Ecological Asessment In Semarang Coastal Area Based On Sediment Bioassay Approach Using Green Mussel Larvae
Abstract: Rapid developments
of industry and population growth have lead to ecological pressures on coastal
areas. Semarang as capital of Central Java and port city, has an environment
sensitivity which is important to be investigated. Sediment is an important
part in aquatic environment because acts as sink or source of pollutant and
could be used to assess coastal environment health. Three locations had been
studied, i.e. Tanjung Mas Port, estuaries of Banjirkanal Barat and Banjirkanal
Timur. These locations were compared to assess their health of sediment through
elutriate sediment toxicity test. Eighteen grams of sediment from each
locations were weighed and placed in 1 L Beaker glass. Eggs and sperm are taken from spawning of
adult green mussel in laboratory. Thirty
mL of sperm was added to the eggs and fertilized eggs were observed
microscopically. Fertilized eggs were exposure to elutriate water-sediment from
each location for 48 hour. Statistical analysis showed that there are
significantly different abnormalities larvae percentage of sites 5, 8 and 13.
The highest percentage of abnormality larvae occurred in Port Tanjung Mas,
followed by Banjirkanal Timur and Banjirkanal Barat. Lead concentrations in
sediments of coastal Semarang was ranged from 10.9 to 15.62 mg.kg-1, with an
average of 13.69 mg.kg-1. Lead concentration was decreased form Port,
Banjirkanal Timur and Banjirkanal, respectively. The abnormalities of green
mussel larva may related to lead contamination. It could be concluded that
sediment quality in Port area was very poor compare than other site.
Keywords: bioassay, green
mussel larvae, sediment, Semarang coastal area
Author: Rachma Puspitasari,
Triyoni Purbonegoro
Journal Code: jpperikanangg160071
