The City Council of Madrid is undertaking works on the Lake of the Casa de Campo that include the emptying and elimination of 14 thousand fish by means of electric discharges. Such animal sacrifice is justified because the fauna of this pond is composed of exotic species, such as carps and gambusias, that if they ended up in the Manzanares River, they would aggravate the ecological problem that the invading animals already suppose in the Iberian ecosystems. However, the way to handle this problem is compromised.

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