Southeast Asian Fisheries Development Center
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SEAFDEC/AQD highlights 2024
No full textSEAFDEC/AQD highlights 2024 is SEAFDEC/AQD's annual report updating on its accomplishments and progress for the year 2024
Where sea turtles meet people and fisheries: Citizen research for conservation
No full textSince 2000, SEAFDEC FishWorld has served as a focal point for community engagement in marine biodiversity conservation, with a particular emphasis on sea turtle protection in the waters surrounding Panay and Guimaras Islands. This book presents the outcomes of a long-term initiative involving the documentation, tagging, release, and care of sea turtles incidentally captured in local fisheries. It provides a permanent record of 335 sea turtles, including documentary photographs of 214 individuals, and offers extensive data and new insights into the status and ecology of these endangered species in Philippine waters. The volume details the interactions between sea turtles, fishing gear, and coastal communities, highlighting collaborative efforts among FishWorld, fishers, and government agencies to promote conservation and reduce turtle capture. Written for fishers, conservation practitioners, government officers, educators, and the general public, the book combines scientific information with accessible, pictorial presentation. It contributes significantly to national efforts to raise awareness, foster community participation, and strengthen the protection of sea turtles and the marine ecosystems that sustain them.Forest Foundation Philippines funded the printing of Where Sea Turtles Meet People and Fisheries under GA 2025-18 of its National – Research/Publications/Campaigns Program, in light of the importance of mangrove and beach forests for species conservation
The reestablishment of mangrove crabs (Scylla spp.) in an abandoned pond following natural mangrove recolonization
No full textScylla spp. are among the most economically important fisheries resources derived from the mangroves. However, the widespread mangrove destruction resulted in the loss of habitat, thus the dwindling capture production of many mangrove-associated faunas. Although studies have shown that Scylla populations have reestablished in mangrove-reforested areas, this study was the first in a mangrove-recolonized abandoned pond in the Philippines. Six fishers conducted standardized fishing every spring tide of the month using cylindrical bamboo traps. All crabs caught from July 2010 to December 2011 were recorded for species, sex, sexual maturation of females, carapace width (CW), and body weight (BW). Total landings comprised 14,262 crabs weighing 1,743 kg; 79.67% Scylla olivacea, 20.18% S. tranquebarica, and 0.15% S. serrata. CW ranged 3.1–17.1 cm and BW 10–1,250 g, with the male crabs comprising 39.23–64.65% of the monthly landings and the females distributed as 19.88–45.01% immature, 0.50–16.57% mature, 0.45–16.02% gravid, and less than 0.10% spent crabs. Monthly landings ranged 254–1,231 pcs of crabs or 32.38–160.59 kg. The monthly mean catch per unit effort (CPUE), in terms of number, was 0.101 ± 0.01–0.456 ± 0.02 crab gear−1 day−1 (max = 1.13), while in terms of biomass, 12.86 ± 0.84–54.36 ± 3.16 g gear−1 day−1 (max = 112.50). Length–weight relationships of S. olivacea and S. tranquebarica are expressed as W = 0.224967L2.9864 (r2 = 94.08%, p < 0.001; n = 11,363) and W = 0.173409L3.1074 (r2 = 92.71%, p < 0.001; n = 2,878), respectively. This study revealed that Scylla spp. could reestablish in mangrove-recolonized abandoned ponds.The Project Team greatly appreciates the Government of Japan Trust Fund (GOJ-TF) and the Aquaculture Department of the Southeast Asian Fisheries Development Center (SEAFDEC/AQD) for jointly funding the project (Study Code FS-03-C2010T
Establishment of a responsible shrimp farming system using an ecosystem approach
No full textGreen algae (Caulerpa), red algae (Gracilaria), and sandfish were nominated as purifying organisms suitable for shrimp farms in this study. Circulating microcosm experiments were conducted to examine the effects of those purifying organism candidates on rearing water quality and disease-causative bacteria and their impact on shrimp production. However, the three nominated purifying organisms could not enhance shrimp survival. Due to mass weight reduction during the experimental period, these purifying organisms were unlikely to be used as aquaculture by-products. On the other hand, the experiment showed that Caulerpa, Gracilaria, and sandfish, while not having the potential to reduce or remove disease-causing bacteria, can still effectively remove NH₄ and total assimilated nutrients (TAN). The removal level did not differ among the three septic organisms, indicating that they can improve water quality equally. The septic organisms are expected to contribute in maintaining a healthy aquaculture environment by mitigating harmful substances for shrimp, such as NH₄ and TAN, in aquaculture effluents. It is essential to note that if these purifying organisms are utilized in an aquaculture system, proper adjustments to their culture environment, such as salinity, should be made to ensure higher rates of survival and efficiency. This valuable information may help small-scale shrimp farmers establish aquaculture management plans to improve productivity through the proper maintenance of the aquaculture environment by using septic organisms
Development of aquaculture techniques on new aquatic species to create and promote a local aquaculture industry in Southeast Asia
No full textAquaculture achieved a significant milestone in 2022, surpassing capture fisheries production as the leading aquatic producer. Its global production reached 130.9 million t, with 94.4 million t comprising aquatic animals, marking a 4.4 % surge from 2020 (FAO, 2024). This milestone, coupled with the decline of capture fishery production due to overexploitation and overfishing, underscores the need to explore and develop aquaculture techniques for new aquatic species. Once established, these techniques will be promoted and hopefully create a new local aquaculture industry in Southeast Asia.
