However, useful scientific research and information on the biology and stock assessments of tropical eels are lacking, a situation quite different from that for other temperate freshwater eels, which have been well studied for several decades with trends and recruitment patterns being on record. In this study, I attempt to examine the present status of the biology and stock of tropical eels. Therefore, commercial eel industries are now considering tropical eels as possible replacement for European and Japanese eels to compensate for declining stocks. One of the reasons for the drastic decline in eel populations is overfishing, which has caused a high demand for eel aquaculture eel aquaculture completely depends on wild juveniles, and in contrast to animals, artificial propagation has not yet succeeded for the eels. Therefore, the European eel was recently categorised as critically endangered by the European Union and the United Nations. European, American and Japanese eel populations now are considered to be outside the safe biological limits and are seriously threatened with extinction. Freshwater eels are important animals because they have a unique catadromous life history and are used as food resources.
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