scholarly journals Present Status of Aquatic Resource and Its Catch of Mogra River in Bangladesh

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Chakraborty, B. K. ◽  
Verma A. K. ◽  
Muniya, S.
Keyword(s):  
Lower Risk ◽  
Flood Plain ◽  
Aquatic Species ◽  
Aquatic Fauna ◽  
Aquatic Resource ◽  
Management Technology ◽  
Fishing Gears ◽  
Commercially Important ◽  
Data Deficient ◽  
Fish Productivity

Bangladesh is very rich in aquatic fauna with a biodiversity. The present study, conducted during 2015 to 2019, recorded a total number of 131 spe cies (104 fish, 09 prawn, 01 snail, 04 crabs, and 13 turtles) belonging to 26 families were identified from the Mogra River and its flood plain. About ten types of fishing gears, different crafts, hook and line were found oper ative in the river. Increasing rates of using current jal (16.0-26.40%) and Kapuri jal (11.0-16.70%) were identified as detrimental gears destroyingdifferent species. The fish productivity was decreased dramatically from 170.63±10.81mt to 134.75±8.02 mt with a decreasing percentage of 6.26 to 21.03% within five years. Three important aquatic species turtiles (Cyclemys oldhami, Melanocheelys trjuuga and Morenia petersi) became rare and 17 commercially important aquatic species were at the edge of extinction (critically endangered, CR). From the study, 67 species were recorded inthe endangered (EN) category, 20 species vulnerable status (VU), 11 species lower risk (LR), 07 species Least concern (LC) and 04 Data deficient (DF). To save the existing aquatic species in the studied riverine ecosystem and ensure better livelihood of the fishes, a team of local management committee, similar to the Hilsa fisheries management technology is needed.

scholarly journals Does a Trawl Ban Benefit Commercially Important Decapoda and Stomatopoda in Hong Kong?

Ecosystems ◽  
2020 ◽  
Author(s):  
Lily S. R. Tao ◽  
Gilbert C. S. Lui ◽  
Kingsley J. H. Wong ◽  
Tommy T. Y. Hui ◽  
Yanny K. Y. Mak ◽  
...  
Keyword(s):  
Hong Kong ◽  
Critical Role ◽  
Field Surveys ◽  
Complex Interactions ◽  
Fishing Gears ◽  
Mean Size ◽  
Commercially Important ◽  
Outer Estuary ◽  
Hong Kong Waters

Abstract Crustaceans were among the most valuable fishery resources in Hong Kong. However, the unrestricted and intensive use of different fishing gears, especially bottom trawling, has led to the depletion of commercially important crustaceans in Hong Kong since the 1980s. This study investigated whether commercial crustaceans recovered after the implementation of a permanent Hong Kong-wide trawl ban that began on December 31, 2012. Standardized field surveys were conducted using a commercial shrimp trawler at two sites in eastern and western waters of Hong Kong before (2004) and after the trawl ban (2013–2014 and 2015–2016) and two sites in southern waters after the trawl ban. Diversity, mean size, abundance, biomass and level of disturbance of commercial crustaceans from the three periods were investigated. The eastern waters exhibited an increased diversity of crustacean assemblages in Inner Tolo, and a higher abundance and biomass of crabs were detected in Outer Tolo after the trawl ban. Reduced disturbance, higher diversity in crustacean assemblages and greater abundance and biomass of predatory crabs were observed after the trawl ban in the outer estuary of western waters, and increased abundance and biomass of shrimp were detected in the inner estuary of western waters. No temporal or negative changes were detected in the southeast and southern waters of Lamma Island. The various responses of crustacean assemblages in Hong Kong waters revealed the critical role of complex interactions among multiple stresses, such as ongoing reclamation works, illegal trawling activities and increased fishing efforts using other (legal) fishing methods.