Recognizing the unparalleled success and expertise of the Aquaculture Department of the Southeast Asian Fisheries Development Center (SEAFDEC/AQD) in the development of aquaculture technologies, especially in the broodstock management, spawning, larval rearing, nursery and grow-out culture, fish nutrition, and fish health management, this study, with funding support from the Japanese Trust Fund (JTF), aims to develop aquaculture techniques for new aquatic species, namely: slipper lobster (Thenus orientalis), kawakawa (Euthynnus affinis), and shortfin scad (Decapterus macrosoma). Furthermore, this study was conducted to generate basic information on reproductive biology, breeding, farming techniques, feeding habits, fish health, and other relevant data for developing aquaculture techniques of the three species through the collection from identified sites, transport, stocking, and management of broodstock, larval rearing, feeding, and health management experiments
AQD Matters 2023 November - December
No full textIn this issue: 1) Aquaculture commodities featured in national science exhibition; 2) SEAFDEC/IFRDMD explores collaborative anguillid eel study with SEAFDEC/AQD; 3) Construction underway for aquaculture feed mill facility; 4) SEAFDEC/AQD's Deputy Chief offers solutions at international symposium; 5) SEAFDEC convenes 46PCM back-to-back with 26FCG/ASSP; 6) LGU-General Luna officials visit SEAFDEC/AQD headquarters; 7) FishWorld Aqua Week; 8) Prized crabs find new home in abandoned ponds; 9) Scientists refine method to trace the complicated diets of Japanese scallops; 10) SEAFDEC/AQD discusses accomplishments, plans with host government; 11) SEAFDEC/AQD, BFAR-6 collaborate for hatcheries, outreach stations; 12) Tourism Secretary Christina Frasco visits heritage destinations in southern Iloil
Complex patterns of genetic structure in the sea cucumber Holothuria (Metriatyla) scabra from the Philippines: implications for aquaculture and fishery management
Full text linkThe Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fmars.2024.1396016/full#supplementary-materialThe sandfish Holothuria (Metriatyla) scabra, is a high-value tropical sea cucumber harvested from wild stocks for over four centuries in multi-species fisheries across its Indo-Pacific distribution, for the global bêche-de-mer (BDM) trade. Within Southeast Asia, the Philippines is an important centre of the BDM trade, however overharvesting and largely open fishery management have resulted in declining catch volumes. Sandfish mariculture has been developed to supplement BDM supply and assist restocking efforts; however, it is heavily reliant on wild populations for broodstock supply. Consequently, to inform fishery, mariculture, germplasm and translocation management policies for both wild and captive resources, a high-resolution genomic audit of 16 wild sandfish populations was conducted, employing a proven genotyping-by-sequencing approach for this species (DArTseq). Genomic data (8,266 selectively-neutral and 117 putatively-adaptive SNPs) were used to assess fine-scale genetic structure, diversity, relatedness, population connectivity and local adaptation at both broad (biogeographic region) and local (within-biogeographic region) scales. An independent hydrodynamic particle dispersal model was also used to assess population connectivity. The overall pattern of population differentiation at the country level for H. scabra in the Philippines is complex, with nine genetic stocks and respective management units delineated across 5 biogeographic regions: (1) Celebes Sea, (2) North and (3) South Philippine Seas, (4) South China and Internal Seas and (5) Sulu Sea. Genetic connectivity is highest within proximate marine biogeographic regions (mean Fst=0.016), with greater separation evident between geographically distant sites (Fst range=0.041–0.045). Signatures of local adaptation were detected among six biogeographic regions, with genetic bottlenecks at 5 sites, particularly within historically heavily-exploited locations in the western and central Philippines. Genetic structure is influenced by geographic distance, larval dispersal capacity, species-specific larval development and settlement attributes, variable ocean current-mediated gene flow, source and sink location geography and habitat heterogeneity across the archipelago. Data reported here will inform accurate and sustainable fishery regulation, conservation of genetic diversity, direct broodstock sourcing for mariculture and guide restocking interventions across the Philippines.The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Australian Centre for International Agriculture Research (ACIAR) project FIS/2016/122: “Increasing technical skills supporting community-based sea cucumber production in Vietnam and the Philippines”. Philippine Council for Agriculture, Aquatic and Natural Resources Research and Development of the Department of Science and Technology (DOST-PCAARRD: Project Numbers QSR-MR-CUC.02.01 and QSR-MR-CUC.02.02)
SEAFDEC/AQD highlights 2023
Full text linkSEAFDEC/AQD highlights 2023 is SEAFDEC/AQD's annual report updating on its accomplishments and progress for the year 2023
Effect of malachite green on post-exposure filtration rate of blood clam Barbartia virescens (Reeve 1844)
No full textThe aim of this study was to investigate the effect of malachite green on the post-exposure filtration rate of Blood Clam, Barbatia virescens. Blood Clams were collected from the rocky coast and acclimated to laboratory conditions for 18 days. Bioassays were conducted wherein Blood Clams were exposed for 24 h to a clean medium (no malachite green), 0.06 mg l-1 malachite green, 0.32 mg l-1 malachite green, 5.06 mg l-1 malachite green, and then to the same concentrations for 48 h. Filtration rate in all concentrations and malachite green-exposure durations were determined at 0.5, 1, 2, 3, 4, and 6 h. Blood Clams exposed for 24 h and 48 h to 0.32 and 5.06 mg l-1 had significantly lower filtration rates than the control (p <0.05). Similarly, those exposed to 0.06 mg l-1 for 48 h showed significant reduction in their filtration rates. The lower rate was associated with longer exposure to malachite green. In addition, Blood Clams exposed for 48 h were not able to improve their filtration rate, although they were transferred to a clean medium for 6 h. The green colouration on Blood Clams’ muscles was also not eliminated. These findings suggest the ecological risk of malachite green to bivalves and its implications to the health of sessile coastal organisms.This study was an output of a travel grant of Ms. Mandario (first author) to participate as an exchange student to Kagoshima University Faculty of Fisheries (KUFF)