A composite thread cable for an aquaculture cage includes multiple multi-filament polyester fiber yarn wires and at least one or more than one copper alloy wire blending and interweaving with the multi-filament polyester fiber yarn wires. Each of the multi-filament polyester fiber yarn wires is made of flexible material. The at least one or more than one copper alloy wire is made of hard material. The at least one or more than one copper alloy wire is intertwined in the multi-filament polyester fiber yarn wires tightly and closely to construct the composite thread cable.
