Farming of giant freshwater prawn (Macrobrachium rosenbergii) in Bagerhat, Bangladesh - Journal of Fisheries

Journal of Fisheries
Volume 2 Issue 3 December 2014
Pages: 187-194

Farming of giant freshwater prawn (Macrobrachium rosenbergii) in Bagerhat, Bangladesh

Shirin Akter • Md. Mer Mosharraf Hossain • Sanjoy Banerjee Bappa • Bipul Kumar Dey • Md. Farid Uz Zaman

Department of Fisheries and Marine Bioscience, Jessore University of Science and Technology, Jessore-7408, Bangladesh

Article type: Original article

DOI: dx.doi.org/10.17017/jfish.v2i3.2014.38

Manuscript history

  • Received on 11 Jul 2014
  • Received in revised form on 16 Oct 2014
  • Accepted on 14 Nov 2014
  • Published online on 29 Nov 2014

Correspondance
Bipul Kumar Dey
Department of Fisheries and Marine Bioscience, Jessore University of Science and Technology
Email: bipulkumar.jstu@gmail.com

Citation
Akter S, Hossain MMM, Bappa SB, Dey BK and Zaman MFU (2014) Farming of giant freshwater prawn (Macrobrachium rosenbergii) in Bagerhat, Bangladesh. Journal of Fisheries 2(3): 187-194. DOI: dx.doi.org/10.17017/jfish.v2i3.2014.38

   
Table of contents
  > Abstract
> Introduction
> Methodology
> Results
> Discussions
> Acknowledgement
>
References
   
Abstract
The study was carried out to know the present status of Macrobrachium rosenbergii culture in Bagerhat district, Bangladesh from March 2012 to January 2013. Education levels  of farmers were found as illiterate (12.3%), primary (36.19%), secondary (20%), SSC (13.33%), HSC (12.38%) and graduate (5.71%). M. rosenbergii culture was the primary and secondary occupation of 80% and 20% farmers respectively. Average stocking density and production in extensive, improved extensive and semi-intensive culture were 9609, 11502 and 22847 per ha and 193, 284 and 488 kg/ha/year respectively; rearing period ranges from 6-10 months and survival rate varied from 55 to 60%. In improved extensive and semi-intensive culture 82.86% and 71.43% farmers applied farm-made feed instead of company feeds respectively, and 11.43% and 37.14% farmers used both feeds. 91.43%, 80% and 68.57% respondents responded on normal to high mortality in extensive, improved extensive and semi-intensive culture respectively. Lack of finance and appropriate technology, scarcity of quality PL, diseases and inadequate extension work were major problems of prawn culture.
   
Keywords
Bagerhat, Macrobrachium rosenbergii, culture, extensive, improved extensive, semi-intensive
 
[Top] [Table of contents]
Introduction

The giant freshwater prawn (Macrobrachium rosenbergii) is an importance aquatic crustacean species (Akand and Hasan 1992), mostly distributed in the tropical and subtropical regions (Abramo and Brunson 1996), abundant in the south-southeast Asia and Asia-pacific region (Akand and Hasan 1992). After its domestication in 60s, it has been gradually appeared as a major aquaculture species in many countries including Australia, Brazil, Honduras, Indonesia, Israel, Malaysia, Mauritius, Mexico, the Philippines, Viet Nam, United States of America (New 2002), China, India, Thailand, Vietnam and Ecuador and also in Bangladesh (Akand and Hasan 1992). Bangladesh has entered into the commercial prawn farming in early 90s and has become a world player as one of the seven export countries (Ahmed 2001). Three Asian countries (Bangladesh, Taiwan and Thailand), together with China, contributed 97% of world production of this species (FAO 2001).

