Article
Fisheries
Anh Tuan Nguyen, Hoc Tan Dao, Hoang Tan Quang, Seishi Hagihara, P. Mark Lokman, Erin L. Damsteegt
Summary: Genetic diversity and population structure analysis of the giant mottled eel in central Vietnam suggests a lack of significant population genetic structuring and the coexistence of North Pacific and South Pacific populations.
Article
Engineering, Environmental
Ophelie Germande, Peggy Gunkel-Grillon, Yannick Dominique, Agnes Feurtet-Mazel, Emilie Bierque, Emilie Dassie, Guillemine Daffe, Fabien Pierron, Isabelle Baudrimont, Magalie Baudrimont
Summary: New Caledonia is heavily impacted by nickel open pit mining activities due to the presence of ultramafic soils rich in metals. The dispersion of particles during the excavation process results in deposition or leaching in rivers, leading to bioaccumulation in downstream organisms. This study investigates the bioaccumulation of metals in eels and its potential effects on their health.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Fisheries
Quanquan Cao, Jie Li, Yiru Sun, Daoqiang Geng, Peng Chu, Hongyu Wang, Shaowu Yin
Summary: The study demonstrated that there are significant changes in osmoregulatory mechanisms in marbled eels when transferred from fresh water to brackish water and saline water, with levels of plasma ions, osmolality, and cortisol consistently higher in saline water than brackish water, indicating efficient acclimation to higher salinities and increased active ion transport and cortisol synthesis in the gill of the eels.
Article
Fisheries
Remigiusz Panicz, Piotr Eljasik, Tuan Thuc Nguyen, Kim Thinh Vo Thi, Duat Van Hoang
Summary: This study identified AngHV-1 associated with mortality in giant mottled eels during winter and spring seasons for the first time. It is recommended to test eel seeds in hatcheries due to the interconnected scheme of tropical eel farms, and proper measures should be implemented for monitoring AngHV-1 prevalence.
JOURNAL OF FISH DISEASES
(2021)
Article
Agriculture, Dairy & Animal Science
Kieu Thi Huyen, Tran Nguyen Ngoc, Ha Thi Hue, Vo Van Quy, Nguyen Quang Linh
Summary: The Marbled Eel (Anguilla marmorata) exhibits morphological differences at different developmental stages, leading to the formation of distinct morphological clusters. This study provides valuable information on the genetic diversity of the species based on analysis of morphological characteristics.
JOURNAL OF APPLIED ANIMAL RESEARCH
(2022)
Article
Fisheries
Kazuki Matsushige, Yoshiya Yasutake, Noritaka Mochioka
Summary: Electrofishing and visual observations revealed that the Japanese eel, Anguilla japonica, and the giant mottled eel, Anguilla marmorata, have different distribution and habitat use in a gentle-slope river in Southern Kyushu, Japan. A. japonica is found in the lower and upper reaches, while A. marmorata inhabits the middle reaches with fast water velocity, heterogeneous water depth, coarse substrata, and no adjacent paddy fields. This has important conservation implications as the disappearance of A. marmorata habitats could result from a decrease in environmental diversity and/or river connectivity.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Environmental Sciences
Dragana Milosevic, Miljan Bigovic, Danilo Mrdak, Ivana Milasevic, Marina Piria
Summary: This study examined the morphological and elemental composition of otoliths in European eels from riverine and lacustrine stocks. The results showed differences in otolith shape indices and microchemistry composition between the two habitats. The study suggested that the otolith fingerprint of European eels is homogeneous, species specific, and independent of ecological conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Fisheries
Daniel Escobar-Camacho, Wilson Andrade, Nathalia Valencia, Andrea C. Encalada, Diana A. Pazmino
Summary: A giant mottled eel specimen was caught in a small stream on San Cristobal Island in Galapagos, confirming its presence in the area. Morphological and molecular analysis confirmed the species as Anguilla marmorata. The rediscovery of this eel in Galapagos supports the hypothesis of an eastward range expansion.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Environmental Sciences
Adam Piper, Alejandro Belen, Bryan Villanueva, Matthew Gollock
Summary: This study used acoustic telemetry to investigate the residence, activity patterns and behavior of the giant mottled eel in two freshwater protected areas in the Philippines. The results showed that the eels' residence and activity patterns varied with habitat type and were affected by river flow and typhoon events.
