• Login
    View Item 
    •   SAIR Home
    • SEAFDEC Aquaculture Department
    • Journal Articles, Conference Papers and Book Chapters by AQD Staff
    • View Item
    •   SAIR Home
    • SEAFDEC Aquaculture Department
    • Journal Articles, Conference Papers and Book Chapters by AQD Staff
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Population dynamics of the calanoid copepod, Acartia tsuensis in a brackish-water pond in the Philippines

    Thumbnail
    View/Open
    https://www.jstage.jst.go.jp/article/fishsci1994/68/sup1/68_sup1_341/_pdf

    EXTERNAL LINKS DISCLAIMER

    This link is being provided as a convenience and for informational purposes only. SEAFDEC/AQD bears no responsibility for the accuracy, legality or content of the external site or for that of subsequent links. Contact the external site for answers to questions regarding its content.

    If you come across any external links that don't work, we would be grateful if you could report them to the repository administrators.

    Request this document in case the link we provided don't work.
    Date
    2002
    Author
    Golez, Ma. Salvacion N.
    Ohno, Atsushi
    Toledo, Joebert D.
    Tanaka, Yuji
    Ishimaru, Takashi
    Metadata
    Show full item record
    Share
    
    
    Abstract
    The occurrence pattern and population dynamics of Acartia tsuensis were investigated in a brackish-water pond in Panay Island in central Philippines by implementing both bi-monthly and daily sampling schemes. A. tsuensis occurred in the pond during the dry season (November-April) when the salinity of the water is in the range of 14 ~ 40 ppt but was completely absent at lower salinities. An almost constant rate of development from the nauplius 2 through to copepodite 5 stages of A. tsuensis was observed both in the pond and in the laboratory. The generation time ranged from 5.9~11.3 days. Fecundity had a positive linear corelation with chlorophyll a. Salinity and chlorophyll a affect the stage duration, mortality, and fecundity of A. tsuensis in the pond.
    URI
    http://hdl.handle.net/10862/1929
    Citation
    Golez, M. S. N., Ohno, A., Toledo, J. D., Tanaka, Y., & Ishimaru, T. (2002). Population dynamics of the calanoid copepod, Acartia tsuensis in a brackish-water pond in the Philippines. Fisheries Science, 68(Suppl. 1), 341-344.
    Publisher
    The Japanese Society of Fisheries Science
    Subject
    Freshwater crustaceans; Ponds; Population dynamics; Zooplankton; Population dynamics; Salinity; Fecundity; Mortality; Acartia tsuensis; Calanoida; Philippines; Generation time; Stage duration
    Type
    Article
    ISSN
    0919-9268
    Collections
    • Journal Articles, Conference Papers and Book Chapters by AQD Staff [1384]

    Related items

    Showing items related by title, author, creator and subject.

    • Thumbnail
      Article

      Effect of some vertebrate and invertebrate hormones on the population growth, mictic female production, and body size of the marine rotifer Brachionus plicatilis Müller 

      WG Gallardo, A Hagiwara, Y Tomita, K Soyano & TW Snell - Hydrobiologia, 1997 - Springer Verlag
      Eight vertebrate and invertebrate hormones were screened for their effect on population growth, mictic female production, and body size of the marine rotifer Brachionus plicatilis. Growth hormone (GH) or human chorionic gonadotropin (HCG) at 0.0025-25 I.U. ml-1 and estradio1-17β (E2), triiodothyronine (T3), 20-hydroxyecdysone (20-HE), 5-hydroxytryptamine(5-HT), gamma-aminobutyric acid (GABA) or juvenile hormone (JH) at 0.05-50 mg l-1 were added to 5-ml of Nannochloropsis oculata suspension (7 x 106 cells ml-1). From an initial density of 1 individual ml-1, rotifers were cultured with hormones for 48 hours in 22 ppt seawater at 25 °C, in darkness. Rotifers were counted and classified into female types and transferred to a new algal food suspension without hormone every other day until day 8 when body size was measured. Population growth was significantly higher in treatments exposed to GABA (50 mg l-1), GH (0.0025 and 0.025 I.U. ml-1), HCG (0.25 and 2.5 I.U. ml-1), and 5-HT (5 mg l-1). E2 caused a decrease in population growth, whereas JH, 20HE, and T3 had no effect. Mictic female production was significantly higher at 0.05 and 0.5 mg l-1 JH and 0.05 and 5 mg l- 5HT. GH (0.0025 and 0.025 I.U. ml-1), E2 (50 mg l-1 ), GABA (0.5, 5 and 50 mg l-1), and 20-HE (0.05 mg l-1) treatments had significantly higher mictic female production only on day 8, 6, 4, and 6, respectively. T3 and hCG had no effect on mictic female production. Lorica length increased by 9.6% and 4.4% in rotifers treated with JH (0.05 mg l-1) and GABA (5 mg l-1), respectively. Correspondingly, lorica width increased by 8.9% and 2.6% in these treatments. In comparison, 20-HE-, T3-, and HCG-treated rotifers were smaller (3.9-8.2%) and GH, 5-HT and E2 had no effect on rotifer body size.
    • Thumbnail
      Conference paper