Parasitic Crustaceans

2020 ◽  
pp. 401-434
Author(s):  
Barbara F. Nowak ◽  
Melissa B. Martin ◽  
Sebastián Boltaña
Keyword(s):  
Economic Impacts ◽  
Aquatic Species ◽  
Negative Effects ◽  
Management Options ◽  
Chemical Treatments ◽  
Potential Benefits ◽  
Commercially Important ◽  
Fish And Shellfish ◽  
Crustacean Parasites ◽  
Important Fish

This chapter provides a brief overview of crustacean parasites that infect commercially important fish and shellfish. Crustaceans are a diverse group of arthropods, with over 60,000 species that are significant to the aquaculture and fisheries sector, including parasitic species affecting other crustaceans, mollusks, and fishes. This chapter focuses on parasitic caligid copepods (sea lice), cymothoid isopods, and pea crabs of high economic impacts on commercially important aquatic species. The biology of the parasites, their effects on their hosts, the epidemiology of the infections, and economic impacts of these groups are described. Chemical treatments and husbandry modifications as management options for a range of crustacean parasites are presented, which includes the use of cleaner fish to remove parasites, specially designed cages to reduce infestation of parasites, or moving farms to deeper waters. The utilization of crustacean parasites as marine pest controls is further discussed, with emphasis on either its potential benefits or the negative effects on native crab populations. Despite the continuous adverse impacts parasitic crustaceans have on aquaculture, the progressive understanding of their biology and ecology may eventually lead to mitigation, if not complete eradication, of the parasites.

scholarly journals Catch assessment of artisanal marine fishing gears in Cox’s Bazar and Teknaf of Bangladesh

2016 ◽  
Vol 27 (2) ◽  
pp. 228-234
Author(s):  
SK Ghosh ◽  
MK Ahsan ◽  
MK Ahmmed ◽  
SI Ahmed ◽  
MM Hasan ◽  
...  
Keyword(s):  
Fish Species ◽  
Fishing Gear ◽  
Catch Per Unit Effort ◽  
Beach Seine ◽  
Gill Net ◽  
Fishing Gears ◽  
Dominant Fish ◽  
Commercially Important ◽  
Marine Fishing ◽  
Harpadon Nehereus

Studies were conducted on catch assessment of some artisanal marine fishing gears operated in Cox’s Bazar and Teknaf areas from April 2014 to April 2015. Sixteen types of fishing gears were identified, of which gill net, beach seine net, estuarine set bag net, marine set bag net and trammel net occupy major fishing activities. Although estuarine set bag net (ESBN) is a legally restricted fishing gear recorded the highest catch per unit effort (CPUE) (110 kg/gear/day) in July followed by marine set bag net (MSBN) (105 kg/gear/day) in Cox’s Bazar and the highest CPUE was recorded 100 kg/gear/day by ESBN in June followed by MSBN (90 kg/gear/day) in Teknaf. Out of 52 species of fishes, the major fish species abundantly caught by these gears were Poa (Otolithoides argenteus), Churi (Trichiurus haumela), Loittya (Harpadon nehereus), Ranga choukha (Lutjanus johni), Lal poa (Johnius argentatus), Olua (Coilia dussumieri), Rup chanda (Stromateus chinensis), (Stromateus argenteus) and Ilish (Tenualosa ilisha). Besides these fish species, 10 commercially important shrimp species and 3 important crab species were also recorded during the study period. The peak season of availability of most fish species was June and July while lean season was December and January. This study indicated that Otolithoides argenteus) was the dominant fish species followed by Trichiurus haumela, Harpadon nehereus and Coilia dussumieri.Progressive Agriculture 27 (2): 228-234, 2016

scholarly journals Biodiversity and Management Status of Charia beel in Northern Bangladesh