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
(2022)
Article
Fisheries
Seishi Hagihara, Ryoshiro Wakiya, Tatsuhiko Maeda, Shingo Kimura
Summary: This study examined the morphological and gonadal-histological characteristics of eight silver-phase male Indo-Pacific eels (giant mottled eels) collected from three small rivers on subtropical Amami-Oshima Island, Japan. The findings showed that the silver eels had significantly advanced silvering-related and reproductive characteristics compared to yellow eels.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Ecology
Shotaro Hirase, Yusuke Kumai, Shuya Kato, Seishi Hagihara, Kiyoshi Kikuchi, Mari Kuroki
Summary: This study focused on within-generation latitudinal selection between the northernmost and southernmost individuals of the North Pacific population of Anguilla marmorata. Whole-genome sequencing data showed that these individuals belonged to the same panmictic population, but there were significant genetic differences in certain genomic regions.
JOURNAL OF EVOLUTIONARY BIOLOGY
(2022)
Article
Fisheries
Won Joon Jung, Jun Kwon, Sib Sankar Giri, Sang Guen Kim, Sang Wha Kim, Jeong Woo Kang, Sung Bin Lee, Young Min Lee, Woo Taek Oh, Jin Woo Jun, Se Chang Park
Summary: This study reports the first case of E. piscicida infection causing mass mortality in A. marmorata cultured in Korea. The bacterial strain was isolated and histopathologically characterized to better understand its damage on A. marmorata.
Article
Fisheries
Goldyn Anne G. Aquino, Patrick C. Cabaitan, David H. Secor
Summary: The study observed glass eels Anguilla marmorata collected near the Cagayan River in the Philippines, and found that they showed a preference for freshwater and brackish water over seawater, with higher growth rates and survival rates in these habitats. This raises concerns about the impact of increased fishing pressure, water pollution, and quarrying concentrated in freshwater habitats on the survival of eels.
Article
Fisheries
Ben Parker, Demetra Andreou, Iain D. Green, Katsiaryna Pabortsava, Rose M. Boardman, Adrian C. Pinder, Rosalind M. Wright, Robert Britton
Summary: The microplastic loads in elvers of the critically endangered European eel sampled in three English rivers were very low and did not vary with body length or between rivers. The particles were mostly black, polyolefins, fibres, and fragments of size 101-200 μm. This suggests that local contamination pressure is low and management efforts should focus on mitigating other stressors affecting the species.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Fisheries
Camilla Parzanini, Michael T. Arts, Mehis Rohtla, Janet Koprivnikar, Michael Power, Anne Berit Skiftesvik, Howard Browman, Dino Milotic, Caroline M. F. Durif
Summary: Researchers explored differences in lipid content and fatty acid composition of European eels across different habitats in Norway. Findings showed that eels in different habitats had distinct differences in lipid content and fatty acid composition, reflecting variations in food availability and life history strategies.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Agronomy
Mohammad Belal Hossain, As-Ad Ujjaman Nur, Md. Moudud Ahmed, Md. Akram Ullah, Mohammed Fahad Albeshr, Takaomi Arai
Summary: This study investigated the effectiveness of using hatchery-produced and wild sourced fish seed in homestead ponds in South Asian nations for the cultivation of major carps. The study found that major carps cultivated with wild seed exhibited better growth rate, yield, and return on investment. However, the viability of cultivating major carps with wild seed is limited due to the unstable supply and high cost of wild seed.
Article
Ecology
Quang Minh Dinh, Ngon Trong Truong, Ton Huu Duc Nguyen, Tran Thi Huyen Lam, Tien Thi Kieu Nguyen, Dung Quang Le, Simon Kumar Das
Summary: This study explored the feeding habit, feeding intensity, and food composition of the squaretail mullet. The squaretail mullet is an algi-omnivorous fish, with a high feeding intensity and a diet mostly based on algae. The dominant food items in its diet composition are Bacillariophyta, detritus derived from organic matter, and Cyanophyta, with detritus being the most important food.
ECOLOGY AND EVOLUTION
(2022)
Article
Green & Sustainable Science & Technology
Mohammad Belal Hossain, Md Yeamim Aftad, Jimmy Yu, Tasrina Rabia Choudhury, Md Abu Noman, Md Solaiman Hossain, Bilal Ahamad Paray, Takaomi Arai
Summary: Pollution from shipping, industrial, and municipal wastewater discharges is a major source of heavy-metal contamination at seaports. This study analyzed nine metals in the sediment of two major seaports on the Bay of Bengal coast to evaluate pollution and ecological risk. The concentrations of metals varied, with high levels of Fe and Ni exceeding recommended limits. Overall, there was no heavy-metal contamination, except for moderate risk of Cd contamination. The study suggests monitoring and pollution-control strategies to reduce future hazards.