      Mangroves as mud crab habitats 

      JH Primavera - In ET Quinitio, FD Parado-Estepa & RM Coloso (Eds.), 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, 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
      The paper reports the use of mangroves by Scylla species both as wild and culture habitats. Based on published literature, natural mangrove crab populations are described in terms of population density, dispersal and movement within and outside mangroves, crab burrows and associated mangrove species. Strategies for Scylla conservation depend on the kind of mangrove habitat - (mangrove) restoration for open fringing mangroves where crab recruitment and abundance are determined by habitat availability vs stock enhancement in closed basin mangroves with restricted recruitment and limited movement of crabs.

      Mangrove crabs are also reared in monoculture in mangrove cages and pens, or in polyculture with milkfish in extensive ponds (where mangroves used to thrive). The paper describes a SEAFDEC Aquaculture Department study to evaluate the effects of mud crab net pen systems on mangrove macroflora, and the replacement of dietary trash fish with low-cost pellets. Results showed that incomplete, low-cost pellets can replace fish biomass requirement in mud crab diets, but that crab presence resulted in fewer mangrove seedlings and saplings. Economic analysis showed the viability of crab culture in mangrove pens using a combination of fish biomass and pellets to reduce the requirement for (low-value) fish, which is a food item of poor coastal communities.
    • Thumbnail
      Article

      Seasonal abundance, distribution and recruitment of mud crabs (Scylla spp.) in replanted mangroves 

      ME Walton, L Le Vay, JH Lebata, J Binas & JH Primavera - Estuarine, Coastal and Shelf Science, 2006 - Elsevier
      The abundance and distribution of mud crabs were studied in a replanted mangrove forest in Buswang, Aklan, Philippines. Two fishing gears, lift nets and bamboo traps, were used to monitor relative abundance of Scylla spp. populations from March 2002 to December 2003 inside the mangrove forest. A third gear, a stakenet set across a creek, was used to monitor crabs migrating out of the mangroves during the ebb tide. Scylla olivacea formed 99.3% and 70.3% of the catch in the mangrove and the stakenet, respectively. The percentage of Scylla tranquebarica increased from <1% in the mangrove catches to 29% in the stakenet. Scylla serrata was present at very low levels in both catches. The lack of modal progression in the size–frequency plots and the year-round catch rate of gravid females suggested that recruitment was constant throughout the year. Even though relative abundance decreased over the study period indicating that the stock is being over-exploited, mud crab production is more than equivalent to that of most natural mangroves.

    www.seafdec.org.ph
    library@seafdec.org.ph
    (63-33) 330 7088, (63-33) 330 7000 loc 1340
    (63 33) 330 7088
     

     

    Browse

    All of SAIRCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Library & Data Banking Services Section | Training & Information Division
    Aquaculture Department | Southeast Asian Fisheries Development Center (SEAFDEC)
    Tigbauan, Iloilo 5021 Philippines | Tel: (63-33) 330 7088, (63-33) 330 7000 loc 1340 | Fax: (63-33) 330 7088
    Follow us on: Facebook | Twitter | Google+ | Foursquare | Instagram
    Website: www.seafdec.org.ph | Email: library@seafdec.org.ph
    Contact Us | Send Feedback