Bangladesh Journal of Zoology 2021-04-11T03:39:18+00:00 Professor Dr. Md. Niamul Naser Open Journal Systems <p>Bangladesh Journal of Zoology is an official scientific journal of the Zoological Society of Bangladesh published twice annually in June and December in English. Full Text articles now available.</p> Tribute to Father Dr Richard William Timm, CSC (1923- 2020): First Editor of the Bangladesh Journal Of Zoology 2021-04-11T03:38:40+00:00 M Niamul Naser <p>Abstract not available</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 213-214, 2020</p> 2021-04-11T01:18:56+00:00 ##submission.copyrightStatement## Ichthyodiversity of the five linked rivers of Chattogram, Bangladesh 2021-04-11T03:38:41+00:00 MA Azadi Mohammad Arshad Ul Alam <p>Faunal records are essential to understand, manage and conserve any ecosystem if altered due to anthropogenic or natural causes. In the south eastern Bangladesh five linked rivers, Karnaphuli, Halda, Sikalbaha, Chandkhali and Sangu play a significant role in the country‟s fisheries sector. In this study ichthyofauna of the three linked rivers, Karnaphuli, Shikalbaha and Chandkhali are presented. From these three important linked rivers a total of 130 ichthyofaunal species, of which 112 finfish and 18 shellfish species were recorded during May 2010 to February 2020. Out of 130 species of finfish and shellfish, 128 species (110 fin and 18 shell fish) from the River Karnaphuli, 85 species (74 fin and 11 shell fish) from the River Shikalbaha and 83 species (72 fin and 11 shell fish) from the River Chandkhali were recorded. A total of 112 finfish species including four exotics belonged to 20 orders, 47 families, and 90 genera and 18 shellfish species were under one order, 3 families and 7 genera. Maximum finfish and shellfish species were under the families Cyprinidae (22 species) and Palaemonidae (9). Amongst the 112 finfish, one was critically endangered, six endangered and eleven was vulnerable. Systematic list of the ichthyofauna with local names is given. Status of local availability of species along with those reported as data deficient and not reported by IUCN (2015) are also provided. This study will help the fishery scientists, policy makers and planners to manage and conserve the fish faunal diversity in the three important linked rivers of Chattogram.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 215-230, 2020</p> 2021-04-11T01:19:00+00:00 ##submission.copyrightStatement## Population dynamics and stock assessment of Hilsa shad, Tenualosa ilisha (Hamilton, 1822) along the coast of Bangladesh 2021-04-11T03:38:44+00:00 Md Khairul Islam - Md Humayun Manmatha Nath Sarker - Md Sharifuddin M Niamul Naser <p>Stock Assessment of <em>Tenualosa ilisha </em>(Hamilton, 1822) were estimated using FiSAT-II software with length-frequency data collected from different landing centers. The Southeast Coast of Bay Of Bengal, Cox's Bazar. The Von Bertalanffy growth parameters Land K for the species were asymptotic length (L∞) was 51.41 cm, growth rate (K) was 0.75 year<sup>-1</sup> and t0 = -0.2 year respectively. The estimated value of total mortality (Z) based on length converted catch curve using these growth parameters was 2.35 year-1.Natural mortality (M) based on growth parameters and mean environmental temperature (T = 27° C) was 1.00 year-1 and fishing mortality (F) was 1.35 year<sup>-1</sup>. Optimum length of hilsa at first capture (Lc=L50) was 28.36 cm TL. Growth performance indices (ϕ') was 3.30. The estimated value of the exploitation rate (E) using the length-converted catch curve was 0.57. The recruitment pattern of this species was continuous and two peaks per year. The present investigation clearly showed the over fishing (E &gt; 0.50) condition for <em>T. ilisha </em>in Bangladesh. The estimated length-weight relationship for the combined sex was found to be W = 0.0109 L<sub>3</sub>. Virtual population analysis (VPA) showed that the maximum fishing mortality occurring in the length between 30 to 35 cm with a maximum value in the length of 32 cm that repeatedly indicate high fishing mortality in the <em>T. ilisha</em>. The generalized length-weight relationship was fitted with the pooled data of all monthly samples were BW = 0.029 TL2.718 (R2= 0.833) respectively. The results revealed that all length-weight relationships were highly correlated (r &gt; 0.993). Maximum sustainable yield (MSY) was estimated as 435,554 t.