Research List

No.	Researcher	Title	Abstract	Year
2561	Kay Khaing Lwin1*, Kay Lwin Tun2, Cho Cho Thin3	SEASONAL VARIATIONS OF HEAVY METALS ANALYSIS IN SOME FISH SPECIES, CHINDWIN RIVER SEGMENT, HOMALIN TOWNSHIP	Severe heavy metal contamination in freshwater ecosystems and significant health risks can result from mining activities. The current study aimed to assess the seasonal variations of heavy metal concentrations (lead, cadmium, arsenic and mercury) in fishes (Wallago attu and Cirrhinus mrigala) and their environs (water and sediment), Chindwin River segment, Homalin Township, Sagaing Region. The analysis was conducted using a Flame Atomic Absorption Spectrometer at the Universities� Research Centre of the University of Yangon and the Water Quality Laboratory in Yezin, Nay Pyi Taw. The study spanned from December 2022 to November 2023. Heavy metal concentrations were found to vary depending on the seasons (hot, rainy and cold) and species. The highest concentrations of Pb were recorded in both Wallago attu and Cirrhinus mrigala during the hot season. However, the concentrations of As, Hg, and Cd in the studied fish species were recorded within the maximum permissible limits set by the World Health Organization/Food and Agriculture Organization (WHO/FAO). These findings suggest that the fish, water and sediments in the study area may not be entirely safe from toxic metal contamination. The observed values for all tested metal concentrations of studied fish species and their environments, except for water, were below the maximum permissible limits, indicating a relatively lower risk of contamination.	2025
2562	Saw Soe Moe Thu1*, May Thu Rein Oo2, Cho Cho Thin3, Kay Lwin Tun4	GROWTH PERFORMANCE OF NOTOPTERUS NOTOPTERUS (PALLAS 1769) LARVAE USING IN THREE DIFFERENT DIETS	The present work was investigated the growth performance of post-larvae Notopterus notopterus by using three different diets. A total of 300 post larvae, ranging from 2.9 cm to 3.4 cm in length and weighing between 0.02 g and 0.05 g, were divided into three groups and fed with three different live feeds: Moina, Tubifex, and Rotifer. The experiment were conducted for three triplicate. The fishes accepted all types of diets. The specific growth rate (SGR) was higher in post larvae fed on Moina (6.98�0.10%), followed by Tubifex (6.92�0.04%), with the lowest SGR was recorded for Rotifer (6.74�0.44%). The highest final mean weight and weight gain were observed in post larvae fed on Moina (2.64�0.16) g, followed by Tubifex (2.54�0.06) g, with the lowest weight gain recorded for Rotifer (2.30�0.31) g. No significant difference was observed in fish fed on Tubifex and rotifer, whereas Moina-fed larvae showed a significant difference (p < 0.05) compared to other two groups. The survival rate on day 60 was 83% for larvae fed on Moina and 82% for those fed on Rotifer, whereas the lowest survival rate of 75% was recorded for Tubifex fed larvae. Therefore, The larvae of Notopterus notopterus could be reared using different livefood to promote enhanced growth and survival rate.	2025
2563	Soe Myint Khine1, Cho Cho Thin2, Kay Lwin Tun3	SEASONAL VARIATION OF HEAVY METAL RESIDUES IN SOME FISH FROM RICE FISH FARM OF WEST TARPET VILLAGE, MAUBIN TOWNSHIP	Rice fish farming system experimental trials in Myanmar?s Ayeyarwady Delta started in 2017. Fish from rice fish farms and paddy fields are supply nourishment of local people. Bioaccumulation of heavy metals in fish causes serious threats to human when they are consumed. This study focused on the seasonal variation of heavy metal concentrations (Arsenic (As), Cadmium (Cd) and Lead (Pb) in muscle tissues of six fish species (Catla catla, Labeo rohita, Puntius gonionotous, Puntius chola, Mystus pulcher and Channa striata) cultured in the rice-fish farm and paddy fields located at West Tarpet Village, Maubin Township. Seasonal variation of metal concentrations in water and soil were also investigated