Article
Biodiversity Conservation
Fernando G. Taboada, Jong-Yeon Park, Barbara A. Muhling, Desiree Tommasi, Kisei R. Tanaka, Ryan R. Rykaczewski, Charles A. Stock, Jorge L. Sarmiento
Summary: Subseasonal to decadal ocean forecasting plays a crucial role in managing living marine resources in a changing ocean. This study demonstrates the importance of incorporating three-dimensional biogeochemical information into ecological forecasts to anticipate fluctuations in bigeye tuna populations in the Pacific Ocean. The findings highlight the impact of ocean warming and deoxygenation on the dynamics of bigeye tuna and emphasize the need for efficient dynamic management strategies to promote sustainable use of marine resources.
JOURNAL OF APPLIED ECOLOGY
(2023)
Article
Fisheries
Xiaofei Shi, Jian Zhang, Xiao Wang, Yixi Wang, Cheng Li, Jiangao Shi
Summary: This study investigated 756 yellowfin tuna caught in the tropical western and central Pacific Ocean, showing that reproductive traits were influenced by various factors, with the main spawning period from September to December and the 50% first maturity FLs of males and females being 111.96 cm and 119.64 cm, respectively.
Article
Ecology
Marcos D. Calle-Moran, Magaly P. Fogacho-Guingla, Ana R. Hernandez-Tellez, Felipe Galvan-Magana
Summary: This study reports on the reproductive biology of the bigeye thresher in the Ecuadorian Pacific Ocean, providing valuable information on its sex ratio, size at maturity, gestation period, and fecundity. This information can contribute to the development of effective fishery management plans for the conservation of this species.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Jihwan Kim, Hanna Na
Summary: This study investigated the interannual variability of yellowfin and bigeye tuna catches in the southwestern tropical Indian Ocean over 25 years and found that the catch amounts in the northern region are related to temperature, salinity, and current variability. The catch variability in the northern region is more closely related to El Nino-Southern Oscillation.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Fisheries
Keisuke Satoh, Haikun Xu, Carolina V. Minte-Vera, Mark N. Maunder, Toshihide Kitakado
Summary: This study revealed the size-specific spatiotemporal dynamics of bigeye tuna in the eastern Pacific Ocean, showing spatial segregation by size and different distribution patterns for adult, intermediate size, and juvenile fish. The study also observed spatial restructuring by size in response to El Nino and La Nina events, highlighting the impact of oceanographic conditions on fish distribution and movement.
FISHERIES RESEARCH
(2021)
Article
Fisheries
Cheng Zhou, Rong Wan, Jie Cao, Liuxiong Xu, Xuefang Wang, Jiangfeng Zhu
Summary: The study reveals that the habitat preference of bigeye tuna is influenced by oceanographic features, hydrological conditions, and climate variability, leading to noticeable dynamic variations in the response. In the North Pacific, the size of high-quality habitat follows a strict seasonal cycle, peaking during the winter.
FISHERIES OCEANOGRAPHY
(2021)
Article
Green & Sustainable Science & Technology
Johann D. Bell, Inna Senina, Timothy Adams, Olivier Aumont, Beatriz Calmettes, Sangaalofa Clark, Morgane Dessert, Marion Gehlen, Thomas Gorgues, John Hampton, Quentin Hanich, Harriet Harden-Davies, Steven R. Hare, Glen Holmes, Patrick Lehodey, Matthieu Lengaigne, William Mansfield, Christophe Menkes, Simon Nicol, Yoshitaka Ota, Coral Pasisi, Graham Pilling, Chis Reid, Espen Ronneberg, Alex Sen Gupta, Katherine L. Seto, Neville Smith, Sue Taei, Martin Tsamenyi, Peter Williams
Summary: Climate change will impact the distribution of tuna in Pacific Small Island Developing States, potentially causing declines in fish catches and government revenue under high emissions scenarios. However, reducing greenhouse gas emissions could lead to sustainability for tuna-dependent Pacific Island economies. Regional cooperation within fisheries management organizations may help safeguard the benefits derived from tuna despite climate-induced shifts in fish distribution.
