of spawning activity. This method allows for continuous monitoring of the reproduction of rare, invasive, or important fishery species, reducing the laboriousness of traditional surveys.
FRESHWATER BIOLOGY
(2023)
Article
Fisheries
Teruhiko Takahara, Hideyuki Doi, Toshihiro Kosuge, Nanae Nomura, Nobutaka Maki, Toshifumi Minamoto, Katsutoshi Watanabe
Summary: This study established an effective eDNA method for an endangered Japanese bagrid catfish by considering its ecological characteristics. The addition of BAC reagent for water sample storage was found to be effective. There was no difference in eDNA concentration between different sampling times and different sampling locations in the field. The study also suggested that water samples can be collected during the daytime to reduce the risk of water accidents associated with field eDNA surveys of nocturnal species.
ICHTHYOLOGICAL RESEARCH
(2023)
Article
Chemistry, Analytical
Qianqian Wu, Toshifumi Minamoto
Summary: In recent years, the application of eDNA technology in water environments has become more widespread. This study compares different seawater preservation solutions (RNAlater or ATL) to improve the recovery yields of eDNA. The results show that ATL treatment significantly increases eDNA yields for both vertebrate and invertebrate species compared to RNAlater treatment. Additionally, preservation methods do not significantly affect the number of detected species and species composition according to metabarcoding analysis.
ANALYTICAL SCIENCES
(2023)
Article
Chemistry, Analytical
Masayuki K. K. Sakata, Daiki Takeshita, Ryohei Nishizawa, Takuya Sato, Toshifumi Minamoto
Summary: Loss of biodiversity is a major concern, especially for amphibians. Many small salamanders in Japan are endangered. Environmental DNA analysis is an effective method for monitoring these rare species.
ANALYTICAL SCIENCES
(2023)
Article
Chemistry, Analytical
Toshiaki S. S. Jo
Summary: Environmental RNA (eRNA) analysis is more accurate than environmental DNA (eDNA) analysis in inferring physiological information of species and their distribution and composition. This study validated methodologies for capturing, preserving, and extracting eRNA in water samples using zebrafish. The findings suggest that increasing lysis buffer volume can increase target eRNA concentration, a GF/A filter may collect more eRNA particles due to longer filtration time, and the use of RNA stabilization reagent (RNAlater) can preserve eRNA samples without deep-freezing. These advancements contribute to the refinement of eRNA analysis for monitoring aquatic ecosystems.
ANALYTICAL SCIENCES
(2023)
Article
Ecology
Rio Souma, Izumi Katano, Hideyuki Doi, Teruhiko Takahara, Toshifumi Minamoto
Summary: Environmental DNA (eDNA) has proved to be a useful tool for detecting the presence and abundance of macroorganisms in aquatic systems. In this study, eDNA was sampled from different zones of eight small ponds in Japan, and the captured biomass of three dominant fish species was compared with the eDNA copies obtained through quantitative real-time polymerase chain reaction analysis. Positive correlations were found between the eDNA copies and the total captured biomass of all target fish species, indicating the potential of eDNA measurement for estimating population biomass under natural conditions.
FRESHWATER BIOLOGY
(2023)
Article
Ecology
Hideyuki Doi, Shunsuke Matsuoka, Shin-ichiro S. Matsuzaki, Mariko Nagano, Hirotoshi Sato, Hiroki Yamanaka, Saeko Matsuhashi, Satoshi Yamamoto, Toshifumi Minamoto, Hitoshi Araki, Kousuke Ikeda, Atsuko Kato, Kouichi Kumei, Nobutaka Maki, Takashi Mitsuzuka, Teruhiko Takahara, Kimihito Toki, Natsuki Ueda, Takeshi Watanabe, Kanji Yamazoe, Masaki Miya
Summary: Although eDNA metabarcoding is a valuable tool for biodiversity monitoring, the influence of organism traits and ecosystem characteristics on its performance remains unclear. To address this knowledge gap, we conducted a nationwide study on fish communities in 18 Japanese lakes. Our results indicate that certain organism traits, such as body size and habitat preference, as well as ecosystem size, can affect eDNA detection. These findings highlight the importance of considering species traits and ecosystem characteristics in broad-scale eDNA metabarcoding monitoring.
