Larviculture of the Zungaro jahu (Ihering, 1898)

January 21, 2022 Aqua & Marine Biology No Comments
  • JAÚ, an endangered species under laboratory
    conditions

Zungaro jahu (Ihering, 1898) is a fish threatened with extinction, according to the Red List
of the Ministry of the Environment and Legal Amazon. The objective of this work was to
propose a cultivation protocol for the jaú. In the laboratory, 54 larvae were cultured for 15
days. Six specimens of jaú were removed, with a survival rate of 11%. The estimated cost
of the experimental unit was USD 62.50. With improvement of the cultivation system, we
could achieve survival of 9 fingerlings, one for each experimental unit, at an average cost
of $ 1.78 per fingerling. The authors believe that the cultivation of the jaú can be overcome,
and they raise some hypotheses to justify the extinction in natural environments. Possible
causes include changes in natural systems such as climate change, fishing, predation of
juveniles by introduced species, diseases introduced, changes in food chains, limitation
or restriction of habitat area, physical changes in the environment (formation of lakes for
electricity generation), eutrophication or pollution from different sources. The development
of larviculture protocols for this species would be an important tool to prevent the extinction,
enabling at least its cultivation in the laboratory.

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