Browsing by Author "Borlongan, I. G."
Conference paperIG Borlongan, CL Marte & J Nocillado - In CL Marte, GF Quinitio & AC Emata (Eds.), Proceedings of the Seminar-Workshop on Breeding and Seed Production of Cultured Finfishes in the Philippines, Tigbauan, Iloilo, Philippines, 4-5 May 1993, 1996 - Aquaculture Department, Southeast Asian Fisheries Development CenterA preliminary feeding experiment was conducted to determine growth and survival of milkfish larvae reared on various feeding regimes involving the use of artificial diets. Two larval diets (Feed A and Feed B) containing 45% protein and 10% lipid were fed either alone or in combination with Brachionus from day 8 to day 21. The feed in the control treatment were Brachionus (10 ind/ml) from day 8 to day 14 and Artemia (2-3 ind/ml) from day 15 to day 21. Larvae in all treatments were fed Brachionus (10 ind/ml) from day 2 to day 7. No significant differences were observed in survival rates, total length, wet weight and dry weight among fish fed combination of Brachionus and Feed B and the control feed (Brachionus and Artemia). These promising results indicate the possibility of using Feed B as partial replacement or supplement to live food. However, lowest survival rates, total length, and weight were obtained in fish fed either Feed A or Feed B alone, indicating that the test artificial diets given solely to milkfish larvae starting from day 8 can not support good growth and survival. Further studies on the development of improved artificial diets for larval milkfish need to be done.
Conference paperIG Borlongan & RM Coloso - In SS De Silva (Ed.), Fish Nutrition Research in Asia. Proceedings of the Fifth Asian Fish Nutrition Workshop, January 1993, Udorn Thani, Thailand, 1994 - Asian Fisheries SocietyThe protencial of partial replacement of fish meal protein with protein indigenous leaf meals in practical diets for milkfish, Chanos chanos (Forsskal) was studied. Five isocaloric (375 kcal/100 g diet), isonitrogenous (40% protein), and isolipidic (10%) diets were formulated to contain leaf meals from either swamp cabbage (kangkong, Ipomea reptans), sweet potato (kamote, Ipomea batatas), ipil-ipil (Leucaena leucocephala), and cassava (kamorng kahoy, Manihot esculenta), or a combination of swamp cabbage, sweet potato and cassava. The control diet contained fish meal and soybean meal as sources of protein while thw test diets contained fish meal, soybean meal, and leaf meals erplacing 15% of the fish meal protein. The protein sources were incorporated in levels that gives optimal essential amino acid patterns to the diets. Each diet was fed to reiplcate groups of fish (about 0.3 g) maintained at 20 ppt salinity and 29oC in a recirculating system for twelve weeks. Growth, feed conversion ratio (FCR), protein efficiency ratio (PER), and survival of fish fed the diet contaning cassava leaf meal showed the best groth FCR, PER and survival. the data sugest that these leaf meals can be used to partially replace fish meal in a diet for juvenile milkfish if the requirments for essential amino acids are met.
Conference paperIG Borlongan, RM Coloso & RA Blum - In IF Henderson (Ed.), Slug and Snail Pests in Agriculture. Proceedings of a Symposium organized by The British Crop Protection Council … and The Malacological Society of London, held at the University of Kent Canterbury, UK on 24-26 September 1996, 1996 - British Crop Protection CouncilMETAR metaldehyde formulations were tested under laboratory and faild conditions againts brackishwater pond snails (certhium so.). Under laboratory conditions the LC50 and LC99 3 days after treatment ranged from 2 - 3.5 and 4.8 - 5.4 kg/ha, respectively. However. these levels proved inffection when applied directly under actual pond conditions. In ponds with snail populatin of about 300/m2, a higher application rate of 30 kg/ha is recommended. Application of META metaldehyde concentrations of 0 - 175 kg/ha did not affect milkfish juveniles (1 - 3g body weight) 7 days after treatment. Results suggest that META metaldehyde formulations were effective for pond snail control without detrimental effect on juvenile milkfish.