Improved production of mud crabs Scylla serrata in marine pens with used tires and bamboo tubes as shelters
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One serious problem in mud crab farming systems is cannibalism and low survival, but this can been offset by provision of shelters. Two types of shelters were tested on mud crabs grown in bamboo pens set in a mangrove area in Tiniguiban Cove in Puerto Princesa. Six pens, each 3 m x 3 m in area, were built side by side (the whole array 9 m x 6 m in area). Two pens were provided bamboo tubes, two had used tires, and two had both shelter types. The bamboo tubes were about 46 cm long and 13 cm in diameter, open on both ends, and each with a node retained as partition. The bamboo tubes were laid in one layer at the middle of the pens, 48 tubes in each of the two pens. The used tires were 50 cm in diameter, placed 20 cm apart in one layer in the middle of the pens, 12 tires in each of two pens. In the two pens that had both shelter types, half the number of bamboo tubes and used tires were laid out. All shelters were tied and did not move off the bottom. Juvenile crabs of 46 g body weight were stocked at 63/pen or 7/m2. The crabs were fed chopped trash fish at 5% of body weight daily at 0800 h and 1600 h. Mud crabs in the pens with bamboo tubes as shelters had the best survival (79%), weight gain (81 g), net production (4.5 kg/pen), and feed conversion ratio (4.9), as well as net income (P544,202/ha-yr) and return on investment (48%). The results clearly indicated that bamboo tubes were better shelter for juvenile mud crabs than used tires. Bamboo tubes were presumably more familiar to mud crabs reared in bamboo pens. Having node partitions in the middle, the bamboo tubes had smaller and safer hiding places. These shelters effectively reduced crowding, aggression, and cannibalism, and thus increased the survival and growth of mud crabs. The used tires evidently did not provide a good shelter configuration nor sufficient protection for mud crabs in bamboo pens.
Basaya, M. C. (2007). Improved production of mud crabs Scylla serrata in marine pens with used tires and bamboo tubes as shelters. In T. U. Bagarinao (Ed.), Research Output of the Fisheries Sector Program (Vol. 2. Reports on Fisheries and Aquaculture, pp. 150-151). Quezon City, Philippines: Bureau of Agricultural Research, Department of Agriculture.
PublisherBureau of Agricultural Research, Department of Agriculture
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Conference paperB Sirikul, S Luanprida, K Chaiyakam & R Sriprasert - In JV Juario & LV Benitez (Eds.), Seminar on Aquaculture Development in Southeast Asia, 8-12 September 1987, Iloilo City, Philippines, 1988 - Aquaculture Department, Southeast Asian Fisheries Development CenterAquaculture practised in Thailand is in the form of pond culture and cage culture in freshwater, brackishwater and coastal areas. The main species cultured include freshwater prawns, brackishwater shrimp, cockles, mussels, and various freshwater and marine finfishes. There is good potential for increased production from freshwater, brackishwater and marine aquaculture. However, the 1983 production of 145 000 mt represents only about 6% of Thailand's total fish production and production in this subsector has fluctuated widely. It will be several years before aquaculture production will contribute substantially to total production. Nonetheless, the culture of high value species of shrimp and fish could contribute significantly to export earnings during the next 5 to 10 years. Conducted primarily by government agencies, research and development are along the lines of increasing seed supply, establishing new culture techniques or improving older ones. The Department of Fisheries (DOF) together with some private companies have ventured into the development and testing of artificial diets for the various cultured species using a variety of indigenous feed stuffs. It is estimated that with adequate investments and appropriate support, aquaculture production will increase from 145 000 mt in 1983 to 378 000 mt in 1991, showing an annual increase of about 13% over this period. Major increases would come from bivalve mariculture (131 000 mt), brackishwater ponds (36 000 mt) freshwater ponds (46 000 mt) and brackishwater cage culture (20 000 mt).