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 231-241, 2020</p> 2021-04-11T01:19:37+00:00 ##submission.copyrightStatement## Using parasites as biological tag for Hilsa shad (Tenualosa ilisha) migration in Bangladesh waters 2021-04-11T03:38:48+00:00 Md Aminul Islam Bhuiyan Zannatun Nahar Jhinu <p>The study was aimed at following the movement of adolescent <em>Tenualosa ilisha </em>from nursery grounds to feeding and spawning grounds or other type of movements in Bangladesh waters. To accomplish this, data on metazoan endoparasites were used as biological tags for detection of migratory route. A total of 2667 host fishes were collected from eleven sites covering the three different ecological habitats of Bangladesh. Initial selection of parasites as biological tags was executed by using established criteria, primarily on the basis of different level of infection in different habitats. The role of incidental parasites as tags is also discussed. Overall fourteen species under eleven genus of endohelminths were identified from alimentary canal and associated organs of host, only three species of them had satisfied the criteria of being as biological tag. These are cestode parasite <em>Ilisha parthenogenetica </em>and acanthocephalan parasite <em>Acanthosentis indica </em>and <em>Acanthosentis hilsai</em>. Higher prevalence of these parasites at respective sites and the trend of prevalence of infection in size class of host fish demonstrated host‟s anadromous nature and reinforced the belief that the <em>T. ilisha </em>as a whole, migrates from the sea to the rivers via the estuaries and vice versa.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 243-251, 2020</p> 2021-04-11T01:19:49+00:00 ##submission.copyrightStatement## Twelve new records of Coral associated fish from the Saint Martin’s island based on morphometric and molecular approaches 2021-04-11T03:38:49+00:00 Mst Mashruba Naznin Mohammad Abdul Baki Md Muzammel Hossain Sujan Kumar Datta Md Sagir Ahmed <p>The study was conducted to know the diversity of coral associated fishes of the Saint Martin Island from December 2017 to April 2019. A total of 46 coral associated marine fish species were recorded, among them 12 species; <em>sunajtuLiughcliug </em><em>, Lutjanus russellii, Parupeneus indicus, Siganus sutor, Thalassoma lunare, Gazza achlamys, Pomadasys andamanensis, Pomadasys kaakan, Lethrinus crocineus, Argyrosomus regius, Istigobius ornatus and Cryptocentrus cyanotaenia </em>under six family were newly recorded from this Island. We assume that there are more species to be explored and need proper management strategy for conservation of coral reef and its associated biodiversity.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 253-262, 2020</p> 2021-04-11T01:20:35+00:00 ##submission.copyrightStatement## First distributional record of sixteen Coral associated fish species from Saint Martin’s island, Bangladesh 2021-04-11T03:38:51+00:00 Shilpi Saha - Shamsunnahar Subrina Sehrin Anirban Sarker Kazi Ahsan Habib Mohammad Abdul Baki <p>The Bangladeshi reef fish species have not been studied thoroughly. An attempt has been made for taxonomic identification of coral-associated fish through morphological studies. Mostly dead and few live fishes were collected from local fishermen, fish landing zone, and fish markets in St. Martin’s Island, Bay of Bengal, Bangladesh, from October 2015 to July 2016, visiting seven times. Samples were also obtained from local boys who collected fishes by using hook and line. The study recorded the first occurrence of 16 coral-associated fish species such as <em>Caesio cuning</em>, <em>Lethrinus ornatus</em>, <em>Upeneus suahelicus</em>, <em>Upeneus asymmetricus</em>, <em>Scarus taeniopterus</em>, <em>Scarus zufar</em>, <em>Bodianus neilli</em>, <em>Parapercis clathrata</em>, <em>Parapercis diplospilus</em>, <em>Pomadasys furcatus</em>, <em>Siganus fuscescens</em>, <em>Acanthopagrus berda</em>, <em>Gerres erythrourus, Lagocephalus spadiceus</em>, <em>Psettodes bennettii</em>, and <em>Heteroconger perissodon</em>. Among them, <em>Parapercis clathrata</em>, <em>Parapercis diplospilus </em>belongs to the family Pinguipedidae before, no species was recorded under this family from Bangladesh and a rare and endemic species, <em>Scarus zufar</em>, of the Arabian Sea off Dhofar (Zufar), Oman in the Western Indian Ocean, was recorded for the first time in the Northern Indian Ocean in the northeastern part of Bay of Bengal. This study increased the number of coral-associated fish from 240 to 256 species and the number of families from 54 to 55 in the coral reef ecosystem of the Bay of Bengal, Bangladesh.