First-phase juvenile rearing of the sea cucumber Holothuria Scabra in Eastern Samar, Philippines / Nonita Cabacaba and Cristan Joy M. Campo

By:

Cabacaba, Nonita

Contributor(s):

Campo, Cristan Joy M [author]

Material type: Article

ArticlePublisher: Quezon City, Philippines : Bureau of Fisheries and Aquatic Resources , 2019Content type:

text

Media type:

computer

Carrier type:

online resource

ISSN:

2672-2836 (Online)

Subject(s):

In: Philippines. The Philippine Journal of Fisheries Volume 26, Issue no. 2 (July - December 2019), page 72 - 81Abstract: Experiments were conducted to optimize the nursery rearing methods for the sea cucumber Holothuria scabra at the BFAR-GMFDC, Eastern Samar. The growth performance and survivorship of juveniles were compared in different locations, seasonality, stocking densities, and rearing media. For the experiments on location and seasonality, nursery rearing was conducted in Guiuan and in Salcedo, Eastern Samar during April-May, July-August, and September-October 2018. The mean total weight gain (TWG) and specific growth rate (SGR) of juveniles were significantly better in Guiuan (3.78 g and 13.09%.d-1, respectively) compared to Salcedo (1.997 g and 11.70%.d-1, respectively) (p < 0.05). However, survival rates were significantly higher in Salcedo (75.67%) compared to that of Guiuan (66.89%) (t=-1.732, p>0.05). Predatory crabs and parasitic isopods (Cymodoce sp.) infiltrated the net cages in Guiuan, which increased the mortality of juveniles. Highest growth and survivorship were observed during dry months in April-May 2018 (TWG of 3.71 g, survival of 71.39%) but were lowest during the wet season in September-October 2018 (TWG of 2.26 g, survival of 70.89%). However, the growth and survival results did not significantly differ among different months (p>0.05). For the experiment on stocking density, juveniles stocked at 300 ind./cage had the highest growth (TWG of 5.19 g, SGR of 13.86%.d-1) while juveniles at 1000 ind./cage had the lowest growth (TWG of 1.28 g, SGR of 10.70%.d-1) (p < 0.05). Survival rates of the juveniles in 300 ind./cage were also highest (80.30%). This study recommends stocking juveniles at 500 ind./cage since survival at this density did not significantly differ with that of 300 ind./cage (p>0.05). In terms of rearing medium, growth was better in floating net cages (TWG of 2.60 g, SGR of 11.67%.d-1) compared to indoor tanks (TWG of 0.18 g, SGR of 6.38%.d-1). However, indoor tanks yielded higher survival rate (67.83%) than floating net cages (56.11%) (p>0.05). Higher mortality in net cages was caused by intruding predators and fluctuations in water quality.

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Holdings
Item type	Current library	Collection	Call number	Vol info	Status	Date due	Barcode
Journal Article	NFRDI Central Office NFRDI KMRC Indexed Materials Collection	Electronic		Volume 26, Issue no. 2 (July - December 2019), page 72 - 81	Available		IMC000213
Journal	NFRDI Central Office NFRDI KMRC Institutional Repository Collection	Electronic	SH 1 .B9524 2019 vol. 26 no. 2 (Browse shelf(Opens below))	Volume 26, No. 2 (July - December 2019)	Available		IRC00036

Includes bibliographical references

Experiments were conducted to optimize the nursery rearing methods for the sea cucumber Holothuria scabra at the BFAR-GMFDC, Eastern Samar. The growth performance and survivorship of juveniles were compared in different locations, seasonality, stocking densities, and rearing media. For the experiments on location and seasonality, nursery rearing was conducted in Guiuan and in Salcedo, Eastern Samar during April-May, July-August, and September-October 2018. The mean total weight gain (TWG) and specific growth rate (SGR) of juveniles were significantly better in Guiuan (3.78 g and 13.09%.d-1, respectively) compared to Salcedo (1.997 g and 11.70%.d-1, respectively) (p < 0.05). However, survival rates were significantly higher in Salcedo (75.67%) compared to that of Guiuan (66.89%) (t=-1.732, p>0.05). Predatory crabs and parasitic isopods (Cymodoce sp.) infiltrated the net cages in Guiuan, which increased the mortality of juveniles. Highest growth and survivorship were observed during dry months in April-May 2018 (TWG of 3.71 g, survival of 71.39%) but were lowest during the wet season in September-October 2018 (TWG of 2.26 g, survival of 70.89%). However, the growth and survival results did not significantly differ among different months (p>0.05). For the experiment on stocking density, juveniles stocked at 300 ind./cage had the highest growth (TWG of 5.19 g, SGR of 13.86%.d-1) while juveniles at 1000 ind./cage had the lowest growth (TWG of 1.28 g, SGR of 10.70%.d-1) (p < 0.05). Survival rates of the juveniles in 300 ind./cage were also highest (80.30%). This study recommends stocking juveniles at 500 ind./cage since survival at this density did not significantly differ with that of 300 ind./cage (p>0.05). In terms of rearing medium, growth was better in floating net cages (TWG of 2.60 g, SGR of 11.67%.d-1) compared to indoor tanks (TWG of 0.18 g, SGR of 6.38%.d-1). However, indoor tanks yielded higher survival rate (67.83%) than floating net cages (56.11%) (p>0.05). Higher mortality in net cages was caused by intruding predators and fluctuations in water quality.

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