Fish Biodiversity in Bangladesh: Coastal & Estuarine Environment (original) (raw)
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Fish Species Availability In The Fish Landing Centers Of Patuakhali, Bangladesh
An investigation was carried out on the fish species availability in the fish landing centers of Patuakhali district from March, 2012 to December 2012 to know the present status of freshwater, brackish water and marine species variety and their relative abundance in Patuakhali, the coastal district of Bangladesh. Almost all the major fish landing centers (seven) were surveyed using questionnaire. A total of 138 inland and marine water fish and crustacean species were observed. Out of 138, 126 species belongs to finfish and rest 12 species to crustacean. Amongst the fin fish species, 61 were freshwater, 10 exotic and 55 marine water species. Twenty one fish species were found both in marine and freshwater. Eighteen species were detected as endangered (
Fish Species Availability In The Fish Landing Centers Of Patuakhali, Bangladesh
An investigation was carried out on the fish species availability in the fish landing centers of Patuakhali district from March, 2012 to December 2012 to know the present status of freshwater, brackish water and marine species variety and their relative abundance in Patuakhali, the coastal district of Bangladesh. Almost all the major fish landing centers (seven) were surveyed using questionnaire. A total of 138 inland and marine water fish and crustacean species were observed. Out of 138, 126 species belongs to finfish and rest 12 species to crustacean. Amongst the fin fish species, 61 were freshwater, 10 exotic and 55 marine water species. Twenty one fish species were found both in marine and freshwater. Eighteen species were detected as endangered (Ompok pabda, Tenualosa toli, Sperata aor, Chitala chitala, Puntius sarana, Rita rita, Nandus nandus, Notopterus notopterus, Wallago attu, Channa marulius, Labeao bata, Pangasius pangasius, Puntius ticto, Osteobrama cotio, Labeo calbasu, Chanda nama, Bagarius bagarius and Rasbora rasbora). On the basis of abundance, carp species, Tenualosa ilisha, Lates calcarifer, Trichiurus haumela, Penaeus monodon and Scylla serrata were recorded most abundant.
Fish Availability and Marketing System at Three Markets in Barisal, Bangladesh
The fish availability and marketing system at three markets in Barisal were studied for a period of twelve months from August 2012 to July 2013. Data were collected through questionnaire interviews and focus group discussions. A total number of 64 fish species were recorded in the three markets during the study period. Among them highest amounts were ilish (39%) and lowest amounts were Thai koi (2%). About 85% of the fishes were brought from different rivers and ponds of the Barisal region and only 15% from Mymensingh, Jessor, Satkhira and from India (major carps). The marketing channel from fishermen/fish farmer to consumers passes through a number of intermediaries such as local paikers/aratdar/mahajan (local agent), wholesalers and retailers. The average gross profit of fish retailers in Port Road Bazar, Natun Bazar and Lakhutia Bazar were estimated as BDT 950/day, BDT 750/day and BDT 400/day (1 US$=78 BDT), respectively. Lack of storage facilities, poor supply of ice, exploitation by middlemen, lack of money and infrastructure were the common constraints of the fish marketing.
Objective: To assess the catch composition and seasonal variation in catch of set bagnet fishery from the coastal Payra river, to understand the importance and impact of set bagnet fishery on biodiversity and fisheries, and to find out feasible strategies to reduce the negative impact of set bagnet fishery. Methods: The research was conducted with selection of research area, preparation of gear survey and catch assessment form, sample collection, laboratory analysis and selection of analytical methods to achieve the objectives of the study. Results: A total of 52 species belonging to 23 families were recorded from set bagnet in the Payra river. Most important commercial fishes and their annual catch by set bagnet in the study area were 51.03 MT Ilish ( Tenualosa ilisha ), 8.83 MT Rita ( Rita rita ), 6.92 MT Air ( Sperata aor ), 4.72 MT Chital ( Chitala chitala ), 2.03 MT Boal ( Wallago attu ), 1.84 MT Baghair ( Bagarius bagarius ), 3.35 MT Foli ( Notopterus notopterus ) and 13.46 MT Golda chingri ( Macrobrachium rosenbergii ). All these species were mostly caught at initial stages of their life cycle, which usually move with the tidal current. Conclusions: Study suggested that set bagnet should be restricted to allowable limit with strong monitoring system for the protection and conservation of valuable fish species in the coastal areas of Bangladesh.
ICHTHYOFAUNA OF THE RIVER HALDA, CHITTAGONG, BANGLADESH
Eighty-three species of finfish belonging to 13 Orders, 35 Families, and 69 genera including three exotic species, and 10 species of shellfish (crustaceans) under one order, 3 families and 3 genera were identified from the River Halda during September 2004 to December 2011. Thus a total of 93 species of Ichthyofauna (finfish and shellfish) were recorded from this river during the seven years (2004-2011) of investigation. Maximum number of finfish species were recorded under the family Cyprinidae (19 species) followed by the family Gobiidae (11 species), whereas maximum number of shellfish species were recorded under the family Palaemonidae (8 species) followed by Penaeidae (1 species) and Portunidae (1 species). Of the 83 finfish species, three belonged to the critically endangered, nine to the endangered and eight to the vulnerable category according IUCN (2000). Four species of finfish were new records from inland waters of Bangladesh. A systematic list of the ichthyofauna with local and English names, and habitat preference are provided.
