EFFECTS OF CURRENT VELOCITY ON FILTRATION AND INGESTION RATE OF PEARL OYSTER (Pinctada maxima)
Abstract: Pinctada maxima is a
filter feeder organism obtaining food particles by filtration from water
suspension. Filtration and ingestion rate of a large number of benthic filter
feeders in a variety of coastal environment have been known influenced by
current velocity. The purposes of this study were to examine the effects of
current velocity on filtration and ingestion rate of pearl oyster P. maxima and
to determine the best current velocity. Randomized Block Design was used in
this experiment with four current treatments of 8, 16, 24, and 32 cm s-1. The
results of this experiment demonstrated that current velocity has a marked
effect on filtration rate of P. maxima and that this species follows the
general pattern of response observed for other bivalves. Different velocity
affected filtration and ingestion rate in pearl oyster P. maxima. It was
gradual decline in the suspension feeding with increasing velocity. Filtration
rate of bivalves with siphons facing into the current, were directly inhibited
by hydrodynamic effects on the functioning of the bivalves pump. At increasing
current velocity, pressures applied to the inhalant and exhalant aperture
facing into the flow would result in higher pressures than that of produced by
the ciliary pump, resulting in reduced filtration rate. The highest filtration
and ingestion rate in this experiment were obtained at velocity of 8 cm s-1
that achieved 3.409±0.485 l/h and 37.91±1.27 (x107) cells/h, respectively.
Keywords: pearl oyster
(Pinctada maxima); current velocity; filtration rate; ingestion rate
Author: Apri I. Supii, Dewi
Puji Lestari, Sudewi
Journal Code: jpperikanangg120037
