Now showing items 13-32 of 3209

    • Article

      A comparative study of various extenders of milkfish, Chanos chanos (Forsskal) sperm preservation 

      S Hara, JT Canto Jr. & JM Almendras - SEAFDEC Aquaculture Department Quarterly Research Report, 1980 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Four chemical extenders in 7 different concentrations (potassium chloride, sodium chloride, glucose, sodium citrate, Ringer s solution, cow serum and milkfish (Chanos chanos) serum) were compared in the preservation of milkfish sperm. Results showed milkfish serum to be the most suitable of the various extenders tested. This may be attributed to suitable osmotic potential and/or presence of proteins which may have directly or indirectly influenced sperm viability. The effects of milkfish serum on the motility and fertilizing capacity of sperm at different durations of storage however need to be investigated.
    • Article

      A comparison between the catching efficiency of two milkfish fry collecting gears and their respective modifications 

      GF Quinitio & G Kawamura - SEAFDEC Aquaculture Department Quarterly Research Report, 1980 - Aquaculture Department, Southeast Asian Fisheries Development Center
      An experiment was conducted along the shore of Culasi, Antique in Panay to compare the milkfry (Chanos chanos) catching efficiency of the ordinary fry seine against its innovation and the ordinary sweeper against its 2 modifications. Results show that it is possible to replace the wings of the presently used sweeper and the ends of the fry seine with a coarse-meshed netting. This improvement decreases the water resistance of the gears and thus enables fry gatherers to use larger ones thereby giving more catch.
    • Article

      A preliminary study on the growth and survival of stunted and non-stunted milkfish fingerlings 

      MN Lijauco, EG Griño, DD Gerochi & EM Rodriguez - SEAFDEC Aquaculture Department Quarterly Research Report, 1978 - Aquaculture Department, Southeast Asian Fisheries Development Center
      A study was conducted comparing the growth of stunted and non-stunted milkfish.
    • Article

      A statistical index of growth condition in an aquaculture experiment 

      RH Tan & IE de Mesa - SEAFDEC Aquaculture Department Quarterly Research Report, 1980 - Aquaculture Department, Southeast Asian Fisheries Development Center
      A simple statistical index, for evaluating the condition of growth in an aquaculture experiment and indicating the extent of effect of any plausible rival hypothesis, is presented.
    • magazineArticle

      Abalone 

      AP Surtida - SEAFDEC Asian Aquaculture, 2000 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • Conference paper

      Abalone aquaculture for stock enhancement and community livelihood project in northern Palawan, Philippines 

      BJ Gonzales - In MRR Romana-Eguia, FD Parado-Estepa, ND Salayo & MJH Lebata-Ramos (Eds.), Resource Enhancement and Sustainable Aquaculture Practices in Southeast Asia: Challenges in Responsible Production … International Workshop on Resource Enhancement and Sustainable Aquaculture Practices in Southeast Asia 2014 (RESA), 2015 - Aquaculture Department, Southeast Asian Fisheries Development Center
      One of the interventions to feed the poorest of the poor fisheries sector in the country is the provision of livelihood in the form of mariculture of high value marine species. In the Philippines, livelihood in rural areas is largely linked to resource depletion, hence it is wise not only to provide livelihood to the community but also to encourage them to conserve and enhance the resources. As part of the revised R&D program, the Western Philippines University partnered with NGO and existing projects to embark on a community-based environment-concerned livelihood project, using hatchery bred abalone, although top shell was also considered for stock enhancement. This is in an on-going project thus, preliminary phases such as abalone production and cage-based grow-out as well as subsequent project plans will be discussed. The objectives of this study were to: (a) share the implementing experiences in this project, (b) identify success and failure drivers of the project, (c) explain the conceptual framework for the MPA-based stock enhancement to be used in this project, and (d) give recommendations to improve the implementation and ensure the success of the project.

      The following activities have thus far been conducted: (a) development of criteria for cage micro-site selection; (b) writing of proposal and provision of financial assistance for hatchery juvenile production through a partnership MOA; (c) presentation of site survey results to beneficiaries and stake holders; (d) conduct of trainings on abalone grow out culture to POs; (e) development and improvement of training module; (f) signing of conservation agreement; (g) giving of cage materials and juveniles to people s organizations; (h) on site coaching; and (i) partial monitoring. The next activities include improvement in juvenile production, conduct of researches on abalone nutrition, and development of market and value chain flow analysis. The conceptual framework for community-managed stock enhancement will follow that of the Department of Environment and Natural Resources-ICRMP, of which the stock enhancement project is anchored on the management of marine protected areas or MPAs.