NATURE SUSTAINABILITY
(2021)
Article
Fisheries
Haruhiko Hino, Takashi Kitagawa, Takayuki Matsumoto, Yoshinori Aoki, Shingo Kimura
Summary: As the body size of juvenile bigeye tuna increases, changes in thermoregulatory mechanisms were observed with higher thermal excess during characteristic behaviors compared to associative behaviors. The increase in thermal excess in both behaviors can be attributed to decreases in the whole-body heat transfer coefficient. It appears that physiological thermoregulation develops with body size to adapt to deeper waters and support the increasing energy demands of larger fish.
FISHERIES OCEANOGRAPHY
(2021)
Article
Fisheries
So Ryung Shin, Hyeon Jin Kim, Jae Won Kim, Dae-Hyeon Kwon, Junghwa Choi, Jung Jun Park, Jung Sick Lee
Summary: This study aimed to gather information on the sex ratio, spawning period, and size at sexual maturity of the largehead hairtail Trichiurus japonicus in Korean waters for effective fishery management. The study revealed a sex ratio of 1:0.46 (female:male) showing a higher proportion of females as fish increased in length. The oocyte development pattern was group-synchronous development, and the main spawning season was estimated to be bi-annual (May-June and September-October). The logistic regression model determined the anal length of fish at 50% sexual maturity to be 16.38 cm (female) and 18.31 cm (male).
Article
Multidisciplinary Sciences
Mi Ryu, Jae Geun Kim
Summary: Land crabs are threatened by ocean sprawl despite playing a key role as consumers in coastal forests. Female land crabs migrate annually to release larvae, facing the risk of road mortality which can lead to a decline in the population. Mitigation actions such as prohibiting vehicular traffic during spring tides in the breeding season may increase the viability of the population.
SCIENTIFIC REPORTS
(2021)
Article
Physiology
Takashi Kitagawa, Takaaki K. Abe, Keitaro Kubo, Ko Fujioka, Hiromu Fukuda, Yosuke Tanaka
Summary: This study aimed to clarify the development of the ability of Pacific bluefin tuna (PBT) to maintain a high body temperature. The research found that PBT can maintain higher body temperatures as they grow and their ability to maintain a high body temperature is independent of the surrounding ambient temperature when the fish reach a certain size. The study also revealed the changes in whole-body heat-transfer coefficient and heat-production rate during growth.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Fisheries
H. Lin, J. Wang, J. Zhu, X. Chen
Summary: Climate change and fishing pressure have impacts on the distribution and abundance of bigeye tuna in the Pacific Ocean. Researchers constructed a multi-output neural network model to analyze the response of bigeye tuna to natural and anthropogenic factors. The study found that environmental variables and fishing operations are key factors determining the spatiotemporal distribution and abundance dynamics of bigeye tuna. The research also revealed the influence of El Nino events on the locations of major habitats and the resource abundance of bigeye tuna, as well as the different distribution patterns of bigeye tuna under different fishing methods.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Come Denechaud, Audrey J. Geffen, Szymon Smolinski, Jane A. Godiksen
Summary: The study suggests that spawning zones may be a universal trait of Atlantic cod and not limited to specific environments or migratory behaviors. Age at maturity derived from spawning zone data shows similar trends to gonad maturity stages, but there is a lag of one to two years between spawning events and sexual maturity, likely reflecting a stabilization of energy partitioning.
Article
Reproductive Biology
Takao Hayashida, Kentaro Higuchi, Hiroshi Hashimoto, Yukinori Kazeto, Takeshi Eba, Sota Yoshikawa, Rie Goto, Kogen Okita, Toshinori Takashi, Keita Ishii, Takashi Yamashita, Kazunori Kumon, Koichiro Gen
Summary: This study demonstrated the gonadal sex differentiation and early development of ovaries and testes in Pacific bluefin tuna. The results provide a basis for future research on sterile PBT production.
