Goby Lake (GLK) is one of the shallower meromictic marine lakes in Palau.
Only the northern basin (top right, in picture) is deep enough to shelter
anoxic bottom waters from tidal and wind-generated mixing and therefore
permit a dense population of purple-sulfur bacteria to grow at a chemocline
(see figure, below). The embayment to the south and the basin to the west
are oxygenated from the lake's surface to the flocculent sediments on
the bottom, at 4-5 m depth. Goby Lake, like Big Jellyfish Lake and Ongeim'l
Tketau, contains a population of golden jellyfish, Mastigias sp.,
with distinct behavioral, demographic, morphological, and physiological
characteristics. The lake gets its name, however, from the abundant small
fishes that inhabit the lake: the mangrove and puntang gobies (Acentrogobius
janthinopterus and Exyrias puntang, respectively), and the
goby-like eleotrid, Ophiocara porocephala.
Profiles show mean ± one standard error
(5 profiles, Oct. 1978 to Feb. 2001)
Arrow indicates Secchi disk depth
(mean ± one standard error)
Crustacea - Copepoda
Teleostei - Acentrogobius janthinopterus, Exyrias puntang,
Parioglossus sp., Ophiocara porocephala
Scyphozoa - Mastigias
Bivalvia - Brachidontes sp.
Sources: CRRF unpubl. data; Hamner & Hamner 1998