Bangladesh is considered one of the most suitable countries in the world for giant freshwater prawn farming because of its favorable soil condition, weather and temperature (Paul 1997). Water pH mostly ranges from 7 to 8 and the water temperature often remains 28-32 °C during most times of the year, which are ideal for prawn culture (Asaduzzaman 2005). Culture practice of this species is increasing day by day (Shafi 2003) and culture area has been expanding on an average of 10-20% per annum (Williams and Khan 2001, DoF 2002, Khondaker 2007). For example, the prawn culture area extended from 6,000 ha in 1994 (Chanda and Khondaker 1994) to an estimated 50,000 ha (Khondaker 2007) and 56248 ha in 2010 (BFFEA 2010). Because of high growth rate (reach marketable size within a span of 3-4 months only), omnivorous feeding habits, accept variety of feeds, rich favorable flavor and taste, high nutritive value (Shafi 2003), high market value and increasing demand in abroad (DoF 2013) such as US and European market; especially Belgium, United Kingdom, Germany, Netherlands and Denmark (DoF 2012). During 2009-2010, Bangladesh exported 18% shrimp and prawn in USA, 17% in Belgium, 14% in UK, 10% in Netherland, 8% in Germany, 3% in Russia, 3% in Saudi Arabia, 3% in Japan and rest 24% in other countries. The EU countries import nearly 70% of the countries giant freshwater prawn, worth about 12000 million BDT (BFFEA 2010). Thus Bangladesh was the third largest global producer, producing 30636 T equating to 14% of global production of giant freshwater prawn in 2010 (FAO 2012). In Bangladesh, M. rosenbergii is cultured mainly in Bagerhat, Khulna, Jessore, Narail, Pirojpur and Gopalgonj district; some another considered districts are Barishal, Borguna, Potuakhali, Banalkati, Satkhira and Madaripur (Karim 1997).

In Bangladesh, giant freshwater prawn farming first started in the southwest region in the early 1970s (Mazid 1994) at Fakirhat sub-district in Bagerhat district (Abedin et al. 2001). In the late 1980s, prawn farming practise began to be adopted widely in the Fakirhat area, where prawns were grown along with fish including Indian major carps (Labeo rohita, Catla catla and Cirrhina mrigala) and exotic carps (Hypophthalmichthys molitrix and Cyprinus carpio) with rice (Kamp and Brand 1994). More than 70% (Muir 2003) or 75% (Ahmed et al. 2013) of prawn farms are located in the south-western part of Bangladesh. In 2008–2009, Bangladesh produced 26138 MT of prawns from different water bodies, while 90% of this production (23597 MT) was by aquaculture from south-western region (DoF 2010, Rahman 2010) but its global production in was 215029 MT in 2010 (FAO 2012). In recent years 95% shrimp and prawn farms are registered by the DoF (Department of Fisheries) with the help of BQSP- UNIDO. Now the number of registered prawn farms is 97845 with an area of 56248 ha (BFFEA 2010). In Bangladesh approximately 2000 million shrimp fry is collected annually from wild sources. With respect to fresh water shrimp (M. rosenbergii) more than 90% of the total for the PL is derived from natural sources (Banks 2003). Although there are 81 freshwater prawn hatcheries in Bangladesh, only 38 (47%) are operational. These hatcheries produce around 100 million PL per annum, equating to 20% of the total demand (Ahmed and Troell 2010).

Fisheries is an important subsector of agriculture as contributing 4.39% to national GDP and 22.76% to the agricultural GDP and 2.46% to foreign exchange earnings came from this sub sector in 2011-12 (DoF 2013). Giant freshwater prawn is an important product of this sub-sector as the highly valued product for international market and almost all Bangladeshi prawns are therefore exported (BFFEA 2010). As a result about 70% of the total production is exported to foreign markets and the rest (30%) is consumed locally (Paul 2008). During the fiscal year 2009-10, Bangladesh exported 80% shrimp and prawn products which accounts for 20% of fish (BFFEA 2010). Most of world production of M. rosenbergii is from aquaculture and world fisheries production of this species was 5500 MT in 1999, 5% of world fisheries production (FAO 2001). During the fiscal year 2010-11, Bangladesh exported 54891 MT of frozen and processed prawn and another shrimp species which price was 356.82 million BDT (DoF 2012) and commonly this species covers 25-30% of total exported prawn and shrimp species (DoF 2013). P. monodon comprises 60% of the firmed shrimp production, followed by the M. rosenbergii which accounts for 25% (Ahmed 1996).     

