PRELIMINARY STUDY ON POPULATION DYNAMIC OF HARPACTICOID COPEPOD Euterpina acutifrons IN CULTURE CONDITION
Abstract: The most important
factor to high mortality rate in larval rearing is feeding success in early
larval stage related to kind and size of natural live food. Copepod basically
is the main source of natural food in the open ocean having some advantages
such as smaller size of nauplii, attractive movement and high nutritional value.
Observation on population dynamic of harpacticoid copepod Euterpina acutifrons
was carried out using 5-L plastic bucket with initial density 100 ind./L. Green
algae Nannochloropsis sp. was added to culture media at density of 50,000
cells/mL as a basic feed and additional feeds given were wheat flour (group A)
and chicken liver (group B) at a rate of 50 mg/bucket. The result showed that
there was no difference on population pattern in both groups where the
incubation time took eight days to hatch, from nauplii to the copepodite stage
was three days and from copepodite to adult copepod took five-to-six days. The
differences came up from population number: in group (A) the highest number of
copepod-bearing-egg was only 133 ind., nauplii production up to 62,833 ind. and
number of copepodites was 22,333 ind. lower compared to group (B) with the
highest copepod-egg was 308 ind., nauplii was 113,333 ind. and copepodite was
51,167 ind. The conclusion pointed out that the kind of food did not influence
population pattern (quality) but gave effect to population growth.
Keywords: harpacticoid
copepod; Euterpina acutifrons; population dynamic
Author: Philip Teguh Imanto,
Gede S. Sumiarsa, Made Suastika
Journal Code: jpperikanangg070022