2021 ◽  
Vol 2 (2) ◽  
pp. 63-80
Author(s):  
Binay Chakraborty ◽  
S.N. Labh ◽  
R. Rani ◽  
S. Bhattacharjee
Keyword(s):  
Local Ecological Knowledge ◽  
Secondary Data ◽  
Shannon Index ◽  
Primary Data ◽  
Management Technique ◽  
Ecological Knowledge ◽  
Total Production ◽  
Aquatic Species ◽  
Commercially Important ◽  
Puntius Sarana

Purpose: The aim is to study the condition of aquatic species in the Charia beel. A good management technique is developed for protecting biodiversity and productions of the beel in order to ensure food security. Subjects and Methods: Primary data was developed by a semi-structured questionnaires and primary data was collected by field observation which comprised of selected area of the beel basin, survey of different fishing methods, conducted a series of Focus Group Discussions (FGDs), applying Local Ecological Knowledge (LEK) and Key Informant Interview (KII). Secondary data were collected from the Department of Fisheries (DoF), comprehensive literature review and internet sites. The code of IUCN was followed to categorize the status of the beel and to compare the trend among different years Shannon index was followed. Results: A total number of 91 species (83 wild fishes, four prawns, one crab, one snail, and four species of turtles) belonging to 65 genera were identified from the Charia beel. About 10 types of operative fishing gear and craft were found in the river. The increasing rate of using current jal (20.50-30.50%) and Kapuri jal (14.60-18.00%) were identified as detrimental gear used to kill the different species during four years. A common increasing trend of using current jaal, Kapuri jaal (seine net) and FAD (Fish aggregating device) were identified as detrimental gear killing different species between 2016 and 2019. The fish productivity decreased dramatically from 184.52± 55.04 to 141.65± 57.66 mt within four years and the total production percentage (%) also sharply decreased from 8.88% mt to 23.23% over the same period. Conclusion: Commercially important 06  aquatic species namely Sarpunti (Puntius sarana), Napit (Badis badis), Gajar (Channa marulius) and Turtles (Kachuga tecta,Morenia petersi and Lissemys punctata) were regional extinct, 18 commercially important aquatic species were at the edge of extinction (critically endangered, CR), 35 species endangered (EN),  23 species vulnerable status (VU), five species were identified as lower risk (LR) and only four species of the river were not threatened (NT) in position between 2016 and 2019 in the this beel.

scholarly journals Dinamika pertumbuhan sepat siam (Trichopodus pectoralis, Regan 1910) di Perairan Rawa Banjiran Patra Tani Sumatra Selatan

DEPIK ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 444-451
Author(s):  
Aroef Hukmanan Rais ◽  
Sevi Sawestri ◽  
Dina Muthmainnah
Keyword(s):  
Native Species ◽  
Condition Factor ◽  
Growth Parameters ◽  
Mesh Size ◽  
Flood Plain ◽  
The Other ◽  
Long Period ◽  
Fish Samples ◽  
Fishing Gears ◽  
Exploitation Rate

