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    • Book chapter

      Co-culture trials of sandfish Holothuria scabra and black tiger shrimp Penaeus monodon in mangroves 

      MJH Lebata-Ramos, EFD Solis, RC Sibonga & S Watanabe - In K Tanaka, S Morioka & S Watanabe (Eds.), Sustainable stock management and development of aquaculture technology suitable for Southeast Asia, 2012 - Japan International Research Center for Agricultural Sciences
      Series: JIRCAS Working Report; No. 75
      To address its mandate to develop environment-friendly culture techniques, the Southeast Asian Fisheries Development Center, Aquaculture Department (SEAFDEC/AQD) is trying to establish a culture system in mangroves for commercially important aquaculture species. Recently, SEAFDEC/AQD has successfully produced sandfish, Holothuria scabra, in the hatchery. Using hatchery-bred juveniles, monoculture and co-culture trials are being conducted in ponds, pens and cages. This study investigated the feasibility of the co-culture of black tiger shrimp, Penaeus monodon, and H. scabra in the mangroves by comparing growth and survival in monoculture and co-culture conditions. Water and sediment quality were compared between treatments. Results showed that growth and survival of P. monodon (P. monodon only = 48.8±4.9%; P. monodon + H. scabra = 46.1±7.4%) and H. scabra (H. scabra only = 13.1±6.1%; P. monodon + H. scabra = 12.3±6.2%) grown together or separately did not significantly differ. P. monodon survivial was positively correlated while growth negatiely correlated with temperature. Feed input significantly increased sulfide levels in both treatments (P. monodon; P. monodon + H. scabra) and sulfide significantly differed between treatments with the highest concentration in P. monodon only, then P. monodon + H. scabra and H. scabra only. Ammonia concentrations followed the same trend as sulfide but did not significantly differ among treatments. P. monodon cultured in mangroves were not affected by the white spot syndrome virus which affected neighboring culture ponds. Results of these initial trials may not be conclusive yet but show a promising culture system for P. monodon that may be integrated with the mangroves.
    • Article

      Evaluation of post-release behavior, recapture, and growth rates of hatchery-reared abalone Haliotis asinina released in Sagay Marine Reserve, Philippines 

      MJH Lebata-Ramos, EFC Doyola-Solis, JBR Abrogueña, H Ogata, JG Sumbing & RC Sibonga - Reviews in Fisheries Science, 2013 - Taylor & Francis
      The lucrative returns brought by abalone fisheries have caused overexploitation and decline of the wild population. In the Philippines, the Aquaculture Department of the Southeast Asian Fisheries Development Center has successfully produced Haliotis asinina seeds in the hatchery. Aside from utilizing these seeds in aquaculture, they are also being considered for future stock enhancement endeavors of the department. This study aimed to evaluate post release behavior, recapture and growth rates of hatchery-reared abalone juveniles released in the Sagay Marine Reserve. From the two release trials conducted, results showed that abalone of shell length >3.0 cm had lower mortality during onsite acclimation and utilized transport modules as temporary shelter for a shorter period after release. Both wild and hatchery-reared abalone preferred dead branching corals with encrusting algae as their habitat. Recapture rates were comparable between the wild (7.97%) and hatchery-reared (HR2) abalone (6.47%). Monthly growth rates were almost the same between wild (0.25 cm, 4.0 g), hatchery-reared (HR1: 0.27 cm, 4.6 g; HR2: 0.35 cm, 3.8 g) abalone. Moreover, hatchery-reared abalone were recaptured up to 513 days post-release, indicating viability of released stocks in the wild. Results of releases revealed that hatchery-reared abalone can grow and survive with their wild conspecifics.