Marine biodiversity at the SEAFDEC/AQD research stations in Iloilo and Guimaras, Philippines
MetadataShow full item record
Species inventories were recently made in and around the research stations of the SEAFDEC Aquaculture Department to facilitate subsequent monitoring. AQD s Tigbauan Main Station (TMS, since 1973) faces the deep open waters of the Panay Gulf and Sulu Sea and is flanked by densely populated fishing villages operating nearshore fish corrals, gillnets, longlines, and beach seines. In 2013 2014, sampling at the sand-gravel intertidal and monitoring of the catch of the various gears showed at least 579 species from 213 families, including 252 species of fishes, 228 mollusks, 48 crustaceans, 12 cnidarians, 9 echinoderms, 16 seaweeds, sea turtles, and sea snakes inhabiting the nearshore areas off TMS. Any adverse effect of the TMS hatcheries and laboratories is difficult to discern on top of the continuous intense fishing and habitat disturbance. AQD s Igang Marine Station (IMS, since 1980) is in a cove under the rocky cliffs of southern Guimaras, behind several islands facing the Panay Gulf and Sulu Sea. IMS includes 40 ha of seagrass beds and sandflats around five rocky islets and two 6 12 m deep basins where broodstock and growout cages are moored. IMS is flanked by many fish corrals operated by fishers who live in villages in nearby coves. Fishers on outrigger boats also use gillnets and spears, and others glean for mollusks and echinoderms inside IMS. In 2011 2012, some 786 species in 261 families were collected or photographed at IMS, including 74 species of fishes, 40 crustaceans, 391 mollusks, 44 echinoderms, 87 cnidarians, 47 poriferans, 24 ascidians, and 12 bryozoans, and sea snakes living among 48 seaweeds and 4 seagrasses. Biodiversity at IMS seems high despite 35 years of operation of the fish cages and the continuous fishing, gleaning, and boating by the locals. Several species of filter-feeding invertebrates grew on the cage nets and platforms but were not found in the natural habitats. The cages provide additional attachment surfaces for many species; these biofoulants presumably reduce water flow into the cages but they also remove nutrients and particulate wastes and help maintain good water quality. Nevertheless, siltation is evident under the cliffs inside the cove, and the sandflats may be expanding over the seagrass beds. AQD s 16ha Dumangas Brackishwater Station (DBS, since 1998) is flanked by freshwater Talaugis River, by hundreds of hectares of mangrove-derived fish ponds, and by Pulao Creek and an extensive mudflat with fringing mangroves at the northeastern end of Iloilo Strait. In 2009 2010, 16 ponds with water areas from 0.5 to 0.9 ha were sampled during harvest of the experimental crops. At least 90 species of non-crop fishes lived in the DBS ponds, along with 35 crustaceans, 60 mollusks, three echinoderms, two cnidarians, and a water snake. The snails Cerithideopsilla spp., Cerithium coralium, and Batillaria spp. were very abundant in the ponds. Almost all the same species in the ponds, plus many others, were found in the adjoining fringing mangroves with ~10 species of trees. The ponds serve as proxy for mangrove lagoons that harbor the young of migratory fishes as well as all life stages of resident species. Several non-crop species inside the IMS cages and the DBS ponds are harvested by the pond workers and contribute to nutrition and income. Aquaculture farms should be managed for high biodiversity to ensure sustainability. Ways are suggested for SEAFDEC/AQD to do so at its aquaculture research stations.
Bagarinao, T. U. (2015). Marine biodiversity at the SEAFDEC/AQD research stations in Iloilo and Guimaras, Philippines. In M. R. R. Romana-Eguia, F. D. Parado-Estepa, N. D. Salayo, &M. J. H. Lebata-Ramos (Eds.), Resource Enhancement and Sustainable Aquaculture Practices in Southeast Asia: Challenges in Responsible Production of Aquatic Species: Proceedings of the International Workshop on Resource Enhancement and Sustainable Aquaculture Practices in Southeast Asia 2014 (RESA) (pp. 261-281). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center.
PublisherAquaculture Department, Southeast Asian Fisheries Development Center
Biological surveys; Fishery institutions; Environmental impact; Biodiversity; Check lists; Aquaculture; Sustainability; Brackishwater aquaculture; Community composition; Species diversity; Cage culture; Culture effects; Marine organisms; Marine aquaculture; Species inventories; Biodiversity; Sustainability; Philippines
Showing items related by title, author, creator and subject.
Conference paperJH Primavera - In Proceedings of the Joint Regional Seminar of the Ecotone-SeaBRnet 2007 and the 9th Conference of the China Biosphere … Sustainable Development, Maolan Biosphere Reserve, Libo County, Guizhou Province, P. R. China, 7-12 November 2007, 2008 - UNESCO Office
ArticleMLA Cuvin-Aralar -
Lakes and Reservoirs: Research & Management, 2016 - WileyLaguna de Bay is the largest inland water body in the Philippines, being used predominantly for aquaculture and open water fisheries. Aquaculture in the lake began decades ago, with many changes in the lake ecosystem having occurred since that time. Most dominant species for fish culture are introduced species. Other invasive species were also introduced to the lake as escapees from land-based aquaculture facilities. This study was conducted to monitor fish diversity in two adjacent, but distinctly different, sites in the lake, namely an open fishery area (OFS), with no adjacent aquaculture structures, and an aquaculture site (AQS), with cages for the culture of various commodities. Fish traps were installed at both sites, with the traps being sampled at least every 2 weeks from April 2013 to February 2015. The results of pairwise t-tests indicated significantly higher Shannon–Wiener diversity index (H′), evenness (J′), Simpson's similarity index (D) and species richness (s) in OFS than in AQS. In terms of total catch per day, significantly greater fish biomass were obtained from AQS than from OFS. Introduced aquaculture species had a mean dominance of 83% and 47% in AQS and OFS, respectively. However, invasive species introduced from the ornamental fish trade exhibited a mean relative dominance of 10.3% in AQS and 13.5% in OFS. The relative dominance of native species was also significantly higher in OFS (41%) than in AQS (6.5%). The results of this study demonstrated the adverse impacts of aquaculture in regard to the species diversity of fish in localized areas in Laguna de Bay. The dependency of aquaculture on introduced fish species adversely impacted the natural fish population in the lake. Focusing on the culture of commercially important local species for aquaculture, rather than introduced species, will improve fish production of inland waters without accompanying adverse impacts on biodiversity.
Conference paperJH Primavera - In M Troell, T Hecht, M Beveridge, S Stead, I Bryceson, N Kautsky, A Mmochi & F Ollevier (Eds.), Mariculture in the WIO region - Challenges and Prospects. Proceedings from Workshop on Mariculture, December 2009, Zanzibar, 2011 - Western Indian Ocean Marine Science Association (WIOMSA)Although brackishwater ponds have been a major factor in mangrove loss in Southeast Asia where aquaculture is centuries-old, the “No Touch option” for mangroves is a luxury that most countries in the region cannot afford. So the question is not whether mangroves and aquaculture are compatible, but how best to integrate them so that mangrove services are maximized while some benefits from aquaculture remain? A review of “mangrove-friendly aquaculture” or MFA in Southeast Asia shows that while some technologies are traditional, others are government-driven (rather than research-based, to mitigate social conflict). MFA may be sited in subtidal waterways (e.g., seaweeds, bivalves) or the intertidal forest -- Hong Kong gei wai, Indonesian tambak tumpang sari, Vietnam mixed mangrove-shrimp farm systems and mangrove pens for mudcrab in Malaysia.