Article
Limnology
Daniel Ottmann, Tom J. Langbehn, Patricia Reglero, Diego Alvarez-Berastegui, Oyvind Fiksen
Summary: This study reveals the important impact of mesopelagic fish on the reproduction and offspring fitness of pelagic fish and suggests an evolutionary drive to synchronize spawning to the lunar cycle. The week before full moon is the most intensive spawning period for Atlantic bluefin tuna, consistent with predictions from a mechanistic model, which shows that spawning around full moon can significantly increase offspring fitness by reducing predation pressure from mesopelagic fish.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Biochemistry & Molecular Biology
Guoping Zhu, Yingying Li, Danrong Wang, Hui Liu
Summary: This study analyzed the levels of zinc, copper, cadmium, and lead in different tissues of mackerel icefish in South Georgia, finding that zinc was the highest element in muscle, skin, intestine, liver, and gill among the four elements studied.
BIOLOGICAL TRACE ELEMENT RESEARCH
(2022)
Article
Environmental Studies
Julian Ashford, Michael Dinniman, Cassandra Brooks, Lian Wei, Guoping Zhu
Summary: The research focuses on transport pathways between different life history areas of Antarctic toothfish, identifying key areas for adult spawning aggregation. The importance of protecting adjacent areas along critical life history pathways is emphasized, along with discussions on available policy instruments.
Article
Biodiversity Conservation
Danrong Wang, Guoping Zhu
Summary: The study focused on the concentrations of trace elements in Antarctic krill in the northern Antarctic Peninsula to assess its suitability as a bioindicator of regional heterogeneity in marine environments. The results showed that copper was the most concentrated element followed by zinc, lead, and cadmium, with significant variations in concentration levels observed across different hydrographic settings in the region.
ECOLOGICAL INDICATORS
(2022)
Article
Fisheries
Qingyuan Yang, Keith Reid, Guoping Zhu
Summary: This study investigates the adaptability and dietary variability of the Southern Ocean predator Chaenodraco wilsoni in response to potential changes in food availability. The study finds that the muscle fatty acid composition of C. wilsoni varies in different marine environments, which is influenced by factors such as photoadaptation and carbon sequestration in phytoplankton, seasonal phytoplankton succession, the presence of dinoflagellates, and the effects of El Nino-Southern Oscillation and food chains based on flagellates and copepods. The study concludes that C. wilsoni shows an ability to adapt and survive in the face of climate change.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Engineering, Environmental
Jingqian Xie, Ling Tao, Qiang Wu, Zhihe Bian, Mengqiu Wang, Yingming Li, Guoping Zhu, Tian Lin
Summary: The study found that bioaccumulation of OCPs in Antarctic krill is influenced by habitat and biological traits, with the existence of growth dilution phenomenon. There is no fresh OCPs input in Antarctica except for endosulfan I. OCP levels show tissue and sex dependence, with lipid content being the main influencing factor.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Zoology
Xiaoying Wei, Guoping Zhu
Summary: Analysis of otolith shape and ontogenetic variations in ocellated icefish provides valuable insights into the morphological changes during development, contributing to ecological, population structure, and life history studies.
Article
Environmental Sciences
Yi Shen, Guoping Zhu
Summary: This study provides baseline data on the distribution of trace elements in Ocellated icefish in the northern Antarctic Peninsula (NAP). The results show that Zn has higher concentrations, while muscle has the lowest element concentrations. It was also found that Zn and Cd concentrations in the stomach and intestine are significantly positively correlated. The study suggests that C. rastrospinosus could be a useful bioindicator for monitoring variability in trace elements dynamics in NAP.
