2,526 research outputs found
Review of SEAFDEC/AQD finfish seed production research
No full textResearch on seed production of several foodfishes has been a continuing activity of SEAFDEC/AQD since 1976. Fry and juvenile production methods of these fish commodities are in various stages of advancement. For instance, advances in the development of hatchery rearing, particularly feeding and water management schemes, have made mass production of milkfish (Chanos chanos) seed a reality, resulting further in the application of the technology in commercial hatcheries. Recent studies now focus on assessing the quality of hatchery seed stocks of milkfish vis-a-vis wild seed during nursery and grow-out culture. Likewise, sea bass (Lates calcarifer) seed production has undergone significant improvements since the technology was introduced in the Philippines in 1982. Fatty acid-enrichment of a zooplankton diet can enhance growth and survival of sea bass fry, although other cheaper alternatives and early weaning to formulated diet preparations are currently being tested. Hatchery fry production of grouper (Epinephelus salmoides and E. suillus syn. E. coioides) and snapper is in its infancy, but trials complemented by research on their larval feeding habits and requirements are underway to establish reliable methods of rearing larvae of these species. Although fairly well-established, seed production of rabbitfish (Siganus guttatus) requires further improvement in determining an appropriate zooplankton diet to ensure adequate growth and survival of larvae. Hatchery fry production of tilapia (Oreochromis sp.), carps (Aristichthys nobilis, Hypothalmichthys molitrix) and, to a certain extent, catfish (Clarias macrocephalus) can already be categorized as a flourishing industry in some parts of the Philippines. Nonetheless, SEAFDEC/AQD continues to conduct research on these freshwater species, with particular emphasis on nutrition and feed development during the nursery production phase. Together, results of past and on-going research studies ensure that seed supply of these important foodfishes become adequate and sustainable for the grow-out
Shrimps
No full textDuring 1988-1991, research at the Aquaculture Department of SEAFDEC on the shrimp Penaeus monodon has been directed towards a) the development of captive broodstock, b) the refinement of hatchery and grow-out techniques, c) the development of diets for the various stages of culture, and d) the prevention and control of diseases. Biochemical, morphological, and histological characterization of the male and female reproductive systems were conducted to provide basic information for the development of techniques for pond-reared broodstock. Studies on the refinement of hatchery techniques included determination of the environmental and feeding requirements of larvae and postlarvae to serve as basis for the improvement of management practices. Refinement of grow-out techniques included studies on the physiological response of this species to vital environmental factors and studies on the role of natural food organisms during culture. Nutrition studies have resulted in the formulation, testing, and improvement of diets for broodstock, larvae and postlarvae, juveniles, and subadult shrimps. Methods of prevention and control of the luminous bacterial disease, chronic soft shell syndrome, aflatoxicosis, monodon baculovirus (MBV) infection, and other relevant diseases have been investigated through the identification of causative agents and bioassay of possible chemo-therapeutants.
Studies to improve larval rearing of alternative shrimp species such as P. indicus, P. merguiensis, and P. japonicus have likewise been pursued. Nutritional requirements of the white shrimp species were evaluated to develop suitable formulated feeds for the different culture stages
Effects of different fat sources on the egg quality of grouper, Epinephelus suillus
No full textAbstract only.The effect of different fat sources on the egg quality of grouper, Epinephelus suillus eggs was evaluated. Fish in three tanks, each containing 3 females and 1 male, were fed various types of feeds namely: trash fish (control), trash fish + cod liver oil (treatment 1) and trash fish + SELCO, a lipid emulsion containing high levels of highly unsaturated fatty acid (HUFA) (treatment 2).