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 263-288, 2020</p> 2021-04-11T01:21:12+00:00 ##submission.copyrightStatement## Diversity and population density of birds at the Jahangirnagar University campus, Bangladesh 2021-04-11T03:38:53+00:00 Delip K Das Mohammad Mostafa Feeroz Sajeda Begum <p>Rapid urbanization is changing the habitats of many wildlife species. Even so, certain species appear to adapt and now have thriving populations within cities. To look at the capacity for these spaces to provide “habitat” we examined population density of bird species using Jahangirnagar University campus close to the Dhaka mega city, Bangladesh. Four strip transects were surveyed from March 2008 to February 2009 (12 times/transect). A total of 101 species were found along the transect areas. The density of Lesser Whistling Duck (<em>Dendrocygna javanica</em>) was the highest 107.02indiv. /ha while Large-tailed Nightjar (<em>Caprimulgus macrurus</em>) was the lowest 0.01indiv. /ha among resident birds of Jahangirnagar University campus. Among the migratory birds, the density of Pintail Snipe (<em>Gallinago stenura) </em>and Common Stonechat (<em>Saxicola torquata</em>) were the highest (1.99indiv. /ha.) and the lowest (0.02indiv. /ha.), of the different available habitats, water bodies contained the highest density (318.59indiv. /ha) and grassland contained the lowest (2.48indiv./ha) of bird population. The percentage of average density of non-passerine and passerine birds was 65% and 35%, respectively. Future studies of avian composition and density is recommended at a regular interval to understand changes in the carrying capacity and avian community of the campus as a function of altering habitat due urbanization.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 289-300, 2020</p> 2021-04-11T02:09:50+00:00 ##submission.copyrightStatement## Maximum Sustainable Yield for the Passur river fishery of Bangladesh by using Surplus-production model 2021-04-11T03:38:55+00:00 Muhammad Abdur Rouf Sheik Istiak Md Shahriar Md Hafizur Rahman Md Mehedi Hasan Al Hasan Antu Md Noman Siddiqui <p>Maximum sustainable yield (MSY), fishing effort (<em>f</em><em>msy</em>) and total allowable catch (TAC) of major fishery in the Passur River, Bangladesh were estimated using surplus production model (Schaefer and Fox model) with observation-error estimator based on four years (2011-2014) catch and effort data. Fox model was especially highlighted in this study; the estimated value of MSY was 4.61 kg with corresponding <em>f</em><em>msy </em>of 13.51 units (200m2SBN/day). Moreover, the mean value of MSY and TAC with 95% confidence interval in stochastic method was 4.53 kg and 4.08 kg respectively with the 13.22 units of fishing effort (<em>f</em><em>msy</em>). The overall results provide clear evidence that the fishery of the Passur River is being overexploited in the months from December to March. Sustainable exploitation of this stock can be assured through reducing present fishing effort. In addition, TAC might be incorporated along with several existing fisheries management measures to ensure the compensation of this stock towards long term sustainability.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 301-312, 2020</p> 2021-04-11T02:09:59+00:00 ##submission.copyrightStatement## Occurrence of Strongyloides stercoralis in rural areas adjacent to Dhaka city 2021-04-11T03:38:56+00:00 Laila Fahria Aleya Begum Mandira Mukutmoni <p>The present study was designed to investigate <em>Strongyloides stercoralis </em>infection in rural communities of Savar and Gazipur. A total of 160 stool samples were collected from the inhabitants of the study areas during December 2016 to November 2017. The samples were processed by direct smear, formol-ether concentration technique and Harada-Mori culture. The overall prevalence of <em>S. stercoralis </em>was 10.63%; 11% in Savar and 10% in Gazipur. The elderly people were more prone to <em>S. stercoralis </em>infection. No respondent belonging to age group of 11-20 years was found positive for infection. Poor educational status, inferior financial condition and inadequate hygiene practice were found as potential risk factors (P&lt;0.05). Noticeable prevalence was observed among the respondents living in mud floored house (13.46%), irregular nail clippers (22.73%), bare footers (14.89%) and laborers (27.27%) in Savar. Prevalence was high among the respondents deprived of institutional education (17.86%) in Gazipur.