IMPACT OF HEAVY METAL TO FISH AQUACULTURE IN FLOATING NET CAGE IN CIRATA RESERVOIR, INDONESIA
Abstract: Utilization of
Cirata Reservoir for fisheries aquaculture with floating net cage system has
been increasing rapidly. Industrial waste existed along watershed brings
significant heavy metal pollutant that flows and difficult to control.
Consequences of such activities were reflected in the degradation of reservoir
environment indicated by sedimentation, water quality degradation and fish mass
mortality because of up welling. The objectives of this research were: 1) to
obtain data and information on heavy metal content in Cirata Reservoir waters,
and 2) to observe and understand the effect of heavy metal to the fish cultured
in floating net cage to support aquaculture in floating net cage system. Water
quality and fish histology analyses were the methodologies used in this
research. Descriptive and laboratory analysis were carry out to analysis the
data. Based on observation and descriptive analyses, the content of heavy metal
in Cirata Reservoir was classified as worse. Concentration of Pb, Cr, Hg, and
Cd in the sample of water and tilapia digestive organ becomes fragile.
Infiltration of hemoglobin cell, necrosis, degeneration and pigmentation
occurred in body organs when up welling happened. Beside that, during
up-welling digestive organ become easily breakable resulted in fish mass
mortality in floating net cage. The affinity of hemoglobin to the toxic gas was
higher than to oxygen, therefore aeration was not affective and mass mortality
cannot be avoided. This was because of various events that occured to the fish
and the other water biota that encompassed regular diffusion,
bio-magnification, and bio-concentration to fish.
Keywords: floating net cages;
heavy metal; fish mortality
Author: Tri Heru Prihadi,
Murniyati, Idil Ardi
Journal Code: jpperikanangg080008