      The steps in all the activities were documented and while the project was in progress, performance of the participants in training were measured, the training module was improved, the training approaches were revised according to needs, and the growth and survival of juvenile abalone were monitored. The problems identified were low production of juveniles, insufficient food for grow-out, political squabbles, social preparation, and delay in implementation schedule. Recommendations to improve or resolve the problems encountered were also presented in this paper.
    • Image

      Abalone culture 

      SMA Buen-Ursua - 2007 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Conceptualized by SM Buen-Ursua (Abalone Project).
    • magazineArticle

      Abalone culture: a new business opportunity 

      WG Gallardo & ND Salayo - SEAFDEC Asian Aquaculture, 2003 - Aquaculture Department, Southeast Asian Fisheries Development Center
      There are about 100 species of abalone in the world, but only 20 are of high commercial importance. In the Philippines, the abalone species are Haliotis asinina, H. varia, H. ovina and H.glabra, but it is the former which has high commercial value. The semi-processed abalone are frozen, dried or canned for export to many countries. An outline is given of the major aquaculture activities and duration of breeding and culture. Abalone hatchery production operations and investment costs and returns are detailed. Particular reference is made to the modular system of abalone culture in floating cages.
    • Conference paper

      Abalone culture: an emerging aquaculture technology 

      AC Fermin - In Fishlink 2001, 29-31 May 2001, Sarabia Manor Hotel, Iloilo City, 2001 - University of the Philippines Aquaculture Society
    • 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.
    • magazineArticle

      The abalone of the Philippines 

      MT Castaños - SEAFDEC Asian Aquaculture, 1997 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • magazineArticle

      Abalone R&D at AQD 

      MT Castaños - SEAFDEC Asian Aquaculture, 1997 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Details are given of the results of research conducted at the SEAFDEC Aquaculture Department on abalone (Haliotis asinina). The following areas are covered: reproductive biology; induced spawning; raising abalone in the hatchery; and, cage culture trials.
    • Brochure

      Abalone seed production and culture 

      Anon. - 2000 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Details the research conducted at AQD for the tropical abalone Haliotis asinina. AQD has developed the rudiments of a hatchery protocol.
    • magazineArticle

      [Abalone] markets, opportunities 

      MT Castaños & AP Surtida - SEAFDEC Asian Aquaculture, 1997 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • Article

      Abdominal segment deformity syndrome (asds) and fused body segment deformity (fbsd) in cultured Penaeus indicus 

      The abdominal segment deformity disease (ASDD) is a new shrimp disease reported only in cultured Penaeus vannamei in Thailand. Shrimp with ASDD have deformed abdominal segment, jagged gut line and bumpy surfaces. Similar signs were observed in cultured P. indicus in the Philippines. However, aside from the signs described for ASDD, some P. indicus showing abdominal segment deformity syndrome (ASDS) had more severe deformities up to the extent that the number of body segments was reduced due to fusion. Shrimp with fused body segment deformity (FBSD) had four instead of five pairs of legs. To account the prevalence of the deformities in P. indicus, shrimp were classified into grossly normal shrimp (NS), shrimp with abdominal segment deformity syndrome (ASDS) and shrimp with fused segments (FBSD). Out of the shrimp sampled, 83.4 ± 5.4% was NS, 10.9 ± 6.2% was ASDS and 5.7 ± 3.0% was FBSD. Morphometric characteristics of the shrimp were measured. There was no significant difference in body weight (BW) among male and female NS, ASDS and FBSD. In both sexes, total length (TL) of FBSD was significantly shorter compared to NS and ASDS. Shrimp samples were also screened to be negative for known infectious viral diseases including white spot syndrome virus (WSSV), infectious hypodermal and haematopoietic necrosis virus (IHHNV), infectious myonecrosis virus (IMNV), P. vannamei nodavirus (PvNV), Macrobrachium rosenbergii nodavirus (MrNV) and Taura syndrome virus (TSV). Occurrence of ASDS and FBSD in post-larvae (PL) produced from captive and wild spawners were also determined. Based on a tank experiment, no significant difference was detected between the percentages of ASDS in PL produced from wild or captive spawners but FBSD was only noted in PL produced from the latter. Deformities generally did not affect the size of P. indicus except for the reduced length of shrimp with FBSD which when coupled with missing pleopods could lead to major economic loss for shrimp farmers if not addressed properly.
    • Conference paper

      Ability of sandfish (Holothuria scabra) to utilise organic matter in black tiger shrimp ponds 