separately from paddy field fish and rice-fish farm fish from June 2022 to May 2023. The levels of metal concentration varied depending on the season and the different fish species. The highest concentrations of As and Cd were found in Puntius chola and Mystus pulcher during the rainy season in paddy field. However, these values were not over the maximum permissible limit and guide line limit of WHO and FAO. The concentration of Pb in Labeo rohita was high during the rainy season and it exceeded the permissible limit. Cd and Pb concentrations in water samples were found to over the maximum permissible limit during the rainy season. The values of As concentrations in water samples were not over permissible limit in all seasons. The concentrations of As, Cd and Pb in soil sample were recorded beyond the acceptable limit. The values of heavy metal concentrations observed for all fish species except Labeo rohita, did not exceed the acceptable limits set by WHO/FAO (2011). While certain species showed elevated levels during the rainy season, all fish remained within acceptable limits set by WHO/FAO standards, highlighting the importance of ongoing environmental monitoring for sustainable aquatic ecosystems.	2025
2564	Mi Khin Sandar Win1, Aye Aye Khaing (1)2, Nyunt Nyunt Oo3	INVESTIGATION OF SOME BIOLOGICAL CONDITIONS OF JOHNIUS COITOR (HAMILTON, 1822) FROM GYAING RIVER SEGMENT BETWEEN GADOE AND KAWBEIN AREA	Amphidromous croaker Johnius coitor (Hamilton, 1822) is one of the commercially important demersal fish of the Gyaing River segment between Gadoe and Kawbein Area. The study is based on 200 samples of J.coitor (Hamilton, 1822) collected at a monthly interval for a period of 12 months (January 2022 to December 2022). The result showed that the total length of male J.coitor specimens ranged from 12.00 cm to 20.00 cm and weight from 15.00 g to 70.00 g, while the female specimen ranged from total length 14.00 cm to 20.00 cm in total length and 13.00 g to 81.00 g in total weight. The length-weight relationship values of male and female J. coitor were significantly correlated (R2 = 0.5036 and R2 = 0.551, respectively). The peak value of GSI was attained in February for males and for females in October. A gradual increase in GSI value was found during the spawning period and gradually decreased during the post-spawning and resting periods. GSI values occur in an inverse relationship to those of HSI. The condition factor (K) is (0.41-0.95) in males and (0.40-0.89) in females, which is close to (1) and could be considered an indicator of good growth and feeding conditions. The result of this study contributes information on species restoration and fishery management in the Gyaing River.	2025
2565	Thawdar Aung1, Thidar Aung2, Win Win Mar3	REQUENCY DISTRIBUTION OF MITOTIC CELL DIVISION IN DECCAN CARP, LABEO POTAIL (SYKES, 1839) AND STRIPED CATFISH, PANGASIANODON HYPOPHTHALMUS (SAUVAGE, 1878)	The deccan carp Labeo potail and striped catfish Pangasianodon hypophthalmus were obtained from Arrthit Private Fish Farm, Patheingyi Township to investigate the chromosomal configurations of mitotic cells division by treating with mitotic inhibitor during January to August 2022. The colchicine concentration 0.30 % and 0.50 % were injected into the musculature of both fishes depend on the fish weight ml/g. The various organs such as oral cells, gill filaments, liver, kidney and blood cells of these fishes were treated for durations 3 hrs, 4 hrs 30 mins, 5 hrs and 6 hrs in L. potail. However, 5 hrs, and 5 hrs 30 mins were applied in P. hypophthalmus. The hypotonic solution 0.56 % KCL was used to cell explosion. The highest frequency of interphase stage was observed in blood cells 93.97 % (n=187), kidney 94.21 % (n=114), 91.46 % (n=439), and prophase stage was also found in kidney 38.10 % (n=16) and blood cells 56.19 % (n=168) in both fishes. The most frequent distribution of metaphase stages was observed in the colchicine concentration 0.50 % for duration 4 hrs 30 mins with 0.56 % KCL for duration 1 hr in L. potail whereas 5 hrs, 5 hrs 30 mins in P. hypophthalmus with 0.56 % KCL for duration 1 hr. The most accelerated mitotic stage of cells such as interphase, prophase, metaphase, anaphase and telophase were observed. These results will provide not only the basic information of mitotic technique of cell division but also resolve the mitotic check point of the chromosomal configuration for other freshwater fishes.	2025
