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Like a fish in water
The request was clear. Identify the problems in two fish farms, and attempt to offer solutions. After inspecting the ponds in Pakistan, it did not take long for PUM expert Arie de Bondt to identify the problem.
'Water in which the fish feel at home'
Arie de Bondt previously was in charge of his own business in Kwintsheul, HESY Aquaculture, a company that has built fish-farming installations in more than 27 countries. Now, his sons have taken over the business from him.
Arie: “Fish suffer stress if provided with lower quality food at the wrong time, and they also suffer from a lack of oxygen. Their response is to rise to the surface to take in air. That costs energy and that in turn limits their growth, and at the end of the day the yield for the fish farm. The number one requirement is water in which the fish feel at home.”
Between June and August, the water temperature in the ponds was a problem. This caused a lack of oxygen, leading to uncontrollable gas formation. By bringing in water in advance, and ensuring a continuous supply of spring water, or by moving fish around, you can avoid these oxygen shortages.
Make sure there is enough fresh air; make sure the water is clean; make sure the water temperature is not too high; ensure sufficient fresh water in the dry hot months. All would seem to be obvious recommendations. In Pakistan, the biggest problem seems to be adopting a new mind set. The owner seemed to have some awareness of this problem and thanks to the visit by our expert, was motivated to tackle his business in a truly professional manner. If he succeeds, this will be a major step forwards for both him and his employees.