The Yarkon Beam is usually up to 120 millimeters long. The bream tends
to swim close to the riverbed in oxygen-rich areas, where it feeds on algae.
The Yarkon bream is endemic to Israel and, until about 50 years ago, was
common in its river system. When a severe drought caused the Yarkon to dry up
and nearly drove the bream to extinction, the bream was taken to an aquarium
in an attempt to save it from that fate by providing it with optimal living
conditions. However, the attempt was unsuccessful, as the bream would not
breed. In a second attempt, an experimental breeding pool was built for the
bream in the Yarkon Sources National Park. Living on the brink of extinction,
being removed from its habitat and then reintroduced to it was a deeply
harrowing experience for the bream. Not only does the near-extinct species
face daily threats from predators and other dangers, it also grapples with
post-traumatic stress, anxiety and fear of what is to come. The bream developed
a strong preference for self-reliant survival strategies. It builds hiding
places that provide protection and ensure optimal breeding conditions. Now it
lays its eggs between stone structures it builds in the river — sanctuaries
and places of refuge for its body and mind in the dangerous Yarkon.
Physically, its forehead has thickened, and it uses it to push and stack
stones.
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