Bangladesh Journal of Zoology最新文献

{"title":"Comparative study on Headless Shell-On (HLSO) Black Tiger Shrimp (Penaeus monodon) processing under on board and land based factory facilities","authors":"S. Ahmed, M. Uddin, S. Istiak","doi":"10.3329/BJZ.V48I2.52378","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52378","url":null,"abstract":"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. \u0000Bangladesh J. Zool. 48(2): 393-398, 2020","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79280226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surveillance of Escherichia coli in a fish farm of Sylhet, Bangladesh","authors":"Rizoneul Haq Reza, Shahena Aktar Shipa, M. Naser, Faruque Miah","doi":"10.3329/BJZ.V48I2.52373","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52373","url":null,"abstract":"The study was accomplished to investigate Escherichia coli from two freshwater fish, Tilapia (Oreochromis niloticus) and Mrigal (Cirrhinus mrigala), collected from a fish farm in Sylhet, Bangladesh. Six of each fish were analyzed to isolate and detect Escherichia coli, and E. coli was identified based on morphological and biochemical characteristics. The antibiogram of E. coli was investigated in different generations using eight antibiotic discs such as Chloramphenicol (CH), Streptomycin (S), Gentamycin (G), Ciprofloxacin (CI), Cotrimethoxazole (CO), Azithromycin (AZI), Erythromycin (E) and Novobiocin (NV), and the sensitivity of E. coli 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 E. coli was 81.25% and 87.5% respectively, whereas, for the rest of the antibiotics, it was 0%.","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75772055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proximate composition, amino acids and fatty acids profiles of wild and cultured Climbing Perch, Anabas testudineus (Bloch, 1795)","authors":"Mst Taslima Akter, H. Faruque, R. Hasan, M. Rahman","doi":"10.3329/BJZ.V48I2.52376","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52376","url":null,"abstract":"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, Anabas testudineus, 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 (p<0.05) between wild and cultured fishes depend on season. The highest amount of moisture (79.62±0.92%) was found in wild A. testudineus and lowest amount of ash (2.50±0.09%) was found in cultured A. testudineus during pre-monsoon. For both cultured and wild A. testudineus, amount of protein was higher in postmonsoon 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 (p<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 A. testudineus were oleic acid (18:1), palmitic acid (16:0), linoleic acid (18:2), stearic acid (18:0), palmitoleic acid (16:1), andmyristic 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.","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91023070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using parasites as biological tag for Hilsa shad (Tenualosa ilisha) migration in Bangladesh waters","authors":"A. Bhuiyan, Zannatun Nahar Jhinu","doi":"10.3329/BJZ.V48I2.52366","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52366","url":null,"abstract":"The study was aimed at following the movement of adolescent Tenualosa ilisha 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 Ilisha parthenogenetica and acanthocephalan parasite Acanthosentis indica and Acanthosentis hilsai. 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 T. ilisha as a whole, migrates from the sea to the rivers via the estuaries and vice versa. \u0000Bangladesh J. Zool. 48(2): 243-251, 2020","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81434742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Brief commentary on the impact of global climate change on fisheries and aquaculture with special reference to India","authors":"Joystu Dutta, Tirthankar Sen, Ankita Mitra, S. Zaman, A. Mitra","doi":"10.3329/BJZ.V48I2.52382","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52382","url":null,"abstract":"Climate Change is a global phenomenon and is one of the burning glitches and emerging environmental issues in present time. The impact of climate change is manifold and having indelible impact on all aspects of earth life and biodiversity. Fisheries and Aquaculture have been considered as an important branch of Indian subcontinent economy associated with agriculture and allied sectors. Millions of stakeholders are dependent directly or indirectly on aquaculture and fisheriessector for their livelihood belonging mostly to the bottom of economic pyramid with lower incomes, unorganized jobs, greater socio-economic vulnerability. Often they are under privileged andmostly affected by the vagaries of climate change. Erratic temperature and rainfall patterns, storm-water surges, salinity invasion, increasing sea-surface temperature, oceanic acidification, salinization of freshwater resources associated with tropical cyclones such as Aila, Fani, Bulbul to the very recent Amphan and Nisarga has created a havoc loss in fisheries and aquaculture sector in both east and west coast of India as well as along Bangladesh coast. Frequent natural disasters associated with global climate change have been a common global phenomenon since last decade. Therefore, it is pertinent to understand the crucial interplay between multifarious impacts of global climate change on fisheries as well as aquaculture sector. Innovation and proper incubation of entrepreneurial opportunities in fisheries and aquaculture sector might provide the necessary oxygen for growth and proliferation. This can also help other developing economies relying on fish and aquaculture resources to develop a holistic approach on similar lines. This scientific communication throws light on these aspects through a brief commentary. INTRODUCTION: Ecosystems