MARINE POLLUTION BULLETIN
(2022)
Article
Fisheries
Yuwen Chen, Guoping Zhu
Summary: Species identification through fish otoliths is effective but can be misleading due to allometric growth, especially in juvenile fish. In the Southern Ocean, Chionodraco rastrospinosus, Krefftichthys anderssoni, Electrona carlsbergi, and Pleuragramma antarcticum are frequently caught together, making species identification challenging. This study utilized machine learning techniques and introduced a triplet loss function to reduce confusion caused by allometric growth. The neural network model with the triplet loss function achieved the highest classification accuracy of 96%, improving otolith classification under limited sampling effort.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Fisheries
Kai Huang, Guoping Zhu
Summary: The energy density and fatty acid composition profiles of female mackerel icefish from the South Orkney Islands in Antarctica were studied to understand its reproductive allocation strategy and the role of specific fatty acids in reproduction. The results showed that the energy density in gonads increased during ovarian development, while the energy density in muscles remained constant, suggesting that the spawning events of this species rely on energy income from feeding. The variation in fatty acid composition between muscle and gonad tissues may reflect the role of main fatty acids as an energy source.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Environmental Sciences
Shulin Han, Guoping Zhu
Summary: This study investigated the trophic niches and accumulation and transfer of four trace elements (Cu, Cd, Zn, and Pb) from Antarctic krill to mackerel icefish. The concentrations of these elements in krill were significantly higher than in icefish. There was a bio-dilution effect of these elements from krill to icefish, with Cu having the lowest biomagnification factor. Cu concentration in krill was correlated with δ15N and δ13C, while Pb enrichment in icefish was affected by δ15N.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Jianchun Yu, Guoping Zhu, Yasong Wang, Yinghui Wang, Lulu Han, Zijun Liu, Xi Zhang, Yunping Xu
Summary: Polar ecosystems are vulnerable to climate warming and sea ice decline. By analyzing surface water samples from the Southern Ocean off Prydz Bay, this study found that sea ice melting has a significant impact on the concentration and composition of dissolved organic matter (DOM). During the sea ice melting season, higher concentrations of DOC and protein-like components were observed, while during the post-sea ice melting season, lower concentrations of DOC and humic-like components were found. The results suggest that sea ice melting drives a transition from more labile to more refractory DOM in the polar ocean.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Qingning Geng, Congcong Wang, Guoping Zhu
Summary: Studies on microplastic ingestion by fish in the remote Antarctic are limited. This study is the first to report the distribution of microplastics in the ocellated icefish (Chionodraco rastrospinosus) in the northern Antarctic Peninsula. Out of 32 individuals, 31.3% ingested microplastics. A total of 157 suspected microplastic particles were detected, with 10 finally confirmed. Fibrous microplastics with a diameter of <200μm were predominant, with blue microplastics being the most common. Polyester and acrylic acid were the most frequently observed plastic polymers. The abundance of microplastics in C. rastrospinosus was unrelated to biometrics.
MARINE POLLUTION BULLETIN
(2023)
Article
Geosciences, Multidisciplinary
Qingyuan Yang, Guoping Zhu
Summary: This study investigated the feeding habits of the spiny icefish in the Bransfield Strait and used biochemical tracers to demonstrate the variability in its diet, which is influenced by the availability of krill and the dynamic hydrography. The results highlight the potential of biochemical tracers in reflecting changes in prey's diet in a highly dynamic environment.
JOURNAL OF MARINE SYSTEMS
(2024)
Article
Ecology
Bixue Wang, Jing Ning, Guoping Zhu
Summary: This study analyzed ectoparasite infestations in Champsocephalus gunnari and investigated their preference for different parts of the host fish as well as the host-parasite trophic relationship. The results showed that Eubrachiella antarctica had a preference for parasitizing the fins of C. gunnari. The study also found that the relationship between E. antarctica and C. gunnari was parasitic, while Trulliobdella capitis may be a carrier parasite or have a symbiotic relationship with C. gunnari. The existence of specific trophic niches in the marine food web was indicated.
Article
Biodiversity Conservation
Yewei Yu, Yang Liu, Guoping Zhu, Congcong Wang
Summary: In this study, 105 novel SNP markers were developed for the genetic analysis and scientific management of the ocellated icefish.
CONSERVATION GENETICS RESOURCES
(2023)
