Overview of river prawn farming in Bangladesh.

2020 ◽  
Author(s):  
Nesar Ahmed
Keyword(s):  
Macrobrachium Rosenbergii ◽  
Stocking Density ◽  
Culture Method ◽  
International Market ◽  
Freshwater Snail ◽  
Paddy Fields ◽  
South West ◽  
Pila Globosa ◽  
Almost All

Abstract In south-west Bangladesh, thousands of farmers have converted their paddy fields into ghers to accommodate profitable river prawn (Macrobrachium rosenbergii) culture, in which prawn is cultured with fish and rice. Prawn post-larvae (PLs) are stocked in May-June and harvested from November to January. Farmers stock wild PLs rather than hatchery-produced stock as production of the latter is limited and farmers consider them to be of lower quality. The average stocking density of PLs is 20,680 ha-1. A variety of feeds is used for prawn culture but the preferred feed is the freshwater snail, Pila globosa. The production of prawn is quite variable because of the simple culture method, averaging 432 kg ha-1 year-1. The prawn is a high-value product for the international market and almost all prawns are therefore exported.

scholarly journals The Diversity of Root-Associated Endophytic Fungi from Four Epiphytic Orchids in China

Diversity ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 197
Author(s):  
Tao Wang ◽  
Miao Chi ◽  
Ling Guo ◽  
Donghuan Liu ◽  
Yu Yang ◽  
...  
Keyword(s):  
Endophytic Fungi ◽  
Southern China ◽  
Culture Method ◽  
Amplicon Sequencing ◽  
Community Diversity ◽  
Mycorrhizal Symbiosis ◽  
Epiphytic Orchids ◽  
Culture Independent ◽  
Almost All

Root-associated endophytic fungi (RAF) are found asymptomatically in almost all plant groups. However, little is known about the compositions and potential functions of RAF communities associated with most Orchidaceae species. In this study, the diversity of RAF was examined in four wild epiphytic orchids, Acampe rigida, Doritis pulcherrima, Renanthera coccinea, and Robiquetia succisa, that occur in southern China. A culture-independent method involving Illumina amplicon sequencing, and an in vitro culture method, were used to identify culturable fungi. The RAF community diversity differed among the orchid roots, and some fungal taxa were clearly concentrated in a certain orchid species, with more OTUs being detected. By investigating mycorrhizal associations, the results showed that 28 (about 0.8%) of the 3527 operational taxonomic units (OTUs) could be assigned as OMF, while the OTUs of non-mycorrhizal fungal were about 99.2%. Among the OMFs, Ceratobasidiaceae OTUs were the most abundant with different richness, followed by Thelephoraceae. In addition, five Ceratobasidium sp. strains were isolated from D. pulcherrima, R. succisa, and R. coccinea roots with high separation rates. These culturable Ceratobasidium strains will provide materials for host orchid conservation and for studying the mechanisms underlying mycorrhizal symbiosis.

scholarly journals Value-chain analysis of freshwater apple snail (Pila globosa) used for on-farm feeds in the freshwater prawn farming sector in Bangladesh

2014 ◽  
Vol 3 (2) ◽  
pp. 22-30 ◽  
Author(s):  
SAA Nahid ◽  
PJG Henriksson ◽  
MA Wahab
Keyword(s):  
Value Chain ◽  
Low Cost ◽  
Macrobrachium Rosenbergii ◽  
Freshwater Prawn ◽  
Value Chain Analysis ◽  
Apple Snail ◽  
Current Configuration ◽  
Pila Globosa ◽  
In Captivity ◽  
On Farm

Growth of the freshwater prawn (Macrobrachium rosenbergii) sector in Bangladesh since 1970s has been supported by natural availability of freshwater apple snail (Pila globosa), used for on-farm prawn feeds. The present study identified the current configuration of the value-chain benefits and constraints of freshwater apple snail in south-western Bangladesh in August 2011, based upon Rapid Market Appraisal (RMA) approach. The site of snail collection was Chanda Beel in Gopalganj district, while trading, processing and final consumption was represented by Rayer Mahal Bazar in Khulna district. There were seven different nodes recognized throughout the value chain. Snail marketing was identified as a seasonal business and took place during June to November each year. Between 1995 and 2011 the price of whole snail, meat and shell has increased by 800%, 325% and 315%, respectively. The abundance of snail had been reduced and its demand has increased due to the expansion of the prawn farming industry. Prawn farmers preferred snail meat due to its’ low cost (US$ 0.21 kg-1) as a source of protein compared to commercial prawn feed (US$ 0.41 kg-1). Snail harvesting and processing were considered as additional livelihood options for the poor, where 60% of the labour involved in snail harvesting were women, and 95% the de-shelling workforce. Induced breeding in captivity and sustainable management in nature as well as development of commercial production of apple snails might reduce the pressure on ecosystems and positively contributed to the continued expansion of freshwater prawn farming in Bangladesh. DOI: http://dx.doi.org/10.3329/ijarit.v3i2.17840 Int. J. Agril. Res. Innov. & Tech. 3 (2): 22-30, December, 2013

Residency and movement dynamics of southern rock lobster (Jasus edwardsii) after a translocation event

2015 ◽  
Vol 66 (7) ◽  
pp. 623 ◽  
Author(s):  
Adrian Linnane ◽  
Shane Penny ◽  
Peter Hawthorne ◽  
Matthew Hoare
Keyword(s):  
Large Scale ◽  
South Australia ◽  
Rock Lobster ◽  
Directed Movement ◽  
Translocation Event ◽  
South West ◽  
Movement Dynamics ◽  
Close Proximity ◽  
Jasus Edwardsii ◽  
Almost All