Article
Biodiversity Conservation
Sima Rani Karmakar, Mohammad Belal Hossain, Md Milon Sarker, As-Ad Ujjaman Nur, Ahasan Habib, Bilal Ahamad Paray, Mohammad Khalid Al-Sadoon, Aneela Gulnaz, Takaomi Arai
Summary: This study describes the diversity and community structure of zooplankton in homestead ponds in a coastal district along the northern Bay of Bengal region. The results show that pH, transparency, nitrates, and phosphates have a significant impact on the abundance of zooplankton species in the study area.
Article
Biology
Liza Akter, Md Akram Ullah, Mohammad Belal Hossain, Anu Rani Karmaker, Md Solaiman Hossain, Mohammed Fahad Albeshr, Takaomi Arai
Summary: This study investigated the diversity, assemblage, and environmental factors influencing harmful algae in coastal homestead fish ponds. The findings showed that 81 genera of harmful algae were identified, primarily belonging to Cyanophyceae, Chlorophyceae, and Bacillariophyceae. Dissolved oxygen, nitrates, phosphates, sulphates, salinity, and transparency were found to influence the abundance of harmful algae. Excessive abundance of harmful algae can have detrimental effects on fish health.
Article
Environmental Sciences
Mohammad Belal Hossain, Md Robel Miazie, As-Ad Ujjaman Nur, Shyamal Kumar Paul, Muhammad Abu Bakar, Bilal Ahamad Paray, Takaomi Arai
Summary: Heavy metal accumulation in aquaculture farms is a major problem. The investigation found that the levels of most heavy metals were below the safe limits. The pollution sources came from diverse factors, indicating the need for suitable measures and continuous monitoring to reduce heavy metal pollution and preserve water quality.
Article
Biology
Mohammad Belal Hossain, Nurer Zaman Bhuiyan, Abul Kasem, Md. Kamal Hossain, Salma Sultana, As-Ad Ujjaman Nur, Jimmy Yu, Mohammed Fahad Albeshr, Takaomi Arai
Summary: This study assessed the levels of toxic metals in fish and shrimp species and the associated health risks to consumers. The findings showed that some metals exceeded national guidelines, indicating potential risks to human health. However, the risk assessment indices did not suggest any carcinogenic risks to consumers. The study also identified possible anthropogenic sources of toxic metals in the area.
Article
Green & Sustainable Science & Technology
Shayla Sultana Mely, Mohammad Belal Hossain, Mahabubur Rahman, Mohammed Fahad Albeshr, Takaomi Arai
Summary: Saltmarsh, as one of the most productive coastal habitats, relies on macroinvertebrate communities for its ecology and productivity. However, little attention has been given to the macroinvertebrate communities in subtropical saltmarsh areas. This study aimed to investigate the diversity, community structure, and seasonal variability of macroinvertebrates in a subtropical saltmarsh habitat. The results showed significant differences in community composition and diversity indices between seasons, and the benthic community diversity was influenced by climatic factors.
Article
Green & Sustainable Science & Technology
Md Shamsuddin, Mohammad Belal Hossain, Moshiur Rahman, Md. Farhan Tazim, Md. Romjan Ali, Mst Salamun Kawla, Tajmahal Begum, Mohammed Fahad Albeshr, Takaomi Arai
Summary: Bangladesh, a top fish producer, has experienced significant impacts on its fishing sector due to the COVID-19 pandemic and preventative measures. A survey in the Brahmanbaria subdistrict assessed the effects and mitigation efforts by the Department of Fisheries (DoF). The pandemic negatively affected the income of fishery stakeholders, but the DoF implemented measures to improve the situation and increased fish productivity.
