Copper Fish Cages Stand Up To Predator Attacks Without Biofouling
07 Sep 2016
Copper fish cage, Mozambezi Tilapia Farm – Cahora Bassa, Mozambique
Going on the attack
Imagine a crocodile viciously attacking a cage: not a scene from a horror movie, but a
daily reality for the Mozambezi Tilapia Farm in Mozambique. How can they protect the
fish in their cages from predators? Somewhat surprisingly, with copper!
Going up against predators
The fish farm had a major problem with predator attacks from crocodiles and otters.
The usual solution was to install additional predator nets to protect the holding nets
from damage. The holding nets were prone to intense biofouling, affecting the health of
fish and their mortality. The nets also had to be cleaned weekly after first removing the
fish – stress inducing for the fish and their two-legged care-providers alike.
Going for strong copper
Copper alloy aquaculture cages were installed at the fish farm – no additional predator
nets were required. The fish are protected from predators and the cages themselves are
resilient against attacks. Additionally, as copper has high resistance to biofouling,
the fish are healthier and their mortality rates much lower. Copper is a clear winner,
Going fierce on crocodiles
Tough enough to take on crocodiles – copper alloy cages come out on top compared to
traditional nets. With its high resistance to corrosion and biofouling, much easier
maintenance and sustainability, copper is in its element.