Growth and survival of hatchery-bred giant clams (Tridacna gigas) in an ocean nursery in Sagay Marine Reserve, Philippines
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Date
2010Author
Page views
7,610Subject
clam culture
growth rate
hatcheries
mariculture
marine parks
nursery grounds
Oceans
population density
reefs
restocking
shells
stocking (organisms)
survival
Hippopus hippopus
Tridacna crocea
Tridacna gigas
Tridacnidae
Philippines
Philippines, Negros I., Negros Occidental
assessment
Giant clam
Ocean nursery

growth rate

hatcheries

mariculture

marine parks

nursery grounds

Oceans

population density

reefs

restocking

shells

stocking (organisms)

survival

Hippopus hippopus

Tridacna crocea

Tridacna gigas

Tridacnidae

Philippines

Philippines, Negros I., Negros Occidental
assessment

Giant clam
Ocean nursery
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Abstract
To restore the diminishing population of the giant clam Tridacna gigas in Sagay Marine Reserve (SMR), Negros Occidental, central Philippines, two size classes [8- and 10-cm shell length (SL)] of hatchery-bred T. gigas were reared in an adjacent ocean nursery for restocking to Carbin Reef later upon reaching grow-out size of ≥20 cm SL. Growth rates did not significantly differ for both sizes and were on average 0.67 cm month−1. However, survival after 382 days of rearing T. gigas was significantly higher in the 10-cm SL clams than the 8-cm SL clams (96 and 83%, respectively). For future restocking projects, the use of 8-cm SL clams is recommended because the lower survival of this size class is compensated by its cheaper price. While rearing the clams to attain grow-out size, the population of wild clams (Family Tridacnidae) in Carbin Reef was assessed using ten 50 × 2-m belt transects. Four species of tridacnid clams have been recorded: Hippopus hippopus, Tridacna crocea, T. maxima>, and T. squamosa. T. crocea comprised 12.5–93.9% of all the clams observed in all ten transects. There was a significant difference in clam density between species (ANOVA, F = 6.94, P < 0.001), with T. crocea having the highest density. Living T. gigas were absent, but presence of dead shells was indicative of its presence in the reef in the past. It can be expected that the release of hatchery-bred T. gigas juveniles in Carbin Reef could provide future breeders that will repopulate this reef and the adjacent reef communities.
Suggested Citation
Lebata-Ramos, M. J. H. L., Okuzawa, K., Maliao, R. J., Abrogueña, J. B. R., Dimzon, M. D. N., Doyola-Solis, E. F. C., & Dacles, T. U. (2010). Growth and survival of hatchery-bred giant clams (Tridacna gigas) in an ocean nursery in Sagay Marine Reserve, Philippines. Aquaculture International , 18(1), 19-33. https://doi.org/10.1007/s10499-009-9272-4
Type
ArticleISSN
0967-6120; 1573-143XCollections
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