Department of Biology
King's College
London, U.K.

Intensive exploitation of fish stocks in the Amazon basin has exhausted the supply of large fish and has led to increasing pressure being placed on smaller fish, such as the jaraqui. But there is an urgent need for coordinated management if yields are to be sustainable. A closed spawning season and protection during the subsequent weeks when the fish feed in the flooded forests is vital together with further protection of these feeding areas from timber removal. M.C.L.B. Ribeiro, M. Petrere, "Fisheries ecology and management of the jaraqui (Semaprochilodus taeniurus, S. insignis) in central Amazonia," Regulated Rivers: Research and Management, 5, 195-215, August 1990. (Reserva Ecologia de IBGE, Brasilia, Departmento de Ecologia, Rio Clara, Brazil)

It is puzzling that Lake Chad, despite being a closed basin in a hot arid climatic region, is relatively free of salt. There must be...

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