2566	Thidar Aye1 and Win Win Mar2	DETERMINATION OF THE AGE OF NOTOPTERUS NOTOPTERUS (PALLAS, 1769) WITH REFERENCE TO THE STRUCTURAL CONFIGURATION IN SOME CALCIFIED STRUCTURES AND SCALES	The growth performance and age determination of Notopterus notopterus from Northern Part of Meiktila Lake were investigated during December 2019 to August 2020 by using back calculated length at age and von Bertalanffy growth curve. The total length, standard length and weight of fishes were recorded. Five different calcified structures viz. scale, otolith, vertebrae, operculum and cleithrum of fishes were applied. Annuli in these calcified structures reading revealed 4 yrs, 5 yrs and 6 yrs in which operculum reading was more precise for age determination. The relevant combination of growth constants to estimating lengths from age interpretation to the nearest asymptotic length revealed performance index in female and with the growth with in male. The present results will provide the precise interpretation of aging structure of local fishes as well as to give the sense of their biological aspect in aquaculture.	2025
2567	Me Me Thein1 and Thant Zin2	CHROMOSOMAL INVESTIGATIONS ON CYPRINUS CARPIO LINNAEUS, 1758 AND LABEO ROHITA (HAMILTON, 1822) FROM MONDAING DAM, MEIKTILA TOWNSHIP, MANDALAY REGION	The present research was conducted to study chromosomal variations and karyogram of Cyprinus carpio and Labeo rohita from Mondaing Dam, Meiktila Township, Mandalay Region. The study period lasted from July 2022 to January 2023. For chromosome preparation, 0.5 ml of blood sample was extracted from the caudal vasculature of selected specimens and mixed with 0.5% colchicine 0.5 ml and 100% sodium chloride (hypotonic solution) 1 ml. Then, tested for different durations of 1 hour 30 minutes, 1 hour 45 minutes, 2 hours, 2 hours 15 minutes, 2 hours 30 minutes and 2 hours 45 minutes and stained with undiluted Giemsa for 15 minutes. Finally, the two slides of the treated cell suspensions were fixed in two or three drops of Carnoy�s fixative solution. The optimum metaphase spreads were observed at 2 hours and 15 minutes in C. carpio and 2 hours and 30 minutes and 2 hours and 45 minutes in L. rohita. The karyotype results of two fish species indicated that the diploid number of C. carpio was 2n = 100 with 28 metacentric (m), 38 submetacentric (sm), 12 acrocentric (a) and 22 telocentric (te) chromosomes with the number of fundamental arms was 166. The diploid number of L. rohita was 2n = 50 with 16 metacentric (m), 14 submetacentric (sm), 12 acrocentric (a) and 8 telocentric (te) chromosomes with the number of fundamental arms was 82.	2025
2568	Win Ei Khaing1, Daw Maw2, Hnin Hnin Wai3	PREVALENCE OF SOME INSECT SPECIES ON THE PLANTATIONS OF MAIZE (ZEA MAYS L., 1753) IN MIN HLA TOWNSHIP,MAGWAY REGION	Maize is among the world�s three most important cereal crops. It is Myanmar�s second most important crop with more than one million acres planted annually. A total number of (3210) individuals was accounted for 18 species of insects, distributed among 17 genera 14 families, and six orders, and collected from maize plantations, Min Hla Township, Magway Region from January to December 2022. Among the recorded species, 13 species were identified as pests and the other five species as beneficial or predatory insects. In the present study, the maximum number of species recorded in order Hemiptera was represented by five species (33.33%) while, the