Wetenschap - 16 februari 1995

Tropical Reservoir Fishery

Tropical Reservoir Fishery

Dutchman Jos Pet conducted his PhD research in Sri Lanka, examining the Tilapia fish species introduced to a fresh water reservoir in the 1950's. The result of his research is the thesis, On the management of A Tropical Reservoir Fishery. As his co-supervisor Prof. Huisman of Fish Culture and Fisheries explains, The coupling of this information on habitat occupation with the information on incremental growth rates, provides an excellent basis for comparing the different species which occupy a reservoir. It is then possible to create a management approach, enabling the exploitation of one particular fish type without damaging the stocks of other fish in the same reservoir. This selectivity could be done through alterations to equipment, such as increasing or decreasing the net mesh size." Prof. Huisman is enthusiastic, Jos Pet's research is an important contribution to models in fisheries, because it takes into account both the ecological habitat and popul
ation dynamics."

Masters graduate Wim van Densen, who was also involved in the research, believes that Pet's research has contributed significantly to earlier work on the same species, and indicates clearly how proper data collection can give insight into the ecological position of particular species in a given environment. As humans alter river systems, more reservoirs will be created and it will become increasingly important to obtain a clear understanding of the kinds of pressures which different species can sustain, at any particular time in their life cycle, or position in the reservoir. This is especially true in tropical areas, where inland fishery plays an important role in the provision protein for the local population.

Jos Pet returns from abroad a few days before defending his thesis on February 24th at 4.00 pm in the Aula, General Foulkesweg 1a. Interested members of the public are welcome to attend.