The exploitation of Sepat siam (Trichopodus pectoralis, Regan 1910) that include native species of floodplain has been done on many years. One of the main fishing areas of this commodity is Patratani floodplain, Muara Enim Regency, South Sumatra. This commodity has been exploited over a long period and is expected to have a high pressure of fishing. The aim of this paper is to compare the utilization of sepat siam resources based on growth, mortality, and exploitation parameters between 2010 and 2017. Fish samples were collected monthly started from March to December in 2010, and April to December in 2017. The sample got from local fishers who fished around Patratani flood-plain waters. Sepat siam samples were measured on length (cm) and weight (gram) every month. The analysis has concluded based on the condition factor in both years. The growth parameters were analyzed by FiSATII software. The result of FiSAT II analysis drawn the growth factor was 0.86 in 2010, and have been growing slow to be 0.55 in 2017. The length infinitive in 2010 was around 21.5 cm and decreased to 18.3 in 2017. The other results showed that the exploitation level decreased from 0.61 in 2010 to 0.53 in 2017. The exploitation rate proved that the utilization of sepat siam was decreased but sill on overfishing conditions. The length size of sepat siam related to the optimum mesh size fishing gears was decreasing in 2017 compared to 2010. The age analysis shows for 21.5 cm of the infinitive length is achieved for 7 months in 2010, while 18.3 cm of that is reached for 10,5 months in 2017.Keywords:Exploitation levelFloodplainSepat siamABSTRAKKegiatan penangkapan Sepat siam (Trichopodus pectoralis, Regan 1910) yang merupakan spesies asli ikan rawa banjiran sudah dilakukan bertahun-tahun. Salah satu lokasi penangkapan komoditas ini adalah di rawa banjiran Patratani, Kabupaten Muara Enim, Provinsi Sumatra Selatan.Komoditas ini telah mengalami eksploitasi dalam jangka waktu yang lama dan diperkirakan mengalami tekanan penangkapan yang besar.Tulisan ini bertujuan untuk menampilkan eksploitasi atau pemanfaatan ikan sepat siam berdasarkan parameter pertumbuhan, mortalitas, dan eksploitasi pada tahun 2010 dan 2017. Sampel ikan dikumpulkan setiap bulan yaitu dimulai Maret hingga Desember 2010.Kegiatan pengumpulan sampel dilanjutkan pada April hingga Desember 2017.Sampel ikan diperoleh dari tangkapan nelayan lokal yang memancing di sekitar perairan rawa banjiran Patratani.Sampel ikan diukur panjang (cm) dan berat (gram).Parameter pertumbuhan dianalisis menggunakan perangkat lunak FiSAT II. Hasil analisis FiSAT II menggambarkan faktor pertumbuhan sepat siam pada 2010 sebesar 0,86, dan tumbuh melambat menjadi 0,55 pada 2017. Panjang infinitif sepat siam pada 2010 sekitar 21,5 cm dan turun menjadi 18,3 pada 2017. Analisis tingkat eksploitasi menunjukkan hasil menurun dari 0,61 pada 2010 dan 0,53 pada 2017, namun masih dalam kondisi penangkapan ikan menunjukkan tangkapan berlebih. Hubungan antara ukuran panjang sepat siam dengan ukuran optimal alat tangkap menunjukkan hasil menurun pada 2017. Analisis usia menunjukkan bahwa panjang infinitif 21,5 cm dicapai selama 7 bulan pada 2010, sementara perlu waktu 10,5 bulan pada 2017 untuk mencapai panjang infinitif 18,3 cm.Katakunci:Tingkat eksploitasiRawa BanjiranSepat siam

Look in a Microscope to Determine the Age of a Shrimp, Crab, or Lobster!

2013 ◽  
Vol 21 (3) ◽  
pp. 8-8
Author(s):  
Stephen W. Carmichael
Keyword(s):  
Annual Growth ◽  
Aquatic Species ◽  
Aquatic Animals ◽  
Growth Bands ◽  
Commercially Important ◽  
Hard Structures ◽  
Fish Otoliths

The ability to determine the age of commercially important aquatic species is important to managing their populations. Whereas the age of most aquatic animals can be found by counting annual growth bands in hard structures, such as the fish otoliths (stone-like structures in the ear that are important for balance and orientation) and bivalves' shells, a technique to directly and accurately age individual crustaceans does not exist. At least it didn't until the recent study by Raouf Kilada, Bernard Sainte-Marie, Rémy Rochette, Neill Davis, Caroline Vanier, and Steven Campana. This is a bit of surprise because nothing equivalent to the hard structures of fish or bivalves had been found, or even expected to exist, in crustaceans. This is simply because this group of animals grow by molting or by shedding off their skins. Not only does molting frequency vary considerably among species of crustaceans, but molting individuals are assumed to lose and replace all calcified structures, including the cuticle (exoskeleton), that might record annual growth.

scholarly journals Fish Diversity and Conservation Perspectives of Gandak River, India