minimum number of species Orthoptera, Neuroptera, and Hymenoptera recorded only one species (6.67%) respectively from study site I (Malun Village). In study site II (Pan Taw Pyin Village) the maximum number of species recorded in order Hemiptera was represented by seven species (38.88%), while the minimum number of species in Orthoptera, Neuroptera, and Hymenoptera recorded only one species (5.56%) respectively. In study site I, the maximum number of individuals was recorded in the order Lepidoptera represented by (739) individuals (51.71%), while the minimum number of individuals in Orthoptera (21) individuals (1.47%) were recorded during the study period. The maximum numbers of individuals were collected in order Lepidoptera was represented by (815) individuals (45.76%), the minimum number of individuals were collected in Orthoptera (8) individuals (0.45%) were recorded in study site II. During the study period, Lepidopterans species are predominant on maize plantations in two study sites.	2025
2569	Khin Mar Lwin1, Khine Mi Mi Zaw2, Khin Mi Mi Oo3	PREVALENCE AND HISTOLOGICAL CHANGES OF MYXOSPOREAN PARASITES IN THE KIDNEYS OF CIRRHINUS MRIGALA, LABEO ROHITA AND LABEO CATLA (HALMILTON, 1822) FROM ALONE FISH CULTURE POND, MONYWA TOWNSHIP	Myxosporean parasites were important disease in culture fish species due to decrease fish production. Myxosporean infection in the kidney of three carp species, Labeo rohita, Cirrhinus mrigala and Gibelion catla was conducted from Alone fish culture pond, Monywa Township from June 2019 to May 2020. Amounted to 14 species of myxosporean parasites were observed. The total 90 fish specimens of three carp species, Cirrhinus mrigala, Labeo rohita, and Gibelion catla were studied for the prevalence of myxosporean parasites and histological changes in the kidneys of these species. Seven species of Myxobolus, and one species of Thelohanellus in Cirrhinus mrigala, three species of Myxobolus and one species of Thelohanellus in Labeo rohita and two species of Myxobolus in Gibelion catla were observed. The prevalence of myxosporean parasites of three carp species, Cirrhinus mrigala, Labeo rohita and Gibelion catla were found 83.33 %, 53.33 % and 13.33 % respectively. Histological changes were studied in infected kidneys of three carps, the large amount of matured myxosporean parasites were observed in the epithelial cells of renal tubules, in the blood corpuscle, and glomerulus of kidney. Among these three carp species, Cirrhinus mrigala was infected by more diverse species of myxosporean parasites and appeared more susceptible than the other two carps.	2025
2570	Myo Myo1 and Win Win Mar2	MORPHO-MERISTIC CHARACTERIZATION AND KARYOMORPHOLOGICAL VARIATIONS IN CHANNA PUNCTATA (BLOCH, 1793) FROM MEIKTILA LAKE, MEIKTILA, MANDALAY REGION	Assessment on the variations of morpho-meristic and cytotaxonomic characteristics due to the variation of karyo-morphology in some Channa punctata from Meiktila Lake, Mandalay Region was conducted during July 2022 to January 2023. Blood samples were treated using 0.50 % colchicine solution and incubated with the saturated NaCl for various durations: 1 hr 15 mins, 1 hr 30 mins, 1 hr 45 mins, 2 hrs, 2 hrs 15 mins, 2 hrs 30 mins, 2 hrs 45 mins, 3 hrs, 3 hrs 15 mins and 3 hrs 30 mins, respectively. A drop of each sample was put onto the slide and stained with undiluted Giemsa stain. The best optimal checkpoint for metaphase chromosomes was at 2 hrs 30 mins and were not clearly discerned on morphometric changes. Model numbers of metaphase chromosomes were octaploidy 2n = 8X = 128 having 3 submetacentric (sm) + 6 acrocentric (ac) + 7 telocentric (t) with fundamental arm number (NF = 304). Thus, C. punctata from Meiktila lake possess the diverged karyotypic patterns indicating that they are asymmetric species and can be used as cytogenetic marker for their population.	2025

Research Publications

Myanmar Academy of Art & Science List of Research