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 313-320, 2020</p> 2021-04-11T02:10:09+00:00 ##submission.copyrightStatement## Comparative nesting patterns and success of Mynas and Starlings (Aves: Sturnidae) inhabiting Jahangirnagar University campus, Bangladesh 2021-04-11T03:38:58+00:00 Shamia Farhana Shoma Sajeda Begum <p>Nesting patterns of four species of mynas and starlings, Common Myna (<em>Acridotheres tristis</em>), Jungle Myna (<em>Acridotheres fuscus</em>), the Asian-pied Starling (<em>Gracupica contra</em>) and Chestnut-tailed Mtarling (<em>Sturnia malabarica</em>) were studied in Jahangirnagar University campus from March to September in 2016. Nests were searched systematically throughout the study area and nesting parameters like nest dimensions, nest-site selection, tree species preference, nesting materials, clutch size and nesting success were examined. A total of 101 nests were recorded where 31 nests were of Common Myna, 10 of Jungle Myna, 49 of the Asian-pied Starling and 11 nests were of Chestnut-tailed Starling. Overall, the sturnids preferred nesting on trees (n=84) to anthropogenic structures (n=17). Common myna showed maximum variation in nest-site selection using tree holes (n=12), tree branches (n=10) and building cornices, holes or crevices (n=9) whereas Chestnut-tailed Starling nested only in tree cavities (n=11). Jungle Myna built nests both in tree holes (n=4) and in building holes and crevices (n=6). The Asian-pied Starlings built their domed nests mostly on tree branches (n=47) where 69% nests were peripheral and 31% were central in position. Out of 20 species of trees utilized for nesting purpose, the majority of nests were built on Whites iris <em>Albizia procera </em>(n=18) followed by Neem <em>Azadirachta indica </em>(n=10) and Mahogany <em>Swietenia mahagoni </em>(n=10). The nests were constructed between 2 and 18m (8±3.8m) from the ground level. Among 19 types of nesting materials recorded, twigs, leaves, straws, grasses, feathers, plastics and polythene were frequently used by all four species while the Asian-pied starling used more rubbish materials than other species. Highest nesting success (80%) was recorded in Common Myna whereas the Asian-pied Starling, Chestnut-tailed Starling and Jungle Myna had 77.8%, 75% and 66.7% of nesting success respectively. Adaptions to using different nesting sites in Common Myna and comparatively higher nesting height in the Asian-pied Starling may have facilitated the greater nesting success.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 321-334, 2020</p> 2021-04-11T02:10:22+00:00 ##submission.copyrightStatement## Surveillance of Escherichia coli in a fish farm of Sylhet, Bangladesh 2021-04-11T03:39:00+00:00 Rizoneul Haq Reza Shahena Aktar Shipa M Niamul Naser Md Faruque Miah <p>The study was accomplished to investigate <em>Escherichia coli </em>from two freshwater fish, Tilapia (<em>Oreochromis niloticus</em>) and Mrigal (<em>Cirrhinus mrigala</em>), collected from a fish farm in Sylhet, Bangladesh. Six of each fish were analyzed to isolate and detect <em>Escherichia coli</em>, and <em>E. coli </em>was identified based on morphological and biochemical characteristics. The antibiogram of <em>E. coli </em>was investigated in different generations using eight antibiotic discs such as Chloramphenicol (CH), Streptomycin (S), Gentamycin (G), Ciprofloxacin (CI), Co-trimethoxazole (CO), Azithromycin (AZI), Erythromycin (E) and Novobiocin (NV), and the sensitivity of <em>E. coli </em>was found as 100%, 25%, 100%, 75%, 87.5%, 81.25%, 0%, 0% respectively. Among the 8 antibiotics, for Erythromycin (E) and Novobiocin (NV), the observed resistance pattern of <em>E. coli </em>was 81.25% and 87.5% respectively, whereas, for the rest of the antibiotics, it was 0%.