During the economic year, 2011-12, total production of giant freshwater prawn and another shrimp species was 239460 MT where 137175 MT came from farms (DoF 2013). But the production rate (300-500 kg/ha) of M. rosenbergii in Bangladesh is very low comparingwith the production of various countries of the world namely Japan, Thailand, Taiwan, Malaysia, produce giant freshwater prawn at 4000-8000 kg/ha, but different prawn and/or shrimp experts stated that the soil quality, climatic condition and temperature of Bangladesh is very suitable for the culture of this species (Ali et al. 2009). However, the progress of prawn farming is slow in the northern and north-central regions because of inadequate extension services, lack of technical knowledge of farmers on prawn farming and poor supply of PL (Ahmed 2011) but Bangladesh plans to produce 60000 MT of prawns from 80000 ha of farms by 2015 (Karim 2011), when the production was 30636 MT in 2010 (FAO 2012) and 23240 MT from around 50000 ha farm area (Wahab et al. 2012).

The production rate of giant freshwater prawn in Bangladesh is very low, indicating that there are some problems and/or limitations in culture. So this case study was conducted in Bagerhat district as a valuable region of M. rosenbergii culture, to know about the present status of culture practice and to identify the problems and limitations.
[Top] [Table of contents]
Methodology

Study area and duration: The coastal area lies in the alluvial plains of Bangladesh between 89.00o E and 92.20o E in the northern and north-eastern part of the Bay of Bengal (Brown 1997). The study area, Bagerhat district is lies between 89’30” and 90’00” E. The case study was carried out in Bagerhat Sadar, a sub-district of Bagerhat district, a well-known shrimp and prawn production zone in the south-western part of Bangladesh (Figure 1). The total area of this district is 3959.11 km2 and Bagerhat Sadar retains 272.73 km2 and thus the study area covered 6.89% area of Bagerhat district and the duration of the study was March, 2012 to January, 2013.


Figure 1:
Map of Bagerhat district, Bangladesh, indicating the case study area by red circle (source: Banglapedia)

Sampling framework: Sample farms were selected randomly emphasizing on various culture strategies (extensive, improved extensive, semi-intensive). These culture strategies were categorized by following the categorizing keys (Table 1), emphasizing the stocking density. Stocking density were categorized as <12000 PL/ha, +12000-<18000 PL/ha and +18000-<25000 PL/ha respectively in extensive, improved extensive and semi-intensive culture strategies. In every culture strategy 35 farmers were included that means 105 farmers totally. Primary data were composed employing effective techniques such as personal interview (home visit), focus group discussion (FGD), and telephonic interview and farmers were interviewed to collect the present culture techniques, production rate, diseases and other constraints in culture of giant freshwater prawn. The present diseases were identified by applying disease identifying keys (Table 2). Secondary data were collected from various government and fisheries correlated institutions and also collected from websites and published literatures.

Table 1: Identifying keys for culture methods
Table 1: Identifying keys for culture methods

Table 2: Disease identifying keys
Table 2: Disease identifying keys

The equations were used for inference of percentage of various factors are as follows:

Percentage (%) of specifically educated farmer=


Percentage (%)  of occupation of farmers=


Percentage (%) of specifically involvedness of farmer=

Data analysis: The collected data were subjected to descriptive analysis by means of the computer software, Microsoft Excel 2007.
[Top] [Table of contents]
Results
 

Farmers’ contour: The education levels of farmers were categorized into six types such as illiterate, primary, secondary, SSC (Secondary School Certificate), HSC (Higher Secondary Certificate), and graduate. Among these education levels, primary school level education was found at highest portion (36.19%) and lowest portion (5.71%) in graduate (Figure 2). Among the interviewed farmers, 80% were involved in prawn culture as their primary occupation and 20% as their secondary occupation and the farmers which were educated under SSC level, doses of various chemicals and feed were not properly measured by considering the water volume and/or other considering measures. The maximum, minimum and average farming experience of farmers were 25, 3 and 13 years respectively.

