Ahmed Rashid

• Sylhet Agricultural University

The Haor region in northeastern Bangladesh, characterized by seasonal wetlands and a heavy reliance on fisheries, faces significant challenges due to climate change. Erratic rainfall, prolonged flooding, and ecosystem degradation threaten traditional fishing practices and community livelihoods. This study investigates the potential of climate-resil...

In a biofloc fish culture system, this experiment assessed the effects of stocking densities of 200, 250, and 300 fish/m 3 at treatments T1, T2, and T3, respectively, on the growth and production performances of Anabas testudineus. With a mean final weight of 121.64 ± 1.354 g, T1 produced the largest weight, followed by T2 (111.63 ± 0.552 g) and T3...

High feed cost is a major obstacle for promoting the growth of nutrient-rich fish species like Nile tilapia (Oreochromis niloticus) in cage aquaculture. To address this issue, cage farming of O. niloticus was studied for a 75-day period in the Gurukchi River of Bangladesh. Three different feeding strategies (FS) were tested in floating cages: FS5-...

Determining the most appropriate stocking density for a specific fish species in an ambient condition is essential for successful cage aquaculture in terms of profitability which is mainly governed by growth. The current study was conducted to ascertain which stocking density gives the best result of widely cultured species in cage aquaculture, pan...

For decades, rivers have been used for transporting pollutants loaded with heavy metals (HMs) causing severe pollution in downstream. The current study aimed to review the levels and sources of 10 HMs, viz. As, Pb, Cd, Cr, Fe, Mn, Cu, Co, Ni, and Zn in the surface water of the rivers in Bangladesh. The PRISMA criteria were used to conduct a systema...

Dekhar Haor, a significant wetland area in Bangladesh, harbors rich biodiversity and plays a crucial role in its ecosystem. This study employs satellite data (Landsat 8 imagery) to explore landscape transformations spanning the last decade. The methodology involves creating training data by sampling regions from imagery based on predefined classes...

Swamp forests, perennially, periodically, or seasonally submerged in freshwater, are recognized as vital ecosystems globally and often referred to as a "biological supermarket" due to their immense biodiversity (Nabahungu and Visser, 2011; Siddika et al., 2020). Ratargul Swamp Forest is a freshwater swamp forest located at the northeast of Banglade...

Baikka Beel is a closed waterbody in the Hail Haor at Moulvibazar district of Bangladesh. Considering its importance to fish and wildlife the Government of Bangladesh declared it as a permanent sanctuary in 2003. However, there is no recent work to identify the changes that occurred in this beel. Therefore, this study was undertaken to assess the s...

The macroalgal bloom (MAB) is caused by brown algae forming a floating mat. Most of its parts stay below the water surface, unlike green algae; thus, its backscatter value becomes weaker in the synthetic aperture radar (SAR) images, such as Sentinel−1, due to the dampening effect. Thus, brown algae patches appear to be thin strands in contrast to g...

This study aimed to investigate the seasonal and spatial variations in water quality parameters and to determine the main contamination sources in the Shari-Goyain River, an economically important and ecologically critical transboundary river in Bangladesh. Therefore, surface water samples were measured monthly from six sampling sites, where six wa...

The experiment was carried out for 94 days in the renowned Ratargul Freshwater Swamp Forest of Bangladesh in order to assess the production performance and economics among three locally high-demand catfish species with a view to selecting suitable species for cage culture. Magur (Clarias batrachus), pabda (Ompok pabda) and pangas (Pangasianodon hy...

This study summarises the scenario of maritime traffic anomalies, like the increased congestion and U-turn of ships caused by the ship grounding in the Suez Canal in March 2021. Here, satellite automatic identification system based ship trajectories, and Sentinel-1 and Sentinel-2 images based ship positions are analysed after subdividing the study...

Brush pile (katha), a fish aggregating device, has been widely used in the Shari-Goyain River since 2003 to congregate fish for easier catch. Katha is usually used during the winter season when the water depth decreases. Hence, this experiment was conducted from November 2018 to March 2019 on katha fishing to investigate its status and impacts on f...

The present study analyzes the market access of the biggest fish market at Chattogram coastal region of Bangladesh affected by COVID-19. The food chain was reduced locally, regionally, and globally as supply chains were disturbed and international seafood exports were halted for a certain period. For data collection several qualitative data collect...

Fish sanctuary is considered as an important structural management tool for restoring fish biodiversity and enhancing fisheries production. Therefore, this study was conducted in the Ratargul Swamp Forest (RSF) of Bangladesh to evaluate the impact of a fish sanctuary on native fish biodiversity in and around the forest ecosystem. The investigation...

Marine fisheries resources face major anthropogenic threat from unregulated fishing activities; thus require precise detection for protection through marine surveillance. Korea developed an efficient land-based small fishing vessel monitoring system using real-time V-Pass data. However, those data directly do not provide information on fishing acti...

