CURRENT STATUS OF EXPLOITATION, CONSUMPTION AND CULTURE OF BLACK APPLE SNAIL (Pila polita) IN MEKONG DELTA
Le Van Binh1* & Ngo Thi Thu Thao1
1 College of Aquaculture & Fisheries, Cantho University, Campus II, 3/2 street, Cantho City, Vietnam
*Corresponding author: lvbinh654@gmail.com
An assessment of the status of exploitation, consumption and culture of black apple snail (Pila polita) in the Mekong Delta was conducted from April to October 2019, using the questionnaire to survey the total of 138 cases including managers, snail farming, exploiting and purchasing householders. The results showed that black apple snails distributed in the stagnant water higher than in the flow through water or in the rice field. Black apple snails stay at the surface waters in the evening and early morning at a depth of 60-150 cm. The snail density and production gradually decreased over last decade, especially from 2015 to the present. The fishing season was mainly in the rainy season from May to October with the average yield of 9.54 kg/household/day (equivalent to 1717 kg/household/year). Most of harvested snails were sold to small-scale retail dealers (70.8%), local consumers (20.0%) and large-scale retail dealers (9.2%). Average surface area of snail farming was 294.5 m2 per household with the survival rate of 66.0% and harvested size of 25-35 snails/kg, and the mean productivity obtained 1.40 kg/m2.
Keywords: Black apple snail, Consumption, Exploitation, Mekong Delta
COMPARISION OF TECH ICAL AND FINANCIAL ASPECTS BETWEEN SUPPER INTENSIVE WHITE LEG SHRIMP ((Litopenaeus vannamei Boone, 1931) IN LINED ROUND AND SQURE PONDS IN BAC LIEU PROVINCE
Tran Duong Linh1 and Truong Hoang Minh2*
1Student of College of Aquaculture and Fisheries, Can Tho University
2College of Aquaculture and Fisheries, Can Tho University, Campus 2, 3/2street, Can Tho City, Viet Nam
*Corresponding author: thminh@ctu.edu.vn
The study was carried out in three super intensive white leg shrimp lined round ponds in Long Manh company and three square ponds in Agricultural Hi-Tech cooperation (AHT) Bac Lieu province from December 2021 to July 2022 through monitoring and recording data and interviewing the owner and culture zone manager of the company as well as AHT Cooperation on technical and financial parameters. The results showed that the round and square pond areas were 850 m2/pond and 1.250 m2/pond, respectively. Stocking densities were 188 inds./m2 and 160 inds./m2. Culture period were 102 days/crop and 105 days/crop, respectively Feed conversion rate (FCR) in round and square ponds were 1.2 and 1.5 respectively. Harvest size in the two ponds were 55 inds./kg and 36 inds./kg. The yield of round and square ponds were 2.67 tons/1000 m2/crop and 4.17 tons/1000 m2/crop. Total cost of the round pond was 228.3 VND million/1000 m2/crop lower significantly than that of square pond (401.7 VND million /1000 m2/crop) (p<0.05). The profit rate of round pond was 1.40 time lower than that of square pond (1.51 time).
Keywords: Bac Lieu, Finance, Square pond, Supper intensive, Round pond, Technique, White leg shrimp
COMPARISION THE EFFICIENCY PRODUCTION BETWEEN CERTIFIED AND NON-CERTIFIED ORGANIC MANGROVE SHRIMP FARMING SYSTEMS IN CA MAU PROVINCE
Bui Van Du1 and Truong Hoang Minh2*
This study was carried out in Nhung Mien Mangrove Forest Protection and Management Enterprise, belong to Minh Phu Cooperation, Ca Mau province from August to December 2021 through direct interview 30 certified and 30 non-certified organic mangrove shrimp farmers (CF and NCF), 5 staffs of Mangrove Forest Units, 3 staffs and 05 district officers and 3 provincial officers of Fishery Management Division. The results showed that total area of CF and NCF were 4.24 and 5.35 ha/household, surface water areas were 2.23 and 3.57 ha and mangrove areas were 45.5 and 32.1%, respectively. Stocking time and density were 5.43 times/year and 5.83 times/year and 16.48 inds/m2 and 18.42 inds/m2 in CF and NCF, respectively. Yields of black tiger shrimp, mud crab, natural fish and shrimp were significantly difference between the two farming systems. Total cost and production cost of CF was lower significantly than NCF, respectively 43.8 VND million/ha/year and 60.66 VND million/ha/year. Production efficiencies and shrimp selling price of certified organic shrimp farms were higher than that of non-certified organic shrimp farms.
Keywords: Ca Mau, certified organic shrimp, finance, mangrove shrimp, non- certified, technique
STATUS OF BIVALVE CULTURE IN TANINTHARYI REGION, MYANMAR
Aung Aung Aye1*, Shwesin May1, Aung Aye Latt1, Cherry Aung1
1Marine Science Department, Myeik University, Myanmar
*Corresponding author: aungaungaye2009@gmail.com
The shellfish industry in Myanmar especially in Tanintharyi Region is fairly well developed in both the capture and culture sectors. Its include pearl oyster, edible oyster, clam, cockles and mussels. Pearl oyster culture is one of the commercially important industry since 1978 and Myanmar’s pearl production is very well known especially East Asia region. The culture of other bivalves is in developing stage from small scale to commercial scale as of its high demand by both local and international markets. Total annual mollusk production, species diversity, status of culture, hatcheryand growth out culture status, socio-economic important and distribution of bivalves were determined in the present study. Pearl Island, Thayawthaetnagyi Island, Panataung village, Kyauk phyar village and Kyuak Kar village were the case study sites. Questionnaire survey and FGD interviews to the local bivalve farmer and companies were carried out.
Keywords: Bivalves, clam, cockles, edible oyster, mussel, pearl oyster, Tanintharyi Region
SOCIO-ECONOMY RELATING THE MUD FLAT FISHERIES AT GULF OF MOTTAMA, MYANMAR
Cherry Aung
Marine Science Department, Myeik University, Myanmar
Corresponding author: missaungmarine@gmail.com
An investigation on the socio-economy related with the mud flat fisheries in the mud flat area of Gulf of Martaban (Mottama) has been carried out. The area is situated at the Thanlwin River Mouth having extensive mud flat providing habitats for a large variety of organisms. The bottom dwelling benthic organisms in the mud flat are subjected to be the main source of food for aquatic, terrestrial fauna and avifauna as well. The species composition and abundance of benthic organisms, related fisheries and its socio-economic value was studied. Transect lines methods were used to collect the samples. Regarding the benthic organisms, a total of 34 species under 11 taxa were recorded including polychaetes, crabs, insects, amphipods, slugs, bivalves, gastropods, nemartines, fishes, platyhelminthes, and hemichordates. The small size crabs, Dotilla intermedia are represented as the most abundant species in the area followed by polychaetes, Notomastus sp. and insect larva, Dolichopodidae. The highest abundance of crabs was observed in lower level of the flat and the quantity up to 300 ind/m2 was observed in some sampling stations. Highest abundance of Insect larva and worms are also found in winter and that of pike conger (bait worms) was in monsoon. According to have high biodiversity and abundance of benthic organisms in the mud flat, the area is subjected as the important wintering ground for thousands of shorebirds.
Key words: Benthic organisms, Gulf of Mottama, mud flat fisheries, Thanlwin River