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 335-346, 2020</p> 2021-04-11T02:10:33+00:00 ##submission.copyrightStatement## Urinary tract infection among the outpatients of a diagnostic center in Dhaka, Bangladesh 2021-04-11T03:39:02+00:00 Sonia Rustom Rimi Farhana Zaman Priyanka Barua Hamida Khanum <p>Urinary tract infection (UTI) is one of the common bacterial infections occurring in the community and in hospitals of Bangladesh. A total of 300 urine samples were tested for UTI among which 100 were from children (age 1-15 years), 100 from adult female (16-75 years) and 100 from adult male (16-75 years). Out of 300, 126 samples were found positive for UTI (42%). The highest prevalence was observed among adult female (64%) followed by male and children (31% each). According to age groups, the highest prevalence was observed in female aged 16-35 years (70.73%) followed by female of 36-55 years (62.5%) and 56-75 years (52.63%). The highest prevalence for children was observed in age group 11-15 years (33.33%) and for adult male, it was 16-35 years (34.88%). The highest prevalence for adult female and male was observed in summer (66.67% and 38% respectively). The current study confirmed that Bangladeshi women and children are more vulnerable to UTI than Bangladeshi men. Regardless of age, women were more prone to UTI and the prevalence was highest in summer.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 347-356, 2020</p> 2021-04-11T02:10:43+00:00 ##submission.copyrightStatement## Seasonal dynamics of bean aphids and its relationship with the abundance of Lady Bird Beetles 2021-04-11T03:39:03+00:00 Mohsen Ara Sharmin Md Ruhul Amin Md Ramiz Uddin Miah Abdul Mannan Akanda <p>The seasonal dynamics of aphid <em>Aphis craccivora </em>Koch (Hemiptera: Aphididae) on four bean species namely country bean <em>Lablab purpureus</em>, yard long bean <em>Vigna sesquipedalis</em>, hyacinth bean <em>Dolichos lablab </em>and bush bean <em>Phaseolus vulgaris </em>were studied from September to December 2017 in the experimental field of the Department of Entomology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh. The study also investigated the relationship between the abundance of aphid and its predatory insect lady bird beetle. Aphid abundance on the bean species showed increasing trend from the 4th week of September and reached to the peak during the 2nd week of November and then declined. Bush bean and yard long bean, respectively depicted the higher and lower abundances of aphid throughout the study. Relationship between the abundance of aphid and lady bird beetle on the bean species were positively correlated. Aphid showed negatively correlation with temperature and rainfall, and positive correlation with relative humidity, and the correlations were not significant. Multiple regression equation showed that temperature had the highest effect which contributed 16.1 - 19.2% role on the population of aphid.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 357-363, 2020</p> 2021-04-11T03:01:50+00:00 ##submission.copyrightStatement## Proximate composition, amino acids and fatty acids profiles of wild and cultured Climbing Perch, Anabas testudineus (Bloch, 1795) 2021-04-11T03:39:05+00:00 Mst Taslima Akter Md Hasan Faruque Md Rakibul Hasan Mohammad Shamsur Rahman <p>The availability and compositions of foods in the aquatic system have a direct influence on nutritional compositions of fish muscle. This research aimed to determine the nutritional compositions of wild and cultured climbing perch, <em>Anabas testudineus, </em>between pre-monsoon and post-monsoon. The proximate compositions, total amino acid, and fatty acid profiles were determined by AOAC, HPLC and GC, respectively. The results in dicated that proximate (e.g., moisture, ash, protein and lipid), amino acid and fatty acid profile varied significantly (<em>p</em>&lt;0.05) between wild and cultured fishes depend on season. The highest amount of moisture (79.62±0.92%) was found in wild <em>A. testudineus </em>and lowest amount of ash (2.50±0.09%) was found in cultured <em>A. testudineus </em>during pre-monsoon. For both cultured and wild <em>A. testudineus, </em>amount of protein was higher in post-monsoon than in pre-monsoon period. The protein and amino acids contents as well as lipid and fatty acids of the fish species showed a significant (<em>p</em>&lt;0.05) seasonal variations. Among the 14 recorded amino acidsthe major amino acids in the total crude protein were histidine, methionine, isoleucine, lysine, glutamic acid, and glycine. The ratio of Essential Amino Acid (EA)/Non-Essential