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  • Book

    Biology and hatchery of mangrove crabs Scylla spp. 

    ET Quinitio, FD Parado-Estepa & JJ dela Cruz-Huervana - 2018 - Aquaculture Department, Southeast Asian Fisheries Development Center
    Series: Aquaculture extension manual; No. 34
    This manual includes the biology of crab (Scylla serrata, S. tranquebarica, and S. olivacea), and describes principles and procedures for spawning the mature crabs and rearing the zoea to ‘fly’ size crabs. It focuses on the hatchery rearing of S. serrata as the farming of this species is more economically viable than the two other species. The techniques may be modified depending on the conditions or problems encountered in a specific site.
  • Report

    SEAFDEC/AQD Highlights 2017 

    Southeast Asian Fisheries Development Center, Aquaculture Department - 2018 - Aquaculture Department, Southeast Asian Fisheries Development Center
    SEAFDEC/AQD Highlights 2017 is SEAFDEC/AQD’s annual report updating on its accomplishments and progress for the year 2017.
  • Newsletter

    AQD Matters 2018 January - February 

    RH Ledesma (Ed.) - 2018 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 2018 May - June 

    RH Ledesma (Ed.) - 2018 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 45th Anniversary Special Issue 

    RDB Dianala (Ed.) - 2018 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 2018 July - August 

    JMV de la Cruz (Ed.) - 2018 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 2018 March - April 

    JMV de la Cruz (Ed.) - 2018 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 2017 January - February 

    JMV de la Cruz (Ed.) - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Book

    SEAFDEC/AQD Highlights 2016 

    Southeast Asian Fisheries Development Center, Aquaculture Department - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
    Highlights 2016 is SEAFDEC/AQD’s annual report updating on its accomplishments and progress for the year 2016.
  • Newsletter

    AQD Matters 2017 March - April 

    RH Ledesma (Ed.) - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 2017 November - December 

    JMV de la Cruz (Ed.) - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Book

    Diseases of juvenile and adult mud crab Scylla spp. in the Philippines 

    EA Tendencia, MVC Cabilitasan & E Tobias-Quinitio - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
    Series: Aquaculture extension manual; No. 64
    This manual aims to provide updated information on the diseases of mud crabs initially authored by Lavilla-Pitogo and dela Peña (2004). It includes the name of the disease, causative agent, stages affected, effects on mud crab and methods of prevention and control. Except for the infectious diseases caused by viruses, which can be detected through molecular methods, most of the diseases can be visually diagnosed. Photographs of the external and internal anatomy of a normal mud crab, including the different sexes and species are included to help readers differentiate a normal from a diseased mud crab.
  • Newsletter

    AQD Matters 2017 May - June 

    GK Faigani (Ed.) - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 2017 July - August 

    JMV de la Cruz (Ed.) - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Newsletter

    AQD Matters 2017 September - October 

    RH Ledesma (Ed.) - 2017 - Aquaculture Department, Southeast Asian Fisheries Development Center
  • Conference paper

    Biological evaluation of existing feed formulations for the grow-out culture of the mud crab, Scylla serrata 

    MR Catacutan - 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
    This study was conducted to identify a formulated pelleted feed for the grow-out culture of the mud crab. A commercial crab feed (CCF) was evaluated together with fish by-catch (FBC) and three test diets (formulated and pelleted) of similar dietary energy (1723 MJ/Kg diet) based on published works. The test diets contained 48% (D-1), 43% (D-2), and 38% (D-3) crude protein (CP), respectively. All the five dietary treatments were fed to crablets (5 to 6 g body weight) that were individually stocked in 60-L tanks. Each dietary treatment was fed to six crabs. Crustaceans grow by molting which is not simultaneous, hence, each crab was monitored daily. After the third molt (M3) survival rates in D-1, D-2 and D-3 ranged from 33%-66% compared with only 16% in FBC, and 0% in CCF where no crab survived to molt for the second time (M2). Nutrients in FBC may not be sufficient to sustain growth and survival, while water stable CCF may lack a feed attractant. Diets D-1, D-2, and D-3 were evaluated in another feeding experiment to identify the basal diet for the crab. All crabs molted until M3 and no significant differences were noted on growth performance between treatments. However, D-1 (48% CP) was identified as the basal diet due to better numerical values observed in terms of feed conversion ratios and specific growth rates.
  • Conference paper

    Trading of juvenile crabs and grow-out culture in Capiz 

    GJ Panaguiton - 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 article presents the trade of juvenile crabs in the Province of Capiz, Philippines. Moreover grow-out culture was also presented. Likewise, common problems encountered in the trade, and culture of the crabs was discussed.
  • Conference paper

    Recent developments and enhancing transfer of the nursery technology for the mud crab Scylla serrata 

    FD Parado-Estepa, V Alava, E Garibay, C Bejemino, J Sumile, J Silvestre & ET Quinitio - 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 development of hatchery techniques for seed production of mud crab is expected to address the present problem on the depletion of wild seedstock supply for stocking in grow-out ponds. The nursery serves as the link between the two phases of culture as this involves growing of juvenile crabs produced in the hatchery to sizes that are suitable for stocking in the ponds.

