Produktitvitas Diatom Perifitik yang Ditumbuhkan pada tipe Subtrat Berbeda Sebagai Alternatif Penyediaan Pakan Alami Udang

Abstract

ABSTRACT
The Productivity of Periphytic Diatom Grown on Different Types of Substrates as
an Alternative on Providing Natural Feed for shrimp. Providing natural feed is an
attempt to support fisheries culture in a polite way for the sustainability of environment.
Periphytic community is living aquatic resources that have a potential value for this
purpose. The major component of saline water periphytic community is diatom.
The study was emphasized on diatom presentation grown on two types of artificial
substrates: biocrete (sand, palm fiber, cement) and zeocrete (zeolite, palm fiber, cement).
The reseach was conducted in laboratory with an experimen design follows split split
plot in times. The aim of the research is to study the ecological factor and available
nutrients to support the growth of periphitic diatoms (Amphora, Cyclotella, Melosira,
Navicula, Phaeodactylum, and Thallassiosira) on two different substrates. The
productivity of diatom, and the effect of shrimp larvae on the diatom productivity were
also analyzed. Two fertilized materials (biocrete and zeocrete) with two main treatments
and three levels of treatments each, and unfertilized materials were used as artificial
substrates for periphitic diatoms. The results show that all treatment could give sufficient
biological available nutrient for the diatoms. The highest diatom productivity was achieved
by the population on third level ratio of fertilized biocrete and zeocrete (added by fertilized
with N:P ratio of 30:l). Diatom productivity follows the shrimp larvae grazing. The
shrimp larvae could grow well on the media with diatom that were grown on fertilized
biocrete.
Key words: periphytic diatoms, natural feed, biocrete, zeocrete, productivity