Southeast Asian Fisheries Development Center
Southeast Asian Fisheries Development Center, Aquaculture Department Institutional Repository (SEAFDEC/AQD Institutional Repository )Not a member yet
4215 research outputs found
Sort by
Aquaculture governance: Five engagement arenas for sustainability transformation
No full textSupplementary materialA greater focus on governance is needed to facilitate effective and substantive progress toward sustainability transformations in the aquaculture sector. Concerted governance efforts can help move the sector beyond fragmented technical questions associated with intensification and expansion, social and environmental impacts, and toward system-based approaches that address interconnected sustainability issues. Through a review and expert-elicitation process, we identify five engagement arenas to advance a governance agenda for aquaculture sustainability transformation: (1) setting sustainability transformation goals, (2) cross-sectoral linkages, (3) land–water–sea connectivity, (4) knowledge and innovation, and (5) value chains. We then outline the roles different actors and modes of governance can play in fostering sustainability transformations, and discuss action items for researchers, practitioners, and policymakers to operationalize activities within their engagement arenas
Production, feeding and storage of Tetraselmis tetrathele paste by electrolytic flocculation
No full textAn innovative microalgae harvesting technique using electroflocculation was carried out at different voltage treatments (4, 7, and 9 V) using a fabricated voltage regulator and compared with harvesting by electroflocculation at 12 V using a car battery to efficiently electroflocculate Tetraselmis tetrathele. This study was conducted to determine the ideal voltage settings that could improve the quality of harvested paste in terms of nutritional value and metal contamination for its later use in aquaculture. The use of 7 V achieved low Pb content producing the best harvest biomass (1.4 kg, 87 min) which is comparable to the harvest biomass (1.7 kg, 68 min) using a 12 V car battery. Storage of T. tetrathele paste is best done in a chiller (2 ± 1 °C) rather than a freezer (-20 ± -4 °C) for ease in reactivation and maintaining higher cell viability for later use as a starter in aquaculture. Storage in a chiller allows T. tetrathele paste to be resuspended after six months and used as a starter culture.This study was funded by the Aquaculture Department, Southeast Asian Fisheries Development Center (SEAFDEC/AQD) Study code: Nr-01-Y2018T
Inclusion of live mud polychaete (Marphysa iloiloensis) in the feeding regime improved the hatchery performance of domesticated Indian white shrimp (Penaeus indicus)
No full textA 60-day feeding trial was conducted to evaluate the effect of inclusion frequency of hatchery-bred mud polychaete, Marphysa iloiloensis, as part of a combination diet on the reproductive performance and larval quality of domesticated P. indicus. The two treatments were fed with a combination of formulated diet, mussel, squid, and mud polychaete with once (T1) and twice (T2) a week inclusion in the feeding regime. In contrast, the control group was fed only a diet combination of mussels, squid, and formulated diet. There was no significant difference in the mean survival of male and female broodstock in all treatments upon termination (. Shrimp in T1 and T2 performed significantly better than the control in terms of spawning frequency ( and fertilization rate (, while T1 had significantly high re-maturation (. The survival, spawning, hatching rate, egg, and nauplii production did not differ significantly among treatments (. Also, no difference in the gonado-somatic index (GSI), hepato-somatic index (HSI), spermatophore weight, and sperm count was found among diet treatments (. Post larvae from T1 and T2 performed significantly better than the control after 25 ( and 30 ( minutes of abrupt exposure to freshwater, respectively. Therefore, even once weekly, mud polychaete inclusion is sufficient to improve the reproductive performance of P. indicus broodstock and produce offspring with boosted resistance in the hatchery.This study was supported by SEAFDEC/AQD (Study Code: DP-02-C2017T)
Molluscan aquaculture in the Philippines: A review
No full textMolluscs are among the most valuable resources of the Philippines, an archipelagic country of 7,107 islands bounded by 36,000 km of coastline and 26.6 million ha of coastal waters. In 2020, production from mussels and oysters alone valued at PhP1.552 billion. As primary sources of food and livelihood for marginalized fisherfolk, they are considered important in food security, nutrition, and poverty alleviation. Nevertheless, for almost a century, mollusc culture remained small-scale, with most fish farmers investing in non-fed species, like mussels and oysters. Moreover, mollusc culture in the country is still dependent on wild sources of seed stocks, making production unsustainable and unreliable. This dependence on the wild seed stocks will continue until the issue of the lack of commercial-scale hatcheries or the limited capacity of existing hatcheries to produce seeds, both for top and emerging mollusc aquaculture species, is resolved. Although technologies from broodstock management to post-harvest are available in some species, the lack of capital and the limited government support limit these artisanal fishers from doing large commercial-scale culture. This paper summarizes what has been done and published on the leading mollusc species cultured in the Philippines. Future research activities may be designed based on the research gaps to refine available technologies and develop new ones to improve culture production. The lack of or limited relevant information on the viable economics of the different culture techniques at different culture phases, the limited availability of post-harvest technologies, and the sparse or lack of genetic information for these leading mollusc species are among the gaps that need to be addressed.Funds for these mollusc studies came from the Southeast Asian Fisheries Development Center Aquaculture Department (SEAFDEC/AQD); the Department of Science and Technology-Philippine Council for Agriculture, Aquatic and Natural Resources Research and Development (DOST-PCAARRD); the Government of Japan Trust Fund; the Japan International Research Center for Agricultural Sciences (JIRCAS); and the Ayala Corporation
Reproductive quality evaluation of male Indian white prawn Penaeus indicus broodstock-fed diets supplemented with polychaete extracts (Marphysa sp.)