    Nursery rearing involves the use of net cages installed in ponds as holding system for ease in harvest and retrieval of crabs. In the first nursery phase, 0.3-0.5 cm carapace width (CW) juvenile crabs are reared to 1.5-2.0 cm CW for 3-4 weeks and stocks are harvested for selling or are grown further in a second nursery phase in which crabs reach 2.5-3.0 cm after another 3-4 weeks. This paper includes a review of techniques initially developed for the nursery and more recent refinements which involve the use of higher crab instar densities, provision of suitable shelters, trimming of claws and sorting. In addition, production results in farms of collaborators are presented to highlight the efficiency of dissemination and also discusses the challenges faced by the potential nursery industry.
  • Conference paper

    Philippine National Standard for Live Mud Crabs: establishing food safety and quality requirements 

    MF Matubang, TS Palomares, JP Peralta, ET Quinitio, RJ Ragaza, JV Alejo, PB Regazpi, CE Romero, HA Montoya, JG Trinidad & KKA Roscom - 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 Bureau of Agriculture and Fisheries Standards (BAFS) of the Department of Agriculture (DA), in collaboration with the relevant government and research agencies, academe and industry organization, is currently developing the Philippine National Standard (PNS) for live mangrove crabs (also known as mud crabs). This PNS defines the food safety and quality requirements for live mangrove crabs in order to ensure consumers’ health and make the product globally competitive. The process in the development of standards include review of the existing requirements of local and foreign markets and internationally recognized standards, creation of the Technical Working Group, initial drafting of the PNS, conduct of public consultations in major production areas, finalization of the draft for the PNS, notification to the World Trade Organization and approval of the DA Secretary.

    The PNS for live mangrove crabs specifies the scope of the standard, product description, essential composition and quality factors, hygiene, handling, labeling requirements, methods of sampling, examination and analysis, definition of defectives, and the requirements for product lot acceptance.
  • Conference paper

    Updates on the larviculture of mud crab at SEAFDEC/AQD 

    ET Quinitio, JJDC Huervana, JC Virgula & FD Parado-Estepa - 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
    Although the mud crab (Scylla serrata) hatchery technology has been developed, issues such as high cost of production due to the need for additional facilities and labor for natural food culture, inconsistent survival rate at megalopa stage due to Molt Death Syndrome (MDS), and disease due to luminescent bacteria (Vibrio spp.), remain to be addressed. Refinements on the existing mud crab larviculture technology were done to address these problems.

    Poor nutrition, low water temperature and application of prophylaxis during the zoea l stage have been identified as possible causes of MDS. Six shrimp formulated diets (FD) were tested, and 3 of these proved to be suitable for mud crab larvicuture. Larval performance was compared using the 3 diets + natural food (NF, rotifers and Artemia) and NF alone as control. No significant difference was noted in the survival among the 4 treatments, although BP Nippai fed larvae had higher values. Lesser occurrence of MDS was observed in all the larvae fed FD+NF. Three mud crab larval diets with various attractants (squid, annelids, and squid + annelids) were also formulated and fed to the larvae. Results showed no significant difference among the 3 diets. The results of another experiment investigating the effects of the reduction of natural food showed that larvae fed 50% NF + 50% FD and 75%NF + 25% FD had higher survival compared to those fed 75% AD +25% NF and no NF at all. The results indicate that the larvae cannot survive with formulated diet alone. It has been observed that frequency of antibiotic application can be reduced to every 5 days if good quality mud crab larvae are used. Formalin stress test proved to be a reliable method to determine the quality of a batch of newly hatched zoeae. All prophylactic treatments are stopped when megalopae reach the benthic stage.

    To accelerate the dissemination of science-based mud crab hatchery technology to industry stakeholders, SEAFDEC/AQD entered into an agreement with private hatchery operators, State Universities and Colleges, and Local Government Units on giving assistance during initial hatchery operations. Technicians were given free training, followed by in-situ hatchery operations with assistance from SEAFDEC/AQD with the funding from PCAARRD-DOST. Crablets are now being produced by the collaborators. Increase in the production of hatchery-reared crablets will eventually reduce the dependence on wild-sourced mud crab seed stock for farming.

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