A ship collision occurred in the Yellow Sea near the Qingdao port of China at 00:50 UTC on 27 April 2021 due to visibility restriction by sea fog. It caused a huge amount of oil spills into the Yellow Sea from the tanker ship, A Sympony. The target of this study is to remotely detect the oil spill and its coverage as well as detect the ship from wh...

Determining a suitable stocking density of fish for an ambient condition is very important for economic benefit in cage aquaculture, which is not yet tested for many species in Sylhet district of Bangladesh. Therefore, current research was conducted in order to explore the effect of various stocking densities on growth and production performances o...

A checklist of the native fishes of the Dhanu River and adjacent waters at Mithamain Upazila under the Kishoreganj district of Bangladesh is prepared with details on their availability, conservation status, habitat preferences, population trends, and threats. Data were collected monthly by field survey, focus group discussions, and personal intervi...

This study was conducted in the Dhanu River and adjacent waters at Mithamain upazila (sub-district) under Kishoreganj district of Bangladesh to prepare a check list of available native fishes with their availability status, conservation perspectives, habitat preferences, population trends and intimidations. Data were collected monthly by direct fie...

The study was conducted from September 2017 to August 2018 to investigate the fish diversity status of the Shari-Goyain river, in the northeastern part of Bangladesh. A total of 66 fish species belong to 9 orders and 27 families were identified. Among these, almost 80% of the total fish population was from the orders, Siluriformes, Cypriniformes, a...

Colistin is a widely used antibiotic against infections caused by extensively drug-resistant Gram-negative bacteria. It is critical to track and monitor the presence of mcr-like genes and colistin resistance to protect a last resort treatment against highly antibiotic-resistant bacteria. In the present study, the colistin resistance gene mcr-1 was...

This study was conducted from December 2016 to November 2017 to assess the status of fish diversity in the Khiru River of Mymensingh district in Bangladesh. Primary data were collected through questionnaire interviews of 80 fishermen, 8 focus group discussions, and 5 key informant interviews. A total of 64 fish and prawn species under 22 families a...

SARS-CoV-2, a new coronavirus strain responsible for COVID-19 has emerged in Wuhan City, China and still continuing its worldwide pandemic nature. Considering the severity of the disease, a number of studies are underway, and full genomic sequences have already been released in the last few weeks to enable the understanding of the evolutionary orig...

Nowadays, climate change has become a severe issue for aquatic dweller. As the climate is changing gradually, it's affecting all types of terrestrial and aquatic creatures. Ocean lives are not out of the danger of the climate change. Many researches warned about this a few years back, and it's demonstrating now. The total population of the fishes i...

Degradation of fish diversity in the freshwater habitats, especially the rivers of Bangladesh, has become a major concern in recent years. Therefore, this study was conducted in the Gurukchi River of Gowainghat sub-district in the Sylhet district of Bangladesh between March 2018 and February 2019 to assess the availability and biodiversity of fish...

Degradation of fish diversity in the freshwater habitats, especially the rivers of Bangladesh, has become a major concern in recent years. Therefore, this study was conducted in the Gurukchi River of Gowainghat sub-district in the Sylhet district of Bangladesh between March 2018 and February 2019 to assess the availability and biodiversity of fish...

Antimicrobial resistance gene mcr-1 has been disseminated globally since its first discovery in Southern China in late 2015. However, the mcr-1 gene had not been identified previously in Salmonella isolates from poultry in Bangladesh. Here, we aimed to explore antimicrobial resistance gene mcr-1 in Salmonella isolates. Eighty two Salmonella isolate...

Recently a new coronavirus strain, COVID-19 has emerged in Wuhan City, China which cause disease and in many cases deaths to humans. Considering its severity a number of works are working on it and full genomic sequences has already released in the last few weeks to understand the evolutionary origin and molecular characteristics of this virus. Bas...

Recently a new coronavirus strain, COVID-19 has emerged in Wuhan City, China which cause disease and in many cases deaths to humans. Considering its severity a number of works are working on it and full genomic sequences has already released in the last few weeks to understand the evolutionary origin and molecular characteristics of this virus. Bas...

Foot and mouth disease (FMD) is a highly contagious and devastating viral disease among all cloven-footed animals. In Bangladesh, the disease is endemic, with outbreaks occurring throughout the year in the haor regions. Thus, the FMD outbreaks impact livelihoods in the haor area and are of great concern. Therefore, a cross-sectional study was under...

This study was conducted among the residing fishermen of the Shari-Goyain River, Bangladesh to assess the socio-demographic status. The highest percentage (46.25%) of the fishermen belonged to middle age group, and 68.75% were Muslim. Among the respondents 61.25% had nuclear family, 17.50% had no education, 72.50% had access to drinking water from...

This study was conducted to assess the present status of ichthyofaunal assemblages in the Juri River of Fenchuganj upazila in Sylhet district, Bangladesh. Survey works were made in three different locations of the river during May to December, 2018 comprising direct fish catch observations, questionnaire interviews, focus group discussions with fis...

