Now showing items 1-5 of 5

    • Book

      Abalone hatchery 

      AC Fermin, MR de la Peña, RSJ Gapasin, MB Teruel, SMB Ursua, VC Encena II & NC Bayona - 2008 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Aquaculture extension manual; No. 39
      This manual contains information on abalone hatchery operation, including site selection, design, culture of natural food, broodstock management, spawning, nursery, packing and transport, and profitability analyses.
    • Book chapter

      Evaluation of feedstuffs and aquafeeds 

      MB Teruel - In OM Millamena, RM Coloso & FP Pascual (Eds.), Nutrition in Tropical Aquaculture: Essentials of fish nutrition, feeds, and feeding of tropical aquatic species, 2002 - Aquaculture Department, Southeast Asian Fisheries Development Center
      This chapter discusses how to evaluate feedstuffs and feeds. The results of feed evaluation will be used to ensure the production of high quality feeds for fish, crustaceans, and shellfish.
    • Article

      Linoleic (ω6) and linolenic (ω3) acids in the diet of fingerling milkfish (Chanos chanos Forsskal) 

      MB Teruel & MC de la Cruz - Aquaculture, 1988 - Elsevier
      Feeding trials were conducted to determine the effects of linoleic acids on growth, survival, fatty acid composition and liver histology of milkfish. Five isocaloric semi-purified diets were formulated, either lipid-free or containing the following lipids: 7% lauric acid (LA), 6% LA + 1% linoleic, 6% LA + 1% linolenic acid, and 6% LA + 0.5% linoleic + 0.05% linolenic acids, and fed to milkfish with an average weight of 1.55 ± 0.25 g. there were no significant differences in growth or survival between fish fed the lipid-free and the LA diets in the five treatments tested. However, growth of fish fed with linoleic and linolenic acids was significantly higher (P<0.05) than that obtained in fish fed lipid-free and LA diets. The best growth response (233%) was attained with fish fed linolenic acid alone. Fatty acid analyses of the total lipid showed that lipid-free and LA diets increased the levels of monoenoic acids in the fish. The addition of linoleic and linolenic acids, alone or in combination, suppressed the levels of these monoenes and increased the levels of polyunsaturated fatty acids (PUFA). Histological analyses using light microscopy revealed slight abnormalities in the hepatocytes of fish fed lipid-free and LA diets. Both linoleic and linolenic acids are effective for good growth and survival of fingerling milkfish; however, the effect of linolenic acid on the growth of this species is better than that of linoleic acid.
    • Conference paper

      Processing of alternative feed ingredients in aquaculture feed 

      MB Teruel & B Glencross - In MR Catacutan, RM Coloso & BO Acosta (Eds.), Development and Use of Alternative Dietary Ingredients or Fish Meal Substitutes in Aquaculture Feed Formulation … Ingredients or Fish Meal Substitutes in Aquaculture Feed Formulation, 9-11 December 2014, Nay Pyi Taw, Myanmar, 2015 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Fish meal and fish oil have been used worldwide in aquaculture feed formulations. Production of these ingredients has been relatively constant for decades. However, supplies of industrial fisheries are limited, and unlikely to be able to support increasing demand for these products for a growing aquaculture industry. Finding alternative ingredients therefore, is necessary to address the long-term sustainable growth of aquaculture globally, thereby meeting projected increases in consumer demand for safe, high quality farmed aquatic food. Potential alternative ingredients have been identified, mostly coming from plant-derived nutrient sources, such as seeds, grains, leaves and other agricultural by-products. The use of these alternative ingredients however, may cause anti-nutrient inclusion in the feedstuffs that may interfere with feed utilization and affect the health and production of farmed aquatic products. To get rid of these anti-nutrients, and at the same time improve their nutritive value, various processing techniques (e.g. soaking, moist/dry heat treatment, chemical treatment, dehulling, fermentation), among others may be applied to these ingredients prior to use. Specific obstacles to the use of these ingredients will be the type of treatment, processing procedures and methods required to enhance the nutritive value of the product.

      Proper evaluation of processed feed ingredients in consideration of factors such as ingredient characterization and functionality, digestibility, palatability, nutrient utilization and/or interference of utilization, influence on immune status and organoleptic qualities, and economic viability need to be done to support their potential effective use in diet formulation. These alternative feed ingredients may offer sound potential when used in the right application.

      The priorities and future directions of feed manufacturing and researches on alternative feed ingredients with application of proper processing procedures are discussed in this report. The correct use of alternative ingredients with proper application of the right processing techniques may confer significant nutritional and technical advantages to the feed design and management process and may result in high quality feeds for healthy sustainable aquaculture.
    • Article

      Use of thraustochytrid Schizochytrium sp. as source of lipid and fatty acid in a formulated diet for abalone Haliotis asinina (Linnaeus) juveniles 

      MR de la Peña, MB Teruel, JM Oclarit, MJA Amar & EGT Ledesma - Aquaculture International, 2016 - Springer Verlag
      The effects of using thraustochytrid Schizochytrium sp. as source of lipid and fatty acids in a formulated diet on growth, survival, body composition, and salinity tolerance of juvenile donkey’s ear abalone, Haliotis asinina, were investigated. Treatments consisted of diets either containing a 1:1 ratio of cod liver oil (CLO) and soybean oil (SBO) (Diet 1) or thraustochytrid (Diet 2) as source of lipid and fatty acids at 2 % level. Natural diet Gracilariopsis heteroclada (Diet 3) served as the control. No significant difference in growth was observed in abalone fed Diet 3 (SGR: 5.3 % BW day−1; DISL: 265 μm day−1) and Diet 2 (SGR: 5.2 % BW day−1; DISL: 255 μm day−1). Survival ranged from 78 to 85 % for all treatments and was not significantly different from each other. A 96-h salinity stress test showed highest survival of 84 % in abalone fed Diet 2 compared with those fed diets 1 and 3 (42 %). The high growth rate of abalone fed Diet 2 and high tolerance to low salinity could be attributed to its high DHA content (8.9 %), which resulted to its high DHA/EPA ratio of 10.5 %. These fatty acids play a significant role in abalone nutrition. The fatty acid profile of abalone meat is a reflective of the fatty acid profile of the oil sources in the diet. The present study suggests that the use of Schizochytrium oil in lieu of CLO and SBO can support good growth of abalone which is comparable with abalone fed the natural seaweeds diet.