Article
Green & Sustainable Science & Technology
Md. Moudud Ahmed, As-Ad Ujjaman Nur, Yeasmin N. Jolly, Md. Rakeb Ul Islam, Mohammad Saifur Rahman, Shirin Akter, Jimmy Yu, Mohammed Fahad Albeshr, Takaomi Arai, Mohammad Belal Hossain
Summary: Wetlands are diverse ecosystems that provide habitats for numerous organisms, but increased levels of metals in the environment are hindering their ecological functions. This study evaluated the degree of metal contamination in the surface sediment of Tanguar Haor wetland for the first time. The results showed varying concentrations of metals, with arsenic being the most highly concentrated and copper and mercury showing moderate contamination levels. The study also assessed the pollution level using multiple indices and determined that the sampling sites were mostly unpolluted or less polluted by heavy metals.
Article
Agronomy
Md. Abu Sayed Jewel, Md. Ayenuddin Haque, S. M. Wahed Ali, Mst. Eliza Pervin, Md. Giush Uddin Ahmed, M. Shahanul Islam, Mohammad Belal Hossain, Mohammed Fahad Albeshr, Takaomi Arai
Summary: The study aimed to find a suitable combination of rice-fish-vegetable for cultivation in rainfed rice fields, in order to ensure the sustainability and economic growth of agriculture. The integration of BRRI-52 rice variety, B. gonionotus fish species, and Cucumber-spinach vegetable combination resulted in significantly higher net benefit and benefit-cost ratio. Therefore, it is recommended to use this rice-fish-vegetable combination to improve food security and sustainability in rainfed rice fields.
Review
Environmental Sciences
Muhammad Bilal, Habib Ul Hassan, Madiha Taj, Naseem Rafiq, Ghulam Nabi, Asif Ali, Karim Gabol, Muhammad Ishaq Ali Shah, Rizwana Abdul Ghaffar, Muhammad Sohail, Takaomi Arai
Summary: The issue of microplastic pollution is a pressing environmental problem faced today and in the future. Plastic fragments accumulate worldwide due to exponential use and mismanagement, exacerbating the problem. The consumption of microplastics by wildlife poses a global concern and potential risk for ecosystems. Despite its detrimental effects on wildlife reproduction, the impact of microplastics on the hypothalamic-pituitary-gonadal (HPG) axis remains unclear. This review emphasizes the reproductive toxicity of microplastics in wildlife, highlighting the urgency to develop effective solutions for mitigating their adverse effects on wildlife reproductive systems and preserving aquatic and terrestrial habitats' integrity.
Article
Engineering, Marine
Bithy Khatun, Md. Abu Sayed Jewel, Md. Ayenuddin Haque, Sumaiya Akter, Mohammad Belal Hossain, Mohammed Fahad Albeshr, Takaomi Arai
Summary: Macro-benthos diversity was studied in a mangrove-dominated Pasur River estuary in Bangladesh during three different seasons. Seasonal variations in water and sediment parameters were observed, and 47 species belonging to 35 families were identified. The highest density of macro-benthos was recorded in the post-monsoon season. The study suggests that the estuary is moderately diverse and influenced by the monsoon. Overall, this research provides important baseline information for further investigations of estuaries. Rating: 8/10
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Biology
Mohammad Belal Hossain, Md Moudud Ahmed, Yeasmin Nahar Jolly, As-Ad Ujjaman Nur, Salma Sultana, Shirin Akter, Jimmy Yu, Bilal Ahamad Paray, Takaomi Arai, Alberto Teodorico Correia
Summary: Potentially toxic elements, such as Hg, As, and Pb, have accumulated in the aquatic ecosystem due to human activities, raising concerns about the contamination of food products, especially fish. A study conducted in a freshwater wetland in South Asia analyzed four selected fish species to assess PTEs contamination and human health risks. The results showed that the contamination level of six PTEs in fish decreased in the order of Fe > Zn > Cu > Pb > As > Hg. However, the estimated intake values and health risk indices indicated that there were no substantial health risks for consumers.
Article
Environmental Sciences
Muhammad Bilal, Madiha Taj, Habib Ul Hassan, Atif Yaqub, Muhammad Ishaq Ali Shah, Muhammad Sohail, Naseem Rafiq, Usman Atique, Mohammad Abbas, Saira Sultana, Umaiya Abdali, Takaomi Arai
Summary: This study observed the presence of microplastics in the crop and gizzard of farmed chickens in Pakistan. A total of 1227 microplastic particles were found in 24 chicken samples, with more particles discovered in the gizzards. The predominant types of microplastics detected were polyvinyl chloride, low-density polyethylene, polystyrene, and polypropylene homopolymer.