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Preliminary survey of pests and diseases of eucheumatoid seaweed farms in the Philippines

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Abstract

Farmed eucheumatoids are the top aquaculture commodity in the Philippines, contributing more than 60% of total national aquaculture production by volume. Despite significant production losses observed in recent years due to pests and diseases, data relating to the temporal and spatial geographic distribution, seasonality, prevalence, and etiology of these critical problems at the farm level are lacking. Here, we assessed the prevalence of pests and diseases at 16 farm sites within several major seaweed growing areas, including Luzon (Palawan), Visayas (Bohol), and Mindanao (Zamboanga City, Davao del Norte, and Tawi-Tawi). Prevalence of pests and diseases were recorded by assessment of individual seaweed plants in situ, comprising ≥5% of the total number of seaweed plants on each farm. Results from this survey revealed “ice-ice” disease (IID) at all sites, albeit at low prevalence rates of below 25%, the exception being one site where prevalence was 100%. No significant difference in the prevalence of IID was found between farms in shallow (≈0.5 m during low tide) and deep water sites (depths exceeding 4 m during the lowest tide) (p>0.05). Moderate prevalence (26–50%) of the macro-epiphyte pests Sargassum and Ulva was reported in Luzon. Further, epiphytic filamentous algae (EFA), black spots, and evidence of grazing were recorded in several farms with low prevalence (0.2–11.2%). The three farms with the highest prevalence of IID and EFA were evaluated to determine the severity of cover on the thallus of infected plants. A very high severity of IID (76–100% coverage) was observed on the secondary and primary branches, while for EFA, low severity (≤25%) was found in all regions of the thallus. Our results suggest the widespread occurrence of yield-limiting diseases and pests affecting eucheumatoid farms in the Philippines. Strategies for the diagnosis, surveillance, and management of yield-limiting pests and diseases are needed to ensure maintenance and sustainable expansion of this important aquaculture sector in the Philippines.

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Acknowledgements

The authors are grateful to the seaweed farmers and operators, Local Government Unit (LGU) staff, and the Bureau of Fisheries and Aquatic Resources (BFAR) Regional Offices where sampling sites were done for extending their help in the successful conduct of this study.

Funding

This study was mainly supported by the United Kingdom Research and Innovation–Global Challenges Research Fund (UKRI-GCRF) “GlobalSeaweedSTAR” Programme (Grant No. BB/P027806/1) and implemented in part at SEAFDEC/ AQD with a Study Code: FH-01-S2017T.

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Authors and Affiliations

  1. Aquaculture Department, Southeast Asian Fisheries Development Center, 5021, Tigbauan, Iloilo, Philippines

    Joseph P. Faisan Jr

  2. Institute of Aquaculture, College of Fisheries and Ocean Sciences, University of the Philippines Visayas, 5023, Miagao, Iloilo, Philippines

    Joseph P. Faisan Jr, Ma. Rovilla J. Luhan, Rema C. Sibonga, Jonalyn P. Mateo, Victor Marco Emmanuel N. Ferriols & Anicia Q. Hurtado

  3. Institute of Marine Fisheries and Oceanology, College of Fisheries and Ocean Sciences, University of the Philippines Visayas, Miagao, 5023, Iloilo, Philippines

    Jonalyn P. Mateo

  4. Scottish Association for Marine Science, Scottish Marine Institute, Dunbeg, Oban, Argyll, PA37, UK

    Janina Brakel

  5. Department of Life Sciences, Natural History Museum, London, SW7 5BD, UK

    Georgia M. Ward, David Bass & Juliet Brodie

  6. Centre for Environment, Fisheries and Aquaculture Science (Cefas), Weymouth Laboratory, Weymouth, Dorset, DT4 8UB, UK

    Georgia M. Ward, Stuart Ross, David Bass & Grant D. Stentiford

  7. Centre for Sustainable Aquaculture Futures, University of Exeter, Stocker Road, Exeter, EX4 4QY, UK

    David Bass & Grant D. Stentiford

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  1. Joseph P. Faisan Jr
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  2. Ma. Rovilla J. Luhan
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  9. David Bass
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  10. Grant D. Stentiford
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  11. Juliet Brodie
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  12. Anicia Q. Hurtado
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Correspondence to Joseph P. Faisan Jr or Anicia Q. Hurtado.

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Faisan, J.P., Luhan, M.R.J., Sibonga, R.C. et al. Preliminary survey of pests and diseases of eucheumatoid seaweed farms in the Philippines. J Appl Phycol 33, 2391–2405 (2021). https://doi.org/10.1007/s10811-021-02481-5

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