People of the haor regions of Bangladesh are poor; thus many of them cannot buy sufficient amount of protein to meet their daily nutrition demand.However, this vast low lying haor regions can be utilized to produce fish, vegetables and meat. Therefore, for proper utilization of these waterbodies a modified backyard aquaponic system is proposed thro...

Bangladesh is a riverine country with limited pollution load as a whole except few rivers. However, at present heavy metal pollution has become one of the most alarming environmental problems in the country as those are deteriorating water and sediment quality which ultimately threatens aquatic as well as terrestrial life. Unplanned industrializati...

This work focuses on the detection of tiny macroalgae patches in the eastern parts of the Yellow Sea (YS) using high-resolution Landsat-8 images from 2014 to 2017. In the comparison between floating algae index (FAI) and normalized difference vegetation index (NDVI) better detection by FAI was observed, but many tiny patches still remained undetect...

The Sundarbans Mangrove Forest (SMF) is a complex ecosystem containing the most diverse and abundant natural resources of Bangladesh. The research was designed to investigate the socio-economic characteristics and fishing operation activities of the artisanal f ishers in the SMF through case studies. Despite the great importance of mangroves in the...

In this study, hourly shift of green tide (GT) in the Yellow Sea (YS) during summer of 2015 and 2016 is investigated using Geostationary Ocean Color Imager-based normalized difference vegetation index images. The GT started blooming around 45 and 8 km away from the coasts in the western parts of the YS during May 2015 and May 2016, respectively. Th...

Land masking of Synthetic Aperture Radar (SAR) images is generally accomplished by applying either archived shoreline databases or image segmentation. However, those methods cannot be solely applied to geographical areas complicated with many small islands and exposed rocks. Therefore, we have proposed a new procedure where Sobel edge extraction is...

In this paper, we have proposed a method of sea fog prediction using model sea surface wind (SSW) data and hourly optical satellite data with 500 m spatial resolution. Three sea fog cases in the Yellow Sea were selected from Geostationary Ocean Color Imager (GOCI) images, and their shifts were determined from the fog cluster centroid displacements...

In this study, the assemblage structure of nektonic fauna were studied in relation to some important environmental variables in the Meghna Estuary, the largest estuarine ecosystem of Bangladesh. Silica, nitrite, phosphate, and total suspended solids (TSS) were found to be positively correlated with fish species abundance. Nitrite and TSS showed sig...

This study covers temporal distribution of shellfish species composition, abundance and water quality parameters in the Karnaphuli Estuary, Bangladesh. Samplings of shellfishes were done using estuarine set bag net along with sampling of water quality parameters in winter, pre-monsoon, monsoon and post-monsoon from 2013 to 2014. All of the multivar...

Sea fog is a common oceanic weather phenomenon that sometimes results in ship wrecks from reduced visibility; hence needs to be monitored regularly. The Geostationary Ocean Color Imager (GOCI) provides 500m spatial resolution hourly during the daytime. Knowing the trend of sea fog movement over time specific to regions and seasons have the feasibil...

Climate change is the burning issue of the present world and considered as a social fabrics. Present study was carried out at Sitakunda coast, Chittagong and aimed to assess the trend of climate change and identify its impact on coastal fisheries. Meteorological data for assessing climate change trend from 1980 to 2010 were collected from meteorolo...

The study was carried out on fish marketing system of Sylhet sadar upazila to find out the existing marketing channels and also to explore marketing cost and income of wholesalers and retailers in the study areas. The present investigation was conducted for a period of April to September 2014 in five different markets of Sylhet sadar upazila. A tot...

The study was conducted to identify the present status of fish biodiversity in Dekhar Haor of Sunamganj for a period of 11 months from June 2013 to April 2014. It was done by questionnaire interviews (QI) of fishers, focus group discussions (FGD), key informant interviews (KII) and secondary data collection. During the study period, a total of 84 f...

The inadequate supply of tilapia seed mostly fingerling which consider as the secured stock because of lower mortality rate is considered as one of the major present constraints to the development of the culture industry in annual flooded region of haor in Bangladesh. The floating bamboo net-hapa nursery system was observed to be very efficient in...

The research work was conducted to ascertain the recent status of moulting and growth performance of prawn by surveying four prawn farms with a brief questionnaire in Bagerhat region located in the east-southern part of Bangladesh. The data was collected in different times, firstly from April to May, secondly from June to July and finally from Augu...

The study was carried out to assess the effects of stocking density on growth and production of GIFT for a period of 100 days. Three stocking densities were used 150, 200 and 250 fish/decimal; designated as treatment T 1 , T 2 and T 3 respectively having two replicates for each. Commercial pellet feeds were fed at the rate of 30% body weight up to...

During the period March 2007 to September 2009 broodstock, nauplii and postlarvae (PL) collected randomly during different months from the shrimp hatcheries in the southeast region of Bangladesh were screened for white spot syndrome virus (WSSV) by polymerase chain reaction (PCR). PCR method was performed for detection of WSSV. Prevalence of WSSV r...