Our Nature ◽  
2013 ◽  
Vol 11 (1) ◽  
pp. 76-84 ◽  
Author(s):  
P. K. Srivastava
Keyword(s):  
Distribution Pattern ◽  
Fish Species ◽  
Lower Risk ◽  
Uttar Pradesh ◽  
Assemblage Structure ◽  
Fish Diversity ◽  
Threat Status ◽  
Commercially Important ◽  
Gandak River ◽  
Near Threatened

Study of 10 km stretch of Gandak River in Uttar Pradesh revealed the ichthyofaunal diversity, assemblage structure, distribution pattern, threat status, ornamental and commercially important fishes. In all 54 fish species were recorded of many commercially important fishes. Among these species 45% belong to lower risk near threatened (LRnt), 26% vulnerable (VU), 11% lower risk least concern (LRlc), 11% not evaluated (NE) and 7% endangered (EN) category. Cyprinidae 33% were most important followed by Bagridae (11%), Channidae (9%), Tetradontidae (5%). DOI: http://dx.doi.org/10.3126/on.v11i1.8246 Our Nature Vol.11(1) 2013: 76-84

scholarly journals Czerwona lista porostów wymarłych i zagrożonych w Polsce [Red List of extinct and threatened lichens in Poland]

2014 ◽  
Vol 91 ◽  
pp. 13-49 ◽  
Author(s):  
Stanisław Cieśliński ◽  
Krystyna Czyżewska ◽  
Jerzy Fabiszewski
Keyword(s):  
Lower Risk ◽  
Iucn Red List ◽  
Red List ◽  
Critically Endangered ◽  
Iucn Red List Categories ◽  
Lichen Biota ◽  
The Status ◽  
Red List Categories ◽  
Data Deficient ◽  
Near Threatened

The authors present a list of regionally extinct, threatened, lower risk and insufficiently status taxa of lichens in whole Poland. It is thirth edition of our list. Status of threat to the lichen species used has been determined according to the IUCN Red List Categories in version 3.1 (modified by GlNSBURG 2001). The Red List includes 886 taxa, which constitute 55.4% of the Polish lichen biota. The status of threatened biota has the following categories: Regionally Extinct (RE) - 141 taxa, Critically Endangered (CR) - 179, Endangered (EN) - 201, Vulnerable (VU) - 165, Near Threatened (NT) - 68, Least Concern (LC) - 22 and Data Deficient (DD) 110.

scholarly journals The Role of Science in The Management of Biodiversity: a Case of Stingrays (Dasyatidae) Research to Provide Basic Data for Aquatic Fauna Conservation in South Sumatra

2018 ◽  
Vol 68 ◽  
pp. 04010
Author(s):  
Iqbal Muhammad ◽  
Yustian Indra ◽  
Zulkifli Hilda
Keyword(s):  
Fish Diversity ◽  
The South ◽  
International Union ◽  
Aquatic Fauna ◽  
Conservation Actions ◽  
Study Case ◽  
Threatened Fishes ◽  
Data Deficient ◽  
High Level

The study of fish diversity had been reported accross the South Sumatran waters, but the study focus on stingrays (family Dasyatidae) were very limited. In general, many stingrays species face high level of direct exploitation. A recent study to provide valid checklist of stingrays in South Sumatran waters found 14 species: Brevitrygon heterura, Fluvitrygon kittipongi, Fluvitrygon oxyrhyncha, Fluvitrygon signifier, Fluvitrygon sp ‘musi’ 1, Fluvitrygon sp ‘musi’ 2, Himantura undulata, Himantura uarnak, Maculabatis gerrardi, Pateobatis fai, Pateobatis uarnacoides, Pastinachus ater, Telatrygon biasa and Urogymnus polylepis. Following IUCN (The International Union for Conservation of Nature) Red List status 2018, ten species of stingrays are threatened, with four species as Endangered, five species as Vulnerable and one species as Data Deficient. These findings suggest the South Sumatran waters are important habitat for stingrays in Indonesia, and immediate conservation actions plan is needed. In this paper, we demonstrate the role of science in biodiversity management with stingrays (Dasyatidae, an iconic group of rare and threatened fishes) as study case.1.

