RECRUITMENT MECHANISM OF THE TROPICAL GLASS EELS GENUS ANGUILLA IN THE POSO ESTUARY, CENTRAL SULAWESI ISLAND, INDONESIA
Abstract: In order to
understand recruitment mechanism of the
tropical anguillid glass eels in the Poso Estuary, Central Sulawesi Island,
Indonesia, a year quantitative sampling fi eld was conducted from May 2008 to
April 2009. About 11181 specimens of glass eels were fi shed using line transects method of two triangular
scoop nets through 13 times of new moon and 1761 specimens were preserved for
examined in the laboratory. It was found that
recruitment of glass eels occurred almost throughout the year of investigation
and peak of recruitment occurred in
August. Anguilla celebesensis and Anguilla sp. nov 1 were recruited in dry
season, A. marmorata recruited in dry and rainy seasons, while A. interioris,
A. bicolor pacifi ca and Anguilla spp.
nov 2 recruited only in rainy season.
Anguilla celebesensis (69.17%) was the most dominant species recruited
in the estuary followed by A. marmorata (23.54%), Anguilla spp nov 1 (4.99%), Anguilla spp nov 2 (2.03%), A. interioris
(0.14%) and A. bicolor pacifi ca (0.04%). The onset of recruitment as well as fl uctuation of
abundance of the tropical anguillid glass eels into Poso estuary were strongly
associated with seasonal and circadian rhythmic as well as tidal and lunar
cycles that occurred in the central Indonesian regions.
Author: Hagi Y. Sugeha
Journal Code: jpperikanangg100005
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