The origins of this volume date back to the 1978 American Society of Limnology and Oceanography (ASLO) meetings in Victoria, British Columbia. Interest in the ecology of mysids, particularly Mysis relieta. was growing rapidly, so a meeting of active workers was held at the ASLO conference. Although the small group of researchers attending that first meeting were primarily North American and interested in Mysis relieta. the group quickly expanded to include researchers from every continent with interests in all aspects of mysid biology (see Appendix). The group, informally called the Mysid Research Group, formed to serve two basic functions·. The first was to facilitate communication among mysid researchers by publishing a member­ ship list and periodic newsletters. The second was to organize an international symposium on mysid ecology. After several false starts, a symposium was successfully held in conjunction with the 1981 ASLO meetings in Milwaukee, Wisconsin. The symposium lasted over parts of two days with an evening workshop the second day. Altogether, 1 poster and 21 oral presentations were given by 42 researchers. This volume is an outgrowth of that symposium and includes 15 of the papers originally presented at the conference. In order to make the volume as comprehensive as possible, contributions from individuals who could not attend the symposium were solicited. Thus, a total of 22 original contributions make up the present work.

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Autecology of the cryptic mysid crustacean, Heteromysis formosa, S. I. Smith 1873, in a temperature estuary.- Key to the adult shallow water Mysidacea of the Texas coast with notes on their ecology.- Salinity and temperature tolerance of the juvenile Mesopodopsis orientalis: laboratory studies.- Abundance and life history of Neomysis intermedia Czerniawsky in Lake Kasumigaura.- Production, population biology and diet of Neomysis integer (Leach) in a shallow Frisian lake (The Netherlands).- Vertical migration of Mysis relicta Lovén.- Size dependent horizontal migration of Mysis relicta.- Size-frequency estimates of secondary production by Mysis relicta in Lakes Michigan and Huron.- Preliminary results of an experimental study of the effects of mysid predation on estuarine zooplankton community structure.- The predation of mysids by fish of the Rockall Trough, northeastern Atlantic Ocean.- Feeding habits of Mysis relicta - an overview.- Measuring in situ predation by Mysis relicta and observations on underdispersed microdistributions of zooplankton.- In situ predatory behavior of Mysis relicta in Lake Michigan.- The effect of prey composition and abundance on the predation rate and selectivity of Mysis relicta.- Excretion of total phosphorus, dissolved reactive phosphorus, ammonia, and urea by Lake Michigan Mysis relicta.- The release of dissolved organic carbon as a result of diatom fragmentation during feeding by Mysis relicta.- Influence of experimental conditions on nitrogenous excretion by Lake Michigan Mysis relicta (Lovén): laboratory studies with animals acclimated in Fragilaria.- Mysids in toxicity testing - a review.- The use of life-tables for evaluating the chronic toxicity of pollutants to Mysidopsis bahia.- Measurement of chronic toxicity using the opossum shrimp Mysidopsis bahia.- Chronic effects of cadmium on two species of mysid shrimp: Mysidopsis bahia and Mysidopsis bigelowi.- PCBs and other toxicants in Mysis relicta.- Appendix: Mysid Research Group - 1982.- Keyword index.