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One real constraint to expanding production from aquaculture is the lack of knowledge or information on the economic relationships between inputs and output, in other words between what goes into a pond and what comes out. In the case of Philippine milk-fish farming, the inputs include everything from seed (fry or fingerlings) to farm labor, feed, fertilizers, pond maintenance and repairs, rental and pesticides.
Ideally, all countries with major marine and/or inland capture fisheries should have a few scientists specialized in stock assessment techniques to lead research programs and to analyze the results for management and development purposes. An aim of both FAO and ICLARM is to establish such a well-trained core of staff in each country, who can then teach others in their neighborhood, through national courses or by participating in working parties for the assessment of specific stocks.