Approximately 77.9 million eggs spawned from January to October 1992 by the control group, 40.0 million by fish in treatment 1, and 36.4 million by the treatment 2 group. Egg production (0.45 million eggs/kg BW) among the control group was significantly higher than treatment 2. Egg production of treatment 1 (0.06-0.36 million eggs/kg BW) was not significantly different (P treatment 1 > treatment 2. There were no differences detected in the egg and oil globule diameters among the treatments. Crude protein and lipid levels of floating (good) and sinking (bad) eggs collected in February to March 1992, and August to September 1992 were similar in all treatments. Unfed larvae from treatment 1 survived until the fifth day after hatching while those in the control and treatment 2 groups lasted only until the third day. These results suggest that supplementation of cod liver oil and SELCO in the trash fish diet of E. suillus broodstock does not influence egg production, fertilization and hatching rates, and egg quality
The commercial production of green grouper fingerlings, Epinephelus suillus, from wild caught fry - an industry experience
No full textWild-caught fry of the green groupers, Epinephelus malabaricus and E. suillus ranging in standard lengths (SL) from 1.5 to 3.0 cm were bought from different fry dealers all over the Philippines. These were reared from 1.0 to 2.5 months in 10 to 40 m3 (small) concrete tanks, in 240 m3 (large) concrete nursery tanks with sandy bottom, in 10 m3 hapa nets installed either in large nursery concrete tanks with sandy bottom or in 0.8 to 1.0 ha earthen ponds. The initial stocking density was 33-150/m3. When the fingerlings reached 5 to 7 cm SL, these were harvested and stocked in cages. The wild fry were fed adult brine shrimps for the first few days and later, trash fish. Rearing water in small concrete tanks was changed daily while that in large nursery tanks and hapas was changed only when dissolved oxygen level was about 4 ppt or lower. Survival rates ranged from 3% to 64%. Although survival rates varied, rearing grouper fry in hapa nets installed in earthen ponds were found to be the most suitable for the commercial production of grouper fingerlings to a size suitable for stocking in cages. The large variation in survival rates is attributed mainly to the quality of wild fry bought from different fry dealers all over the country and the occurrence of diseases during the culture period. The problems encountered in the commercial production of fingerlings are discussed
Successful use of cryopreserved oyster trocophores as a live first feed larval marine fish and invertebrates
No full textTrochophore-stage larvae of the Pacific oyster Crassostrea gigas were cryopreserved in bulk and stored in liquid nitrogen for periods up to two years before thawing and feeding to a variety of warmwater and coldwater larval marine fish, as well as to marine shrimps and other invertebrates. The commercial product ("TrochoFeed"), marketed in both pre-thawed and cryopreserved versions, has been used successfully in the early rearing of cultured species including red drum, snook, grouper, and black cod, as well as for numerous warmwater and coldwater aquarium display fish.
This paper describes the nutritional profile of the cryopreserved trochopores and presents a summary of the available growth and mortality data
Gerald Gorman
No full textPhorograph - Gerald Gorman in traditional Scottish clothing, (Edinburgh, Scotland). A note with the picture reads: "Hoot Mon", The Canadian Kid. Sincerely Yours, Gerald Gorma
Gerald Nelson discusses article "Do roads cause deforestation?"
No full textIFPRI Senior Researcher, Gerald Nelson, discusses the article, "Do roads cause deforestation." On July 25, 2011, Nelson and co-author, Daniel Hellerstein, were honored by the AAEA with the Publication of Enduring Quality Award for this innovative 1997 publication on techniques for turning satellite imagery into economic data
Morphological deformities in mud crab Scylla serrata juveniles exposed to antibiotics during the larval stage
No full textAbstract only.The effects of antibiotics on the survival, growth and external deformities of mud crab Scylla serrata larvae and juveniles were determined. Zoeae were exposed to 0, 3, 6, 9, 12 mgL-1 oxytetracycline (OTC) and 0, 0.5, 1, 1.5, 2 mgL-1 furazolidone (furan) until the late megalopa in the first and second experiments. The treatments that gave the best results in the first and second experiments were conducted simultaneously in the third experiment. The surviving crab instar from each replicate were grown in nursery tanks for one month.
Significantly higher survival and faster growth rate of Z5 were attained when 3 and 6 mgL-1 OTC or 0.5 and 1 mgL-1 furan were used. Morphological deformities observed in zoea 5 were bent dorsal, rostral and furcal spines. Percentage occurrence of morphological deformities was similar in all treatments. Significantly (P-1 OTC and 0.5 mL-1 furan in the third experiment. Morphological deformities observed in juveniles were fused frontal and lateral spines, asymmetrical and depressed tip of abdominal flap and gap between sternites. High percentage of deformities was observed in juveniles that were previously exposed to 6 mgL-1 OTC or 1.0 mgL-1 furan. There was no significant difference (P>0.05) observed in the survival of juveniles in both treatments of OTC and furan. However, growth was significantly (P<0.05) faster in lower concentrations of the two antibiotics.
The study shows the apparent negative effects of antibiotics and highlights the need to eliminate or find alternatives, thereby preventing possible harm to the organisms and the environment
Portrait of President Gerald Ford.