Amino Acid (NEA) was highest (0.34) in cultured fish of post-monsoon season and lowest (0.25) in wild fish of pre-monsoon season. The major fatty acid so wild and cultured <em>A. testudineus </em>were oleic acid (18:1), palmitic acid (16:0), linoleic acid (18:2), stearic acid (18:0), palmitoleic acid (16:1<em>), and</em>myristic acid (14:0).Some fatty acids [Lauric acid (C12:0), Pentad cyclic acid (C15:0), Arachidic acid (C20:0)]were not detected in cultured fish but present in wild fish. The n-3/n-6 ratio was highest (0.48) in wild fish of post-monsoon season and lowest (0.14) in cultured fish of pre-monsoon season. Therefore, a comprehensive study on wild and cultured climbing perch is required for further confirmation of the result of the present study.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 365-378, 2020</p> 2021-04-11T03:02:00+00:00 ##submission.copyrightStatement## Toxicological effect and behavioral response of a predatory Stinging Catfish, Heteropneustes fossilis exposed to three indigenous plant seed extracts 2021-04-11T03:39:07+00:00 Sadia Sultana Munira Nasiruddin MA Azadi MR Chowdhury <p>For the removal of undesired fish species from aquaculture ponds, an alternative to synthetic toxins is the use of botanical toxicants which are biodegradable and environmentally safer. Toxicological effects of distilled water, 50% ethyl alcohol, methanol and acetone extracts of three indigenous plant seeds, <em>Jatropha carcus </em>(Linn.), <em>Hydnocarpus wightianus </em>(Blume) and <em>Aleurites moluccana </em>(Linn. Willd) were studied on the predatory fish, <em>Heteropneustes fossilis </em>(Bloch) under normal laboratory conditions. Depending upon the type of plants, extracts and concentrations, percentage mortality varied. Behavioral activities increased with increasing concentrations. During exposure, fish exhibited discolouration, gulping for air, erratic swimming, loss of reflex, slow movement and ultimately became motionless before death . The extent of toxicity of extracts for <em>J. carcus, H. wightianus </em>and <em>A. moluccana </em>on <em>H. fossilis </em>could be ranked in the order: Acetone &gt; methanol &gt; 50% ethyl alcohol &gt; distilled water. On the basis of LC50 values the most toxic was acetone extract of <em>J. carcus </em>seeds and least toxic was distilled water extract of <em>A. moluccana </em>seeds. It is suggested that these plant seed extracts would be helpful in aquaculture to remove unwanted fish species from culture ponds.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 379-391, 2020</p> 2021-04-11T03:02:13+00:00 ##submission.copyrightStatement## Comparative study on Headless Shell-On (HLSO) Black Tiger Shrimp (Penaeus monodon) processing under on board and land based factory facilities 2021-04-11T03:39:09+00:00 S Ahmed MH Uddin SM Istiak <p>Shrimps is one of the main export commodities of the country and earns about more than 40 crores 47 lac US $in 2017. Black Tiger (BT) shrimp alone contributes about 67 % to the total shrimp export per year. Aquaculture shrimps are being processed in the land-based processing plant while wild catch is being processed onboard (fishing vessels) in the Bay of Bengal. A study was conducted to compare the yield and economic loss/gain of headless shell-on (HLSO) shrimp during processing by labor and crews at onboard (sea) and land based (land) factories. A total of twelve samples were examined; six for land and six for sea that was designated as “P” and “V”, respectively. After beheading to produce HLSO, individual shrimp weight was measured. The average weight of an individual BT was 50.25 ± 4.174 g for V and 51.13 ±3.66 g for P. Average yield from individual shrimp was 1.19 g higher in P compared to V. Found 23.10 g less production from 1 kg BT in V compare to P which is statistically significant (P=0.057). Our estimated results indicated that one vessel got 649.89 Kg less product valued BDT 1,381,016 compare to land based processing plants due to processing by crews on board. Whole scenario predicts that more economic loss if we consider for 37 shrimp trawlers in operation.