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Ancistrus cf. temminckii was first found on O`ahu in 1985.
Species in the genus Ancistrus are distinctive because of their
prominent snout tentacles occurring in both sexes, with the tentacles
having the greatest development in breeding males. The largest Ancistrus
cf. temminckii specimen collected in Manoa Stream was 78 mm.
This species appears to preferentially select high velocity riffle and
run habitats, and is less common in pool habitats. In Manoa Stream, bristle-nosed
catfish densities are high and may also be in part contributing to the
near absence of the native goby Awaous guamensis.
Native stream gobies are undoubtedly adversely affected by loricariid
catfish through competition for food and space, and introduced parasites.
Loricariid catfish found in O`ahu streams feed primarily on algae but
will also readily consume fish eggs. Although habitat disturbance and
other introduced fish are factors, native gobies such as Awaous guamensis
are rare in the lowest sections of south shore O`ahu streams containing
very high densities of introduced suckermouth catfish such as Manoa and
| Photo by Ronald Englund and David Preston