Could it be that your "pesi" is actually a typo for "pesci"? Because one of the ways you can breed fish is in cages: "cage culture". See below.


Tonni in gabbia. L'ingrasso dei tonni e il caso di Cetara

Tonni in gabbia. L'ingrasso dei tonni e il caso di Cetara ... Baleari o il Tirreno meridionale e dare a questi grandi pesci la possibilità di moltiplicarsi. ...
http://www.greenpeace.org/italy/ufficiostampa/rapporti/tonni...

Allevamento dei tonni
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È il ranching dei tonni: i pesci vengono catturati, trasportati in siti presso le coste del Mediterraneo, chiusi in gabbia e messi all'ingrasso. ...
http://oceans.greenpeace.org/it/oceani/allevamento-tonni

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Cage Culture of Fish in the North Central Region Technical ...
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Cage culture of fish is. an intensive production method that allows ... Cage culture is an inexpensive method to. develop fish husbandry skills before ...
http://aquanic.org/publicat/usda_rac/tr/ncrac/tb110.pdf

[PDF]
What is Cage Culture?
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What is Cage Culture? Michael P. Masser*. Fish are raised commercially ... pass freely between the fish and the. pond. The origins of cage culture are a ...
http://aquanic.org/publicat/usda_rac/efs/srac/160fs.pdf

A CASE STUDY ON COMMERCIAL CAGE CULTURE OF FIN FISH IN PENANG
The majority of the fish cage culture farms operated on a commercial basis, a few of which received partial Government subsidy prior to 1982. ...
http://www.fao.org/docrep/field/003/ac065e/ac065e00.htm