Previous movement studies on the southern rock lobster (Jasus edwardsii) have all involved releasing tagged animals at the point of capture. In 2007, 5298 lobsters, in total, were tagged and translocated from an offshore site (>100-m depth) to two inshore sites (<20-m depth) in South Australia. After a period of 735 days, 510 (9.6%) had been recaptured. The majority of translocated lobsters were located within close proximity to the release points, with 306 (60%) having moved <5km. Of the remainder, 133 (26%) were recaptured within 5–10km, with a further 71 (14%) individuals having moved >10km. Movement patterns were highly directional in nature, with individuals consistently travelling in a south-west bearing, regardless of distance moved. In almost all cases, movement was from inshore to offshore sites, with female lobsters travelling significantly further (mean 5.66km ±6.41s.d.) than males (mean 5.02km ±9.66s.d.). The results are consistent with previous large-scale tagging studies of J. edwardsii, which indicated high residency levels but with occasional directed movement by some individuals.

Social development and human rights - child labour in aquatic products production and processing.

2020 ◽  
Author(s):  
Monir
Keyword(s):  
Human Rights ◽  
Social Development ◽  
National Economy ◽  
Penaeus Monodon ◽  
Macrobrachium Rosenbergii ◽  
International Market ◽  
Poor People ◽  
Seed Collection ◽  
Aquatic Products ◽  
Coastal Aquaculture

Abstract Shrimp plays a significant role in the development of the national economy of Bangladesh. Farmers in Bangladesh have chosen bagda (Penaeus monodon) for coastal aquaculture due to its high export value in the international market. Therefore, coastal poor people have collected wild bagda post-larvae (PLs) for the last two decades. It is estimated that about 12,890 children are permanently and/or temporarily engaged in shrimp seed collection in greater Barisal and Khulna districts, of whom 76% (9,750) are girls and 24% (3,140) are boys. In Cox's Bazar and greater Noakhali districts, 1,590 children are engaged in this job, with 21% (340) girls and 79% (1,250) boys. Another 10,000 children are involved in shrimp and fish catching, sorting and drying in Dublarchar island, located 170 km south of Khulna city. It is also located 180 km from the Mongla port in Bagerhat district which is used as a fish landing centre. In addition, more than 1,500 children are also engaged in collecting snails and clams, which are used as a popular feed, particularly for galda chingri (Macrobrachium rosenbergii).

scholarly journals Stocking density for freshwater prawn Macrobrachium rosenbergii (Decapoda, Palaemonidae) in biofloc system

2017 ◽  
Vol 45 (5) ◽  
pp. 891-899 ◽  
Author(s):  
Celma Negrini ◽  
Cecilia Silva de Castro ◽  
Ana Bittencourt Guimaraes ◽  
Amabile Frozza ◽  
Rafael Ortiz Kracizy ◽  
...  
Keyword(s):  
Macrobrachium Rosenbergii ◽  
Stocking Density ◽  
Freshwater Prawn

Studies on the life-cycle of Pleurogenoides ovatus Rao, 1977 (Trematoda: Pleurogenetinae)

1991 ◽  
Vol 65 (1) ◽  
pp. 43-50 ◽  
Author(s):  
K. P. Janardanan ◽  
P. K. Prasadan
Keyword(s):  
Life Cycle ◽  
Growth And Development ◽  
Freshwater Snail ◽  
Prepatent Period ◽  
Paddy Fields ◽  
Freshwater Crab ◽  
Connective Tissues ◽  
Life Cycle Stages ◽  
Rana Tigrina

ABSTRACTThe life-cycle of Pleurogenoides ovatus Rao, 1977, infecting the frogs, Rana tigrina and R. cyanophlyctis has been elucidated. All the life-cycle stages from egg to egg-producing adults were successfully established in the laboratory. The life-cycle took about 80 days for completion. Cercariae were found in the freshwater snail, Digoniostoma pulchella, collected from paddy fields at Chelembra, Malappuram district of Kerala, during the monsoon months. Cercariae are of the virgulate xiphidiocercous type. Metacercariae occurred in the connective tissues, hepatopancreas and musculature of the freshwater crab, Paratelphusa hydrodromous. The growth and development of the metacercariae in P. hydrodromous have been studied in detail. Frogs became infected when they fed on infected crabs. The prepatent period is 10 days.

Chemical composition of some inland surface waters in South, Western and northeren Australia

1976 ◽  
Vol 27 (3) ◽  
pp. 379 ◽  
Author(s):  
WD Williams ◽  
RT Buckney
Keyword(s):  
Western Australia ◽  
Surface Waters ◽  
Major Ions ◽  
South Australia ◽  
Northern Australia ◽  
Low Salinity ◽  
South West ◽  
Yorke Peninsula ◽  
Standing Waters ◽  
Almost All

Numerous analyses of the major ions in surface waters of South Australia, south-western Western Australia, and northern Australia are presented and discussed. In South Australia three regions were investigated: the Yorke Peninsula, the Snowtown area, and the extreme south-east including the Coorong. In all three areas salinities were high, except for Lake Alexandrina and Lake Albert at the mouth of the River Murray, and sodium and chloride were the dominant ions. In rivers and standing waters in the south-west of Western Australia sodium and chloride were likewise the dominant ions. Almost all standing waters sampled in this region were saline and salinity was also high in some rivers investigated; there are, nevertheless, freshwater lakes and rivers of low salinity in this region. In running and standing waters of northern Australia, salinities were low and there was no consistent pattern of ionic dominance.

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