      S Watanabe, M Kodama, JM Zarate, MJH Lebata-Ramos & MFJ Nievales - In CA Hair, TD Pickering & DJ Mills (Eds.), Asia-Pacific tropical sea cucumber aquaculture. Proceedings of an international symposium held in Noumea, New Caledonia, 15-17 February 2011, 2012 - Australian Centre for International Agricultural Research
      Series: ACIAR Proceedings; No. 136
      Due to frequent viral disease outbreaks, a large proportion of shrimp aquaculture in South-East Asian countries has switched from black tiger shrimp (Penaeus monodon) to P. vannamei, an exotic species originally imported from Latin America. One of the causes of disease outbreaks is thought to be poor water and sediment conditions in the shrimp ponds, which may aggravate disease symptoms. To obtain basic information for co-culture methods of black tiger shrimp and sandfish (Holothuria scabra) for possible mitigation of shrimp-pond eutrophication and prevention of disease outbreaks, basic laboratory experiments were conducted at the Southeast Asian Fisheries Development Center—Aquaculture Department in Iloilo, the Philippines. A feeding trial of juvenile sandfish showed that they do not grow well with fresh shrimp feed on hard substrate. Another trial indicated that sand substrate enhances the growth of juvenile sandfish fed with shrimp feed. A feeding trial using shrimp tank detritus, shrimp faeces and Navicula ramosissima (a benthic diatom) as food sources showed that sandfish grew fastest with the faeces, followed by detritus and N. ramosissima. Dissolved oxygen consumption and acid-volatile sulfur levels in the shrimp tank detritus were reduced by sandfish feeding. This suggests that sandfish are capable of growing with organic matter in shrimp ponds, and can bioremediate shrimp-pond sediment.
    • Conference paper

      Acceptability of five species of freshwater algae to tilapia (Oreochromis niloticus) fry 

      JB Pantastico, JP Baldia & D Reyes Jr. - In CY Cho, CB Cowey & T Watanabe (Eds.), Finfish Nutrition in Asia : Methodological Approaches to Research and Development, 1985 - International Development Research Centre
      Unialgal cultures of Oscillatoria quadripunctulata, Chroococcus dispersus, Navicula notha, Euglena elongata, and Chlorella ellipsoidea were fed to tilapia fry for 30 days. Mean weights and survival rates of the fry were highest when given Navicula (105.6 mg, 86%) and Chroococcus (89.1 mg, 90%). Oscillatoria, a filamentous cyanophyte, showed limited acceptability to tilapia fry, possibly because of its larger size in comparison with Chroococcus. Fry fed Chlorella and Euglena did not survive at all.

      C14-labeled algae of the above species were fed to tilapia fry of varying ages. Assimilation rates per fry after 24 hours of feeding with a suitable algal species increased with the age of the fry. Moreover, the same trend as in the growth and survival experiments was observed, i.e., the highest assimilation rates were obtained in 40-day old tilapia fry given Navicula and Chroococcus as natural feeds. On the other hand, negligible amounts of the other three algal species tested were assimilated by tilapia fry.

      The above results were explained in terms of the enzyme secretion of tilapias. There seemed to be no transition stage in the feeding habit of both fry and adult tilapia. The acceptability of plant matter in the diet of even the early larval stages was demonstrated.
    • Conference paper

      Acceptability of selected zooplankton and phytoplankton for growing larvae/fry of bighead carp (Aristichthys nobilis). 

      SF Baldia, JB Pantastico & JP Baldia - In The China Society of Fisheries, 1990 - Proceedings of the Asian Symposium on Freshwater Fish Culture, 11-15 October 1985, Beijing, China
    • Article

      Acceptability of territorial use rights in fisheries: towards community-based management of small-scale fisheries in the Philippines 

      SV Siar, RF Agbayani & JB Valera - Fisheries Research, 1992 - Elsevier
      The granting of territorial use rights in fisheries (TURFs) to fisherfolk associations, similar to that practiced in Japan, is recommended as a management tool for small-scale fisheries in the Philippines. This study, carried out to determine the acceptability of the practice under Philippine conditions, was conducted among 211 coastal dwellers of five municipalities in Panay Island, Central Philippines. Respondents of the survey generally perceived the practice of TURFs as acceptable as it would lead to an improvement of their catch. Results suggest that the respondents' present predicament of inadequacy of catch to support their livelihood is the starting point for introduction of the rationale for community-based management of coastal marine resources.
    • Article

      Acclimation of Penaeus monodon postlarvae to fresh water 

      JB Pantastico & EN Oliveros - Fisheries Research Journal of the Philippines, 1980 - Fisheries Research Society of the Philippines
      Gradual acclimation of Penaeus monodon Fabricius to fresh water was conducted in glass aquaria and marine plywood tanks over a one-day, two-day, and three-day acclimation periods. Different stages of postlarvae were tested for their hardiness to acclimation. P35 postlarvae had a high percent survival of 98-99% while lower values were obtained for P20 and P90. A three-day acclimation period was favorable for all ages of postlarvae. Shorter durations of acclimation produced survival values as low as 20% This stress effect was apparent with P20 and P90 but not with P35 which showed high survival regardless of the length of acclimation.