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 393-398, 2020</p> 2021-04-11T03:02:27+00:00 ##submission.copyrightStatement## Diagnosis of three Pumkin Leaf Beetle (Aulacophora spp.: Chrysomelidae; Coleoptera) pests through mtDNA-COI barcode molecular approach 2021-04-11T03:39:10+00:00 Sumita Rani Das Jannatul Ferdous Tithi Susmita Sarker Faria Farhana Rain Abu Faiz Md Aslam <p>Pest management relies on proper identification of insect species, which usually depends on morphological keys. In this research, DNA barcoding was used to identify three pest species of genus <em>Aulacophora </em>(<em>A. foveicollis</em>, <em>A. lewisii </em>and <em>A. indica</em>) attacking horticultural crops in Bangladesh. Accurate phylogenetic information and evolutionary divergence data were supported and evidenced by various parameters, including the rates of substitution, nucleotide composition and genetic divergence. The nucleotide composition of these three species indicates that the total adenine and thiamine content (A+T, 67.3%) was higher than the guanine and cytosine content (G+C, 32.87%). Intraspecific genetic divergence ranged from 0.0158-0.1415. To confirm the origin and evolution, phylogenetic tree and haplotype network was drawn. Both the maximum likelihood and neighbor joining analyses showed that <em>A. indica </em>and <em>A. foveicollis </em>were clustered in one group, and <em>A. lewisii </em>was originated from another group. Haplotype showed that <em>A. lewisii </em>has the highest amount of mutational steps among the sequenced pests and genetically distant species from its common ancestors by 78 mutational numbers. Present investigation can be reliably treated for developing reference libraries for species identification via sequence matches and designing specific pest management approach.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 399-411, 2020</p> 2021-04-11T03:02:33+00:00 ##submission.copyrightStatement## Butterfly diversity in the three selected areas in Dhaka city, Bangladesh 2021-04-11T03:39:12+00:00 Md Aminul Islam Md Abul Kashem Md Abdul Alim Fatema Tuz Zohora <p>The diversity of butterfly species was studied from January to June 2015 in the three selected areas, viz. Ramna Park, Jagannath University Campus, and Baldha Garden in Dhaka city, Bangladesh. A total 75 species of butterfly belonging to 42 genera under 8 families were recorded from the study areas during the study period. Of them, 52 species (6253 individuals) of 8 families were found in the Ramna Park, 37 species (1430 individuals) of 7 families in the Jagannath University Campus and 20 species (320 individuals) of 6 families in the Boldha Garden. In these three study areas, 17 species, 14 genera and 6 families were in common. At the Ramna Park, the highest species richness included the family Lycaenidae (21.15%, 11 spp.) followed by Papilionidae (17.31%, 9 spp.), Pieridae (17.31%, 9 spp.), Nymphalidae (17.31%, 9 spp.), Hesperiidae (13.46%, 7 spp.), Danaidae (7.69%, 4 spp.), Satyridae (3.85%, 2 spp.), and the lowest was in the family Acriidae (1.92%, 1 spp.). At the Jagannath University Campus the highest number of species were recorded in the family Lycaenidae (21.62%, 8 spp.) and Hesperiidae (21.62%, 8 spp.) followed by Pieridae (18.92%, 7 spp.), Papilionidae (13.51%, 5 spp.), Nymphalidae (10.81%, 4 spp.), Danaidae (10.81%, 4 spp.), and the lowest was in Satyridae (2.70%, 1 spp.). The topmost butterfly species were recorded in the family Pieridae (25%, 5 spp.) followed by Lycaenidae (20%, 4 spp.), Nymphalidae (20%, 4 spp.), Papilionidae (15%, 3 spp.), and the lowest from the family Hesperiidae (10%, 2 spp.) and Danaidae (10%, 2 spp.) at the Baldha Garden. The maximum butterfly species were found in February to June (51 spp.), February (34 spp.), and April (16 spp.), and the lowest were in January (46 spp.), June (21 spp.) and January (8 spp.), respectively for the Ramna Park, Jagannath University Campus and the Baldha Garden. The peak of the population observed in May (n =1285), March (n = 325), and May (n = 71), and the lowest was in January (n = 662), June (n = 145) and January (n = 21), respectively for the Ramna Park, Jagannath University Campus, and Baldha Garden. The Shanon’s Diversity Index (H) and Simpson’s Index (λ) indicated high butterfly diversity at the Ramna Park (H = 3.68, λ = 0.03), Jagannath University Campus (H = 3.20, λ = 0.06) and Baldha Garden (H = 2.50, λ = 0.13), respectively. The high Species Evenness in the Ramna Park (E = 0.93), Jaganath University Campus (E = 0.89) and the Baldha Garden (E = 0.84) indicated that the species were evenly distributed. The calculated Sorenson’s Coefficient (CC) was 0.47, which indicates that these three communities have quite a bit of overlap or similarity.