across the world are facing unanticipated changes due to fluctuations of global climate since the last century (Guldberg and Bruno, 2010; Pachauri, 2007)). The comprehensive understanding of how anthropogenic","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78776646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Toxicological effect and behavioral response of a predatory Stinging Catfish, Heteropneustes fossilis exposed to three indigenous plant seed extracts","authors":"Sadia Sultana, M. Nasiruddin, M. Azadi, Chowdhury","doi":"10.3329/BJZ.V48I2.52377","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52377","url":null,"abstract":"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, Jatropha carcus (Linn.), Hydnocarpus wightianus (Blume) and Aleurites moluccana (Linn. Willd) were studied on the predatory fish, Heteropneustes fossilis (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 J. carcus, H. wightianus and A. moluccana on H. fossilis could be ranked in the order: Acetone > methanol > 50% ethyl alcohol > distilled water. On the basis of LC50 values the most toxic was acetone extract of J. carcus seeds and least toxic was distilled water extract of A. moluccana seeds. It is suggested that these plant seed extracts would be helpful in aquaculture to remove unwanted fish species from culture ponds.","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82551175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Butterfly diversity in the three selected areas in Dhaka city, Bangladesh","authors":"A. Islam, A. Kashem, A. Alim, F. Zohora","doi":"10.3329/BJZ.V48I2.52380","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52380","url":null,"abstract":"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.","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86852792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flight muscle and flight activity of Junonia almana (Lepidoptera: Nymphalidae) and Apis dorsata (Hymenoptera: Apidae)","authors":"Pinakshi Roy, S. Sultana, T. Akter, S. Begum, F. Ferdousi","doi":"10.3329/BJZ.V48I2.52383","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52383","url":null,"abstract":"Flight ability is a felicity for insects not only to fly around but also to other important purposes like to acquire mates, feed, communicate, defend, disperse and locate host plants (Engel 2015). With this incentive, the present study was conducted to examine the flight activity and flight muscle of Junonia almana (both male and female) butterfly and Apis dorsata worker honey bee at 30 ± 5oC and 75% RH. By following the tethered flight technique for one hour it was found that among the three (male and female butterfly and honey bee), female butterflies flew more times (21.65 ± 5.98 min) compared with others. Similarly, in terms of the measurement (mean length, breadth and volume) of forewing and dorso-longitudinal muscle, female butterfly showed higher value than male butterfly and honey bee. Butterflies occupy a vital position in the ecosystem by playing role as pollinators of plants promoting genetic diversity and contributing to natural sustainability and for their role as indicators of environmental quality (Reddi et al. 2002). They are called accidental pollinators that unintentionally pick up pollen on their legs and body while perching on flowers to forage for nectar (Boggs and Ross 1993). Butterflies heavily depend on their flight ability to get mates, feed, disperse and locate host plants. Besides chemical defenses and camouflage, adult butterflies rely on their flight ability to avoid predation (Chai and Srygley 1990). Honey bees play an important role in ecology as pollinators of many plant species. Their products have great commercial importance around the world. They are major agricultural pollinators and are keystone pollinators especially in tropical ecosystems (Suwannapong et al. 2012). Conservation of many habitats depends upon the preservation of bee populations. Reproduction of major elements of flora may be severely limited if the bee population disappear (Michener 2000). Among the castes of honey bee colony, only the worker bees act as forager. Worker honey bees are sterile female. The flight ability of a bee is determined by many factors, including the mass of the bee, the mass of the","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85896327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular identification and life cycle of Black Soldier fly (Hermetia illucens) in laboratory","authors":"L. Ferdousi, N. Sultana, Maha A. Helal, N. Momtaz","doi":"10.3329/BJZ.V48I2.52381","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52381","url":null,"abstract":"Molecular identification and life cycle of the Black Soldier Fly (BSF), Hermetia illucens were carried out from the Bangladesh bio-geographical area. The sequencing result and phylogenetic analysis of BSF showed 99-100% similarity with H. illucens 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.","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89663634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maximum Sustainable Yield for the Passur river fishery of Bangladesh by using Surplus-production model","authors":"M. Rouf, Sheik Istiak Md Shahriar, Md. Hafizur Rahman, M. Hasan, Al-Hasan Antu, Md. Noman Siddiqui","doi":"10.3329/BJZ.V48I2.52370","DOIUrl":"https://doi.org/10.3329/BJZ.V48I2.52370","url":null,"abstract":"Maximum sustainable yield (MSY), fishing effort (fmsy) 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 fmsy 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 (fmsy). 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.","PeriodicalId":8702,"journal":{"name":"Bangladesh Journal of Zoology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81685102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}