No full textThe present study determined the effect of different polychaete extracts, namely, total soluble fraction (TSF), neutral lipid fraction (NLF) and polar lipid fraction (PLF), in the maturation and sperm quality of male Penaeus indicus. Three levels (0.25, 0.50 and 1.00%) of extracts were included using a 3 × 3 factorial design. Groups fed the basal diet (BD) and fresh-frozen diet served as controls. Extracts in varying doses and control groups did not have a significant effect on broodstock survival (67–87%; p = 0.960), maturation rate (42–68%; p = 0.615), inter-spermatophore period (8–10 days; p = 0.505) or sperm viability (97–100%; p = 0.819). However, sperm counts of broodstock fed BD (11.70 × 106 ±1.05 × 106 per spermatophore) and those fed diets supplemented with polychaete extracts were significantly higher compared to that fed with control fresh diet at 0.73 × 106± .09 × 106 (p = 0.001). Spermatophore crude lipid was highest in groups fed 0.25% TSF and 0.25% PLF of broodstock (p =1.0 x10−6 ). Inclusion of TSF (0.25–1.00%) significantly increased the spermatophore crude protein content of broodstock compared to those fed with other diets (p = 1.20 × 10−5). These results demonstrate that NLF and TSF extracts are bioactive components of polychaete which when fed to male P. indicus, can stimulate aspects of sperm production
Nursery and grow-out culture of snubnose pompano (Trachinotus blochii, Lacepede) in marine cages
No full textThis manual, titled “Nursery and Grow-out Culture of Snubnose Pompano (Trachinotus blochii, Lacepede) in Marine Cages,” includes culture methods and good practices that are the product of research done at the Aquaculture Department of the Southeast Asian Fisheries Development Center. The manual also tackles practical techniques useful to fish farmers interested in raising pompano in marine cages.This research is funded by SEAFDEC /AQD under the study code DP-03-F2021I
Black tiger shrimp revival program stepping up at AQD
No full textAs a highlight of its 50th anniversary, the SEAFDEC Aquaculture Department (AQD) inaugurated its new Black Tiger Shrimp Broodstock Facility in Tigbauan, Iloilo, Philippines on 3 July 2023. The biosecure facility was built to reduce reliance on wild shrimp spawners that often carry diseases which are then passed on to their eggs and larvae. Its four 120-ton broodstock tanks, with a combined holding facility of 1,440 fully-grown breeders, are projected to produce 80 million postlarvae annually. More importantly, it is hoped to be a source of disease-free captive broodstock which is critical to achieving high survival rates and the production of high-quality postlarvae in the hatchery
AQD Matters 2022 November - December
No full textIn this issue: 1) SEAFDEC/AQD hosts 45th PCM; 2) AQD's research paper conferred with Dr. Elvira Q. Tan award; 3) Scientist emerita elected TWAS Fellow; 4) Malaysian university eyes collab with AQD; 5) Japanese professor keen on seaweed research; wants collab; 6) SEAFDEC/AQD scientist embarks on a research trip to Japan; 7) Meeting held to review SEAFDEC/AQD's accomplishments, discuss plans for 2023; 8) International training on community-based freshwater aquaculture held at Rizal; 8) GOJ sends AQD researcher to Japan for specialized training in seaweed; 9) Free books on aquaculture announced by AQD; 10) International online training for crab production; 11) Session 3 of AQD's intensive aquaculture training kicks off; 12) Christmas season at SEAFDEC/AQ
AQD Matters 2023 May - June
No full textIn this issue: 1) Training empowers fisherfolks to boost abalone production; 2) Chief Baliao's opinion sought on proposed gov't hatcheries; 3) Backyard fish farmers upgrade skills through training on freshwater aquaculture; 4) SEAFDEC/AQD intensifies round scad research; stocks up on more breeders; 5) SEAFDEC/AQD strengthens teamwork and camaraderie through sports; 6) Coastal cleanup comes to Tigbauan's 2 barangays; 7) Sandfish culture training for the Pacific Communit
Behavior changes and LC50 of dried garlic (Allium sativum) acute toxicity in Nile tilapia (Oreochromis niloticus) juvenile
No full textPlant-based compounds are emerging substitutes for chemical treatments in aquaculture since they are known to cause less harm to both the environment and its organisms. Garlic (Allium sativum) is a popular herb that has a broad range of uses, especially in the control and treatment of bacterial and parasitic diseases. However, its toxicity to tilapia is not well-studied. Hence, this study was conducted to test the toxicity levels of garlic powder in juvenile Nile tilapia (Oreochromis niloticus) by determining the cumulative mortality and median lethal concentration (LC50). Test fish were exposed through immersion in 6 concentrations (150, 200, 250, 300, 350, and 400 mg L-1) of garlic powder with 25% allicin and a control in 96 h static bioassay. Within 24 h, test fish exposed to 250 mg L-1 garlic and above, exhibited abnormal behaviors such as lethargy, gasping for air, and weak responses to environmental stimuli. Cumulative mortality was highest at 100% in 400 mg L-1 garlic at 48 h. Mortalities were dependent on the concentration and duration of exposure. The 96 h LC50 of garlic powder to O. niloticus is 225.86 mg L-1 with lower and upper confidence limits of 210.37 and 242.50 mg L-1, respectively at 27°C.The authors thank the Government of Japan Trust Fund (Study Code: 8400-T-RD-FH0215) for funding this study. We are grateful to Dr. Evelyn Grace Ayson and Mr. Peter Palma for their valuable comments on the manuscript and technical assistance of Mr. Elvis Biñas