scholarly journals Karakteristik Penangkapan dan Produksi Ikan di Kabupaten Barito Selatan, Kalimantan Tengah

2017 ◽  
Vol 22 (4) ◽  
pp. 215
Author(s):  
Aroef Hukmanan Rais
Keyword(s):  
Flood Plain ◽  
Rainfall Rate ◽  
Fishing Gear ◽  
Large Area ◽  
Central Kalimantan ◽  
Plain Area ◽  
Gill Net ◽  
Long Line ◽  
Fishing Gears ◽  
Lake Fish

ABSTRAK  Kabupaten Barito Selatan di Provinsi Kalimantan Tengah memiliki potensi dan produksi perikanan yang besar dari perairan umum daratan. Wilayah rawa banjiran yang luas, jumlah alat tangkap yang bervariasi dan kegiatan penangkapan yang tinggi menjadi salah satu sumber potensi dan penopang perekonomian di wilayah ini. Tulisan ini menguraikan sebaran penggunaan alat tangkap berdasarkan lokasi dan musim penangkapan dan menganalisis pengaruh curah hujan terhadap laju tangkap dan komposisi hasil tangkapan pada beberapa alat tangkap di wilayah perairan Kabupaten Barito Selatan. Pengambilan sampel dilakukan dengan menggunakan bantuan 12 orang nelayan enumerator di empat lokasi berbeda. Lokasi tersebut yaitu Danau Palui, Danau Pamait, Desa Jelapat, dan Danau Ganting. Terdapat tujuh jenis alat tangkap yaitu rawai (long line), tampirai (stage trap), lunta (cash net), banjur (stake line), rengge (gill net), lukah (pot trap) dan selambau (seine net). Data curah hujan diperoleh dari stasiun BMKG Kabupaten Barito Selatan. Data dikumpulkan selama sembilan bulan dari Februari hingga Oktober 2015. Nilai produksi dan laju tangkap dikorelasikan dengan curah hujan menggunakan uji-t, sedangkan hasil tangkapan di tabulasi sesuai jenis alat tangkap dan waktu penangkapan. Diperoleh nilai korelasi signifikan antara produksi, laju tangkap terhadap curah hujan. Sebaran alat tangkap banyak diperoleh bervariasi pada wilayah rawa banjiran yang dangkal. Sebanyak 43 spesies ikan yang tertangkap menggunakan tujuh jenis alat tangkap. Alat tangkap selambau (seine net) memiliki variasi hasil tangkapan tertinggi. The South Barito Regency has high potential and production of inland fisheries in Central Kalimantan Province. The large area of flood plain, various of fishing gears and intensive fishing. This paper describes the distribution of fishing gear utilization based on location and fishing season and, analyzes  the effect of rainfall on the fishing rate and fish composition of several kind of fishing gears in South Barito Regency waters. Samples collection were done by 12 enumerators fishermen at four different locations. The locations include Palui lake, Pamait lake, Jelapat village, and Ganting lake. Fish production was tabulated based on fishing gear and fishing periode. Rainfall rate data were obtained from BMKG (Agency for Meterology, Climatology and Geophysic) of South Barito Regency. Data were collected during nine months from February to October 2015. Production and fishing rate were significantly correlated to rainfall rate with t-test.Results show that there were about 7 fishing gears such as: rawai (long line), tampirai (stage trap), lunta (cash net), banjur (stake line), rengge (gill net), lukah (pot trap) and selambau (seine net). There is a significant corellation between production and fishing rate to the rainfall rate. The distribution of fishing gear is more varied in shallow flood plain area. About 43 species of fish were caught using 7 different fishing gears. Selambau (seine net) caught the highest variation of fish species.  

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