FRESHWATER BIOLOGY
(2023)
Review
Biology
Toshiaki S. Jo
Summary: Environmental DNA (eDNA) analysis is a cost-effective and non-destructive biomonitoring method with high detection sensitivity in terrestrial and aquatic environments. However, false-positive results can occur due to the detection of aged eDNA that has been released from the individual and detected at a site away from its source. This manuscript proposes new methodologies to estimate the age of eDNA and highlights the shorter persistence of environmental RNA (eRNA) compared to eDNA, aiming to improve the accuracy and reliability of eDNA-based monitoring.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Article
Ecology
Takeshi Miki, Hiroki Yamanaka, Atsushi Sogabe, Koji Omori, Yasuhisa Saito, Toshifumi Minamoto, Kimiko Uchii, Mie N. N. Honjo, Alata A. A. Suzuki, Yukihiro Kohmatsu, Zen'ichiro Kawabata
Summary: For ectotherms, the temperature of their habitat plays a crucial role in disease dynamics. This study investigated how host behavior in response to fluctuating temperature affects disease dynamics using both modeling and field surveys. The results showed that the temperature preferences of individual carp influenced the severity of CyHV-3 infection, and increasing the fraction of warmer coastal areas mitigated the impact of the disease by promoting immunity acquisition. These findings highlight the importance of the thermal regime and host behavior in regulating infectious disease in ectothermic animals.
THEORETICAL ECOLOGY
(2023)
Article
Multidisciplinary Sciences
Kensuke Mori, Akio Imamura, Itsuki Hirayama, Toshifumi Minamoto
Summary: Environmental DNA (eDNA) is used for surveillance and early detection of pathogens and parasites. A new primer-probe set was designed and tested to detect E. multilocularis DNA in eDNA samples collected from streams in Japan. The detection rate was low (0.78%), but repurposed eDNAs may still be useful for surveillance in newly introduced areas. Further research is needed to improve the effectiveness of using eDNA for E. multilocularis detection.
Article
Environmental Sciences
Ippei Aoshima, Ryohei Nakao, Toshifumi Minamoto, Atushi Ushimaru, Masayuki Sato
Summary: This study examined how urban residents perceive the biodiversity of rivers and whether it is influenced by their nature experiences. Quantitative data measured by environmental DNA were used to indicate biodiversity, while a social survey determined residents' perceptions and nature experiences. Regression analysis of 312 responses showed that residents with more childhood nature experiences were more satisfied with waterfront areas as river biodiversity increased. However, those with fewer nature experiences preferred concrete paved rivers for recreational value rather than biodiverse rivers.
CITY AND ENVIRONMENT INTERACTIONS
(2023)
Article
Biochemistry & Molecular Biology
Luhan Wu, Tomonori Osugi, Takashi Inagawa, Jiro Okitsu, Shogo Sakamoto, Toshifumi Minamoto
Summary: Periodic monitoring is important for the protection of endangered fish, sustainable use of fishery resources, and management of alien species. This study developed a quantitative metabarcoding approach to simultaneously quantify the eDNA concentration of an entire fish assemblage in a small reservoir. The results showed that this approach is highly consistent with traditional fish monitoring methods and can provide valuable information for the ecological monitoring of multiple fish species.
MOLECULAR ECOLOGY RESOURCES
(2023)
Article
Economics
Masayuki Sato, Toshifumi Minamoto, Atushi Ushimaru
Summary: This study proposes an interdisciplinary approach to policies for the conservation of suburban and peri-urban ecosystems, emphasizing the importance of evidence-based assessment, investigation from multiple perspectives, and consensus building. Using Satoyama development as a case study, an economic analysis was conducted to understand citizen preferences and needs, and to discuss the consistency between policy targets and citizens' evaluation.
INTERNATIONAL JOURNAL OF ECONOMIC POLICY STUDIES
(2023)