Figure 2: Education level at different farmers
Figure 2:
Education level at different farmers

Pre-stocking management: Most of the farmers performed partial pre-stocking management measures and in some cases it was absent (Table 3). Farmers applied organic and/or inorganic fertilizers and lime from pond preparation to final harvest in farms although the application rate differed from farmer to farmer in various culture systems (Table 4). Monoculture was not practiced in extensive culture and in semi-intensive culture, no integrated (rice-fish-prawn/rice-prawn) culture was recorded.

Table 3: Pre-stocking management status in different culture strategies
Table 3: Pre-stocking management status in different culture strategies

Table 4: Liming and fertilization rate in surveyed farms
Table 4: Liming and fertilization rate in surveyed farms

Stocking management: Most of the farmers especially in extensive and improved extensive culture strategies did not perform the acclimatization process before releasing the PL. According to their statement, 55-60% survivility was gained in different culture system and stocking rate also differs (Table 5).

Table 5: Stocking management status of surveyed farms
Table 5: Stocking management status of surveyed farms

Post-stocking management: Mostly the farm-made feed was used in maximum farms instead of commercial feeds (Table 6). Water quality parameters were not checked in maximum farms and a great portion of farms was susceptible to various diseases those caused death of cultured species (Table 7) but did not take any strong protective measure without some exception in semi-intensive strategy.

Table 6: Responding rate of farmers based on feed types and present diseases
Table 6: Responding rate of farmers based on feed types and present diseases

Table 7: Disease prominence in surveyed area
Table 7: Disease prominence in surveyed area
[Top] [Table of contents]
Discussions
 

Education is a vital factor in every sphere of life also in aquaculture. In the present study, the farmers which acquired below SSC level education are error performers in calculation of doses and rates respectively of chemicals and feeds but they occupy the major portion (total 68.49%) of the farmers. Because of high market value and increasing demand in abroad (DoF 2013), 80% farmers commercially culture M. rosenbergii as primary occupation and the rest 20% farmers considers as secondary occupation. According to Samad et al. (2014),95% was found practicing prawn farming on commercial basis, where as 5% was found as non-commercial in Avaynagar Upazilla of Jessore district, Bangladesh.

In pre-stocking management in study area, a great portion of farmers mainly in extensive and improved extensive farming strategies not perform all of the pond preparation measures although major portion of farmers use lime but the lowest liming was at 24.67 kg/ha/year in extensive and at 143.33 kg/ha/year in semi-intensive culture strategy but according to Hasanuzzaman et al. (2011), sometimes farmers were reported to use lime at the rate of 105.68 kg/ha/year and in Avoynagar upazilla, Bangladesh, it was at 232.18 kg/ha/year (Samad et al. 2014). In the study it was found that, 94% (highest) of farmers practiced bottom tilling for paddy cultivation in integrated culture (rice-prawn and/or rice-fish-prawn) and 28.57% (lowest) in mixed culture (fish-prawn) belonging to improved extensive culture strategy, although tilling helps to mix the lime and fertilizer with the soil during pond preparation and thus increases the productivity of land by increasing the natural food (FAO 2002).

Among the responded farmers, fear of disease was existed associated with the use of organic fertilizers. As a result they limited the use of organic fertilizers; it was the similar finding to Wahab et al. (2011). This was found that, in case of mixed culture belonging to semi-intensive culture, average application of organic fertilizer at the rate of 18.82 kg/ha/year (lowest) and in integrated culture belonging to the extensive culture strategy it was at 71.60 kg/ha/year (highest); here is a dissimilarity with the findings of Ahmed (2001) and Hasanuzzaman et al. (2011) when the application of organic fertilizers were respectively at the rate of 1500 kg/ha/year and 410.22 kg/ha/year but according to Ahmed (2013) it was at 100-150 kg/ha/year. In case of inorganic fertilization, in the present study, average use of inorganic fertilizers was at 208.07 kg/ha/year (highest; emphasizing the paddy culture) in integrated culture occupying the extensive culture strategy and at 83.54 kg/ha/year (lowest) in case of monoculture occupying the improved extensive culture strategy. That is around the rate, stated by Ahmed (2013) and Hasanuzzaman et al. (2011) respectively at 45-85 kg/ha/year and 180.34 kg/ha/year.