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 413-428, 2020</p> 2021-04-11T03:02:42+00:00 ##submission.copyrightStatement## Molecular identification and life cycle of Black Soldier fly (Hermetia illucens) in laboratory 2021-04-11T03:39:14+00:00 Lailatul Ferdousi Nahid Sultana MA Al Helal Nasima Momtaz <p>Molecular identification and life cycle of the Black Soldier Fly (BSF), <em>Hermetia illucens </em>were carried out from the Bangladesh bio-geographical area. The sequencing result and phylogenetic analysis of BSF showed 99-100% similarity with <em>H. illucens </em>from GenBank. The average duration of life cycle of male and female were 45.08±4.46d and 46.15± 4.12d respectively. The adult female is 16.3±0.91mm long, whereas the adult male is 14.30±0.19 mm long and smaller than female. The number of eggs per clutch was 537.37±40.21 which hatched in 4.36±0.24 days. The mean duration of the developmental stages were 16.07±2.59, 15.4±2.50, 9.95±1.48 and 10.33±1.89 d for larva, pupa, male and female respectively, when cultured at 29.40±1.77° C, RH 68.25±2.32 %, 14:10 (L: D) photoperiod. The mature larval weight (0.20±0.03 g) was highest among other developmental stages.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 429-440, 2020</p> 2021-04-11T03:30:56+00:00 ##submission.copyrightStatement## Diversity, status and habitat usage of avifauna at sadar upazila, magura, Bangladesh 2021-04-11T03:39:16+00:00 Ashikur Rahman Shome Md Mahabub Alam Md Fazle Rabbe Mohammad Mijanur Rahman Mohammad Firoj Jaman <p>A study on diversity, status, and habitat preference of avifauna was conducted from November 2017 to October 2018 in Magura Sadar upazila, Magura. Data was collected through direct field observations using line-transect method. Field surveys were made for three days per month in both rural and urban sites. A total of 140 species of birds belonged to 18 orders and 48 families were reported. Among the total species, 55% (77 species) were non-passerines and 45% (63 species) passerines with the highest individuals were counted under order Passeriformes. Resident bird species were dominant (106 species, 75.71%) over migratory (34 species, 24.28%) species. Species richness was the highest in the rural areas (124 species, 88.57%) and occurrence was the highest in winter season (97 species, 69.29%). The maximum species were recorded from trees (87 species, 62.14%) as preferred habitat. In this study, in total 4,060 individuals of birds were counted and among them, 51.55% (n=2093) were observed in the rural areas and 48.45% (n=1967) were in the urban areas. The highest number of birds was found in December (10.34%, n=432) and seasonal abundance was the highest in winter (40.15%, n=1630). Abundance was the highest for Common Myna (5.76%, n=234) among all recorded species. Diversity indices showed that the bird species were the most diverse in the rural areas in the winter season and in July. Habitat diversity indices were the highest for trees and birds used different types of habitats at different times for roosting, breeding and feeding. Regarding the observation status, 29.28% species was very common, 4.28% common, 31.42% fairly common, and 35% were few. This baseline data indicate that this study site is significant from the ecological and conservation point of views. Therefore, further research is necessary to understand how this avian diversity is maintained in this ecological setting.</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 441-456, 2020</p> 2021-03-14T00:00:00+00:00 ##submission.copyrightStatement## Brief commentary on the impact of global climate change on fisheries and aquaculture with special reference to India 2021-04-11T03:38:43+00:00 Joystu Dutta Tirthankar Sen Ankita Mitra Sufia Zaman Abhijit Mitra <p>Abstract not available</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 457-463, 2020</p> 2021-04-11T03:31:19+00:00 ##submission.copyrightStatement## Flight muscle and flight activity of Junonia almana (Lepidoptera: Nymphalidae) and Apis dorsata (Hymenoptera: Apidae) 2021-04-11T03:38:46+00:00 Pinakshi Roy Shanjida Sultana Tangin Akter Shefali Begum Farhana Ferdousi <p>Abstract not available</p> <p>Bangladesh J. Zool. <strong>48</strong>(2): 465-472, 2020</p> 2021-04-11T03:31:31+00:00 ##submission.copyrightStatement##