No full textHandwritten Inscription: \u27To Felton M. Johnston - best always, Gerald Ford\u27https://egrove.olemiss.edu/fmjohnston/1097/thumbnail.jp
Philippines : in the forefront of the mud crab industry development : proceedings of the 1st National Mud crab Congress, 16-18 November 2015, Iloilo City, Philippines
No full textThe Organizing Committee of the First National Mud Crab Congress gratefully acknowledges the management of SEAFDEC/AQD and the PCAARRD of the DOST for the wholehearted support and encouragement before and during the conduct of this Congress. The members of the different Committees are also acknowledged for doing a good job. Thanks are also due to the moderators, rapporteurs, participants and presentors. We would also like to thank BNH, Tateh Aquafeeds, Nanosys International, Inc., MFC Muti-species Hatchery and Agri-farm, CDO, Palawan Aquaculture Corporation, Iloilo Faith Enterprises and Manpower Services, Inc., Integrated Services for the Development of Agriculture and Fisheries, Inc. and Tierra Organia for their participation and sponsorship. We thank the Publications Review Committee members for their valuable inputs for the improvement of the Proceedings. Our gratitude to Mr. Sid Tendencia and Ms. Chaya Lavilla for the cover design, and to Ms. Gelyn Faigani and Ms. Rossea Ledesma for the lay-out of the Proceedings. The assistance of Ms. Juliette Virgula in compiling the files of this Proceedings is acknowledged. Collapse All Expand All FOREWORD ACKNOWLEDGEMENTS PHOTO OF THE PARTICIPANTS A. Technical Papers Overview of the Mud Crab Industry in the Philippines - Emilia T. Quinitio Husbandry Recent Developments and Enhancing Transfer of the Nursery Technology for the Mud Crab Scylla serrata - Fe D. Parado-Estepa, Veronica Alava, Esteban Garibay, Churchill Bejemino, Jony Sumile, Jenalyn Silvestre and Emilia T. QuinitioManagement Strategies for Grow-out Culture of Mud crab - Jerome G. GenodepaDevelopment of Protocol for the Production of Hatchery-reared Mud Crab Scylla serrata Juveniles for Soft-shell Crab Farming - Emilia T. Quinitio, Gardel Xyza Libunao and Fe D. Parado-Estepa Feeds and Feeding Management Breeding and Culture of the Polychaete Marphysa mossambica as Feed for the Mud Crab Scylla serrata Broodstock - Veronica R. Alava, Joseph B. Biñas and Mary Anne E. MandarioNursery Culture of Mud Crab Scylla serrata Using Different Feeding Rates - Veronica R. Alava, Jony D. Sumile and Fe D. Parado-EstepaNursery Culture of Mud crab Scylla serrata Using Different Ratios of Natural Food to Formulated Feed - Veronica R. Alava, Jony D. Sumile and Fe D. Parado-EstepaEffect of Feed Binder on Water Stability and Digestibility of Formulated Feed for the Mud Crab Scylla serrata - Mae R. CatacutanBiological Evaluation of Existing Feed Formulations for the Grow-out Culture of the Mud Crab, Scylla serrata - Mae R. Catacutan Diseases Diseases Affecting Wild and Farmed Mud Crab in the Philippines - Eleonor A. Tendencia and Ma. Venuz C. Cabilitasan Aquasilviculture Mangrove Structure and Mud Crab Population in Northern Samar - Emilia T. Quinitio, Evelyn B. Vista, Rafael C. Vista and Ma. Junemie Hazel Lebata-RamosMangroves as Mud Crab Habitats - Jurgenne H. Primavera B. Papers on Industry Practices Trading of Juvenile Crabs and Grow-out Culture in Capiz - Graciano Jalemar Panaguiton Polyculture of Mud Crab in Region 3 - Maurino Bonifacio Mud Crab Fattening Project of KAMAMANA in Del Carmen, Siargao Island - Agapito E. Sulima Capacity Building Initiatives of Winrock International on Mud Crab Culture in the Caraga Region - Joselito Nobillos, Daniel Gudahl and Jim Orprecio Mud Crab Marketing Practices - Alain G. Decembrana Enforcement of the Unified Provincial Fisheries Law in Camarines Norte with Focus on Mud Crab - Edgar A. Estanislao Philippine National Standard for Live Mud Crabs: Establishing Food Safety and Quality Requirements - Mark F. Matubang, Teresita S. Palomares, Jose P. Peralta, Emilia