Status and current worries of fish diversity in the Payra river, Patuakhali, Bangladesh
The study was conducted for a period of one year from April 2013 to March 2014 in the Payra River, Patuakhali, Bangladesh. A total of 114 fish species under 12 orders and 36 families were recorded in the River. On the basis of availability, the recorded species were categorized into four statuses and obtained as available (43.86%), less available (29.82%), rare (18.42%) and very rare (7.89%). Result of the study identified nine species as very rare which may extinct near future resulting declination of the fish diversity. Overfishing, indiscriminate fishing of larvae and juveniles, siltation and pollution were identified as the major worries linked with the declination of fish diversity. Study suggested that the activities which have harmful impact on fisheries resources need to be decreased and should be restricted to save our valuable fish diversity in the Payra River
Archives of Agriculture and Environmental Science , 2018
The study was aimed to find out the present status and causes of fish and shellfish diversity reduction in the Rupsa River of Bangladesh. Studies were conducted for a period of 6 months from July to December 2016. Focus group discussions (FGD), questionnaire interviews (QI) and key informant interviews (KII) were done to collect appropriate data from the local fishers and resource persons. A total of 62 species of fish and shellfish from 23 families were found in the river and 9 species disappeared in last 10 years. The species availability status was remarked in three categories and obtained as 14 species were commonly available, 28 species were moderately available and 20 species were rarely available. The highest percentage of fishes was catfishes (24.19%). There was a gradual reduction in the species diversity from previous 71 species to present 62 species with 12.68% declined by last 10 years. Average fish catch per fishermen per day reduced from 8.35 kg to 2.95 kg in last 10 years. Combined effects of some manmade and environmental factors are responsible for the loss of biodiversity. Majority of the respondents (90%) agreed that two manmade factors namely overfishing and navigation are mainly responsible for the loss of fish and shellfish diversity in the river followed by use of illegal fishing gears (86%), pollution (72.5%) and urbanization (64%). During the survey, 93.25% respondents reported water depth reduction as the main environmental factor followed by siltation and sedimentation (91%), temperature (61.75%) and turbidity (56%). The present work recommends preventing water pollution, maintaining fishing gears, increasing fishers’ awareness, implementing fisheries laws and establishing fish sanctuary to conserve finfish and shellfish diversity in the river. Moreover, counter and random surveys are also recommended to crosscheck the fishes’ status and decline causes for ensuring their proper management and conservation.
The present study was conducted for a period of one year from April 2016 to March 2017 to identify the present status and threats to fish diversity in the wetlands of Chhatak, Bangladesh. A total of 71 fish species, including prawn under 11 orders and 25 families were recorded from the wetlands. Cypriniformes (32.38%) was the most dominant order, followed by Siluriformes (25.35%), Perciformes (19.72%), Synbranchiformes and Channiformes (5.63%), Clupeiformes (4.23%), Decapoda (4.23%), Beloniformes (2.82%), Osteoglossiformes (2.82%), Tetraodontiformes (1.41%) and Cyprinodontiformes (1.41%). Cyprinidae was the most dominant family contributing 20 species. The recorded species were categorized on the basis of availability into four statuses and found as available (40.85%), less available (29.58%), rare (14.08%) and very rare (15.49%). The present study suggested that use of appropriate fishing gears, establishment of the sanctuary, community based fisheries management, stocking of commercially important fish species, implementation of fishing laws and regulation, Government support and fishermen's awareness can save the valuable fish diversity of the study area.
An investigation was carried out to acquire the knowledge regarding charberjal operation system in Tetulia River and its impact on fisheries biodiversity in the coastal region of Bangladesh over a period of 6 months between July and December 2016. Combination of questionnaire interview, focus group discussions and crosscheck interviews were accomplished with key informants during data collection. Charberjal is operated in the shoreline of rivers, submerged chars and inundated agriculture land including tiny canals all over the coastal region of Bangladesh. A total of 80 species including finfish, freshwater prawn, crabs and mollusk was recorded under 22 families including 38 SIS and 26 threatened species during the study period. The recorded species was 60 finfish, 14 prawn, 4 mollusk and 2 crabs. Among the finfish rui, bata, mullet, khorsula and poa were the dominant species while aire, boal, bacha, ramsosh and tengra were the foremost species among catfish. Moreover, Macrobrachium rosenbargii was the most prevailing species among fresh water prawn while bele, phasa, puti, shol, dimua chingri and SIS were the most leading species among others. All types and all size of fish, prawn, mollusk and crustaceans and their larvae are trapped by this net during operation due to use small mesh size net and the trapped fishes die just after drying up of the shore and mixed with soil. As a result, huge number of commercially important fish larvae, eggs and fish fry are accidentally destroyed by charberjal operation system in the coastal region of Bangladesh. Due to lack of knowledge and indiscernible competition among the fishermen for fishing, they use this type of illegal and destroying fishing net for fishing which decline the fisheries biodiversity in the coastal region of Bangladesh. Charberjal is very harmful and has severe impact to destroy fisheries biodiversity including threatened species in the coastal region as well as all over the country. [Md. Moazzem Hossain, Masum Billah, Md. Belal Hossen, Md. Hafijur Rahman. Operational System and Catch Composition of Charberjal (Fixed Net) in Tetulia River and its Impact on Fisheries Biodiversity in the Coastal Region of Bangladesh. Nat Sci 2018;16(1):52-61]. ISSN 1545-0740 (print); ISSN 2375-7167 (online). http://www.sciencepub.net/nature. 7.