Average stocking density of PL (post larvae) varies in extensive, improved extensive and semi-intensive culture strategies respectively at 9609 PL/ha, 11502 PL/ha and 22847 PL/ha in the study area, which is also in line with a density of 1500-15000 PL/ha reported by Alam et al. (2007), and a density of 7411-39520 PL/ha reported by Barmon and Karim (2007). According to Ahmed et al. (2008a), prawn farmers practiced a stocking density of 19830-21155 PL/ha. The average stocking densities were found to be 30000/ha (2.5 PL/m2) in semi-intensive farming, 20000 (2.0 PL/m2) in improved extensive and 15000 (1.5 PL/m2) in extensive systems (Ahmed 2013) that is higher than the stocking density recorded in the present study.

In the three culture strategies, 5.71%, 48.57% and 71.43% farmers perform the acclimatization consciously, correspondingly in extensive, improved extensive and semi-intensive culture strategies, where the assumed survival rate was correspondingly <55%, <60% and <60%, it is closely similar to the survival rate 50 to 60% that was found by Ahmed et al. (2008a, b).

Stocking period of PL ranges from 6-10 months in study area and the average production was lowest in extensive culture, that was 193 kg/ha/year and in that order 284 kg and 488 kg/ha/year in improved extensive and semi-intensive culture strategies but according to (DoF 2010), the yield ranges from 400-500 kg/ha/year. These production rates are lower than other prawn producing countries, such as China, India, Taiwan, Thailand and Vietnam (Weimin and Xianping 2002; Raizada et al. 2005; Vicki 2007). It has reported that the present level of annual prawn production can be increased to 1500-2500 kg/ha/year through the application of advanced technologies (Katalyst 2009).

It was estimated that, greater part (82.86%) of farmers apply farm-made feed  in improved extensive and 71.43% in semi-intensive, similar findings was stated by Ahmed (2001), who said that farmers use home-made feed like cooked rice, fried rice, rice bran, boiled wheat, wheat bran, maize, boiled papaya and roots of arum, chick peas and fish meal. This statement is also similar to the report of Barmon et al. (2006) and Ahmed et al. (2008b), who reported snail-meat used commonly in prawn farming system. Responded farmers in this study usually do not supply the feeds in extensive culture strategies but 11.43% farmer use both of the feed types in improved extensive culture and in semi-intensive culture that was estimated as 37.14%. Ahmed (2001) stated that farmers also often use commercial pelleted feed for better prawn growth. Farm-made aqua feeds and industrially manufactured pelleted feeds are used by improved extensive and semi-intensive farmers respectively (Ahmed 2013); in this study it was found that, in both culture strategies a small amount of farmers use both feed types. Generally a great portion of farmers do not use the commercial feeds because of its high price but low quality. There is a similarity that, the majority of the respondents (53%) reported that high feed price was the single most important constraint regarding their use of commercially manufactured pelleted feeds (Ahmed 2013).

Among the responded farmers, 91.43%, 80.00% and 68.57% are respond to various present diseases correspondingly in extensive, improved extensive and semi-intensive culture strategies. Mac Rae et al. (2002) stated that disease is a common and major problem of prawn farming in Bangladesh, and a wide variety of diseases are found including shell diseases or black spot, white spot and gill disease. White spot syndrome virus, black gill, soft shell, broken antenna, black/brown spot and nutritional deficiency disease are noticed by the great portion of interviewed farmers those are occurred more or less throughout the year and cause normal to very high intensity of death of M. rosenbergii in farms. Cai et al. (1997) also said that, black spot, the most widespread disease of prawn from post larvae to harvest size, causing mass mortalities and losses in the aquaculture industry. Bacterial necrosis, a common disease observed in adult prawns, was recorded from rice-prawn farming systems during August to December, 2002 that was reported by Te and Tam (1994).

Bagerhat district is famous for shrimp and prawn culture in Bangladesh but there are many existing problems in farming due to absence of remarkable extension work. On the other hand lack of finance, lack of technology supply and PL scarcity during proper stocking period are other important problems. So these problems should be mitigated to increase the production rate.
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