T. Quinitio, Rosario J. Ragaza, Julieta V. Alejo, Prescilla B. Regazpi, Cherry E. Romero, Haydee Ann Montoya, Jaypee G. Trinidad and Karen Kristine A. Roscom C. Abstracts of Other Presented Papers (Oral and Poster) Biology, Genetics and Ecology Identification of Mud Crab Species in Coastal Areas of Pangasinan - Rolando B. Cerezo and Mariel C. Tapia Genetic Diversity and Stock Delineation of Philippine Populations of the Orange Mud Crab, Scylla olivacea - Faith Jessica M. Paran and Rachel June Ravago-Gotanco Population Structure of Scylla serrata from Microsatellite and mtDNA Markers - Chona Camille E. Vince Cruz and Ma. Carmen Ablan-Lagman High Throughput RNA Sequencing Reveals Temperature Tolerance Mechanisms in Scylla serrata - Ma. Carmen Ablan-Lagman and Eli Meyer Husbandry Updates on the Larviculture of Mud Crab at SEAFDEC/AQD - Emilia T. Quinitio, Joana Joy Huervana, Juliette C. Virgula and Fe D. Parado-Estepa Mud Crab Scylla serrata Hatchery Operation - Mario Santos and Francisco Santos Mud Crab Production Trials at the College of Fisheries and Marine Sciences, Aklan State University, New Washington, Aklan - Yasmin H. Primavera-Tirol, Ronnie de la Cruz and Eduardo B. Pastrana Initiatives on Mud Crab Culture at the Palawan Aquaculture Corporation - Elsie Tech, Cheryl Emboltorio, Domingo Galila, Cornelio Ogsimer and Kimberly Lim Induction of Molting in Hatchery-reared Mud Crab Scylla serrata Juveniles Through Temperature Manipulation or Autotomy - Joana Joy D.C. Huervana, Valeriano L. Corre Jr. and Emilia T. Quinitio Morphological Deformities in Mud Crab Scylla serrata Juveniles Exposed to Antibiotics During the Larval Stage - Gaudioso S. Pates Jr., Emilia T. Quinitio, Gerald F. Quinitio and Fe D. Parado-Estepa Nursery Culture of Mud Crab Scylla serrata Fed Diets Supplemented with Tryptophan at Two Stocking Densities - Veronica R. Alava, Marjorie Aijee Lucero, Jony D. Sumile and Fe D. Parado-Estepa Adoption of Modified Commercial Scale Mud Crab Hatchery and Nursery Systems in Alaminos, Pangasinan - Rolando B. Cerezo and Jesamine F. Rebugio Private Sectors Perspectives: Problems and Constraints of Mud Crab Grow-out Industry - Herbert Renan Hocson Feeds and Feeding Management Growth, Survival, Proximate and Fatty Acid Composition of Sandworm Perinereis quatrefagesi (Grube, 1878) Fed Variable Feed Types - Joseph B. Biñas, Veronica R.Alava and Wilfredo L. CamposEvaluation of the Bioremediation Capacity of the Polychaete, Marphysa mossambica (Peters, 1854) in Pond Sediments - Mary Anne E. Mandario, Veronica R. Alava and Nathaniel C. Anasco Nursery and Grow-out Feeding Management Approach of Mud Crab Farmers in the Philippines: Santeh Management - Julius Remar A. Gabiota Pilot Scale Production of Pellets Suitable for Mud Crab Scylla serrata - Relicardo M. Coloso, Mae R. Catacutan, Jose P. Peralta, Jerome G. Genodepa, Khrsha Duno and Rosthon Gardoce Diseases Strategies to Reduce Disease Incidence in Mud Crab - Edgar C. Amar, Mechil D. Somera, Sherlyn B. Madero, Eleonor A. Tendencia and Joseph P. Faisan, Jr. Development of Immunostimulant for Mud Crab, Scylla serrata - Rex Ferdinand Traifalgar Post harvest Defects in the Handling, Storage and Transport of Mud Crab - Jose P. Peralta and Dominique S. Cheung Handling, Storage and Transport Conditions of Mud Crab in Trading Centers - Jose P. Peralta and Justin Paul D. Chan Aquasilviculture Enhancing Mud Crab Population through Mangrove Restoration - Ma. Junemie Hazel Lebata-Ramos, Ellen Flor Doyola-Solis, Rema C. Sibonga, Joseph B. Biñas, Mark Walton and Lewis Le Vay Development of Aquasilviculture at BFAR-NBFTC, Pagbilao, Quezon - Romeo E. Dieta and Florida C. Dieta Implications of Mud Crab Culture Technology Transfer on Rural Coastal Communities: The Case in Northern Samar, Philippines - Didi B. Baticados, Renato F. Agbayani and Emilia T. Quinitio D. Workshop Output E. Resolution F. Annexes 1. List of Participants 2. Composition of Committees </div
- …
