IV-E-33 



Simmons, M.A., R.M. Sitts, J.T. Allen, and A.W. Knight. 1974. The nomen- 

 clature for Mysids in the Sacramento-San Joaquin delta estuary. 

 California Fish and Game 60(l):23-25. 



Several mysids ( Neomysis spp.) are found in brackish and fresh waters 

 from Monterey Bay north along the western coast of North America. One 

 particular mysid, the opossum shrimp, is important as a food item in 

 the diet of young-of-the-year striped bass ( Morone saxatilis ) in the 

 Sacramento-San Joaquin Delta Estuary System. The description and dis- 

 cussion which follow a brief introduction present historic and taxonomic 

 evidence for transferring the mysid form found in this estuary system 

 from Neomysis arvatochensis (Brandt) to N eomy s i s in te rmed i a (Czerniavsky) 

 (L.H.) 



Keywords: mysids, opossum shrimp, estuarine systems, California 



IV-E-34 



Tabb, D.C. 1966. The estuary as a habitat for spotted sea trout, Cynoscion 



nebulosus . Pages 59-67 jjl American Fisheries Society, A symposium 



on estuarine fisheries. Washington, D.C. 



The spotted seatrout, Cynoscion nebulosus (Cuvier), is one of the 

 most valuable fish of the southeastern United States. In several 

 states spotted seatrout are harvested in about equal quantities by 

 sport and commercial fishermen. Both young and adults are tolerant 

 of the normal environmental extremes of estuaries, which are too 

 rigorous for most marine fishes. This enables the spotted seatrout 

 to reproduce and grow almost unhindered by predation and competition. 



Spotted seatrout populations of more northern estuaries apparently 

 make seaward movements to escape winter cold. Southern populations 

 do not exhibit a strong offshore movement. They are nearly nonmigratory 

 in Florida, and tagging studies show that they seldom move more than 

 30 miles. Since most of the favored estuarine areas are separated by 

 long stretches of exposed seashore, there is little exchange of stocks 

 between estuary systems. The nonmigratory character of the species, 

 when combined with differences in habitat, has resulted in spotted 

 seatrout populations having different growth rates. 



Unfavorable conditions for feeding or spawning in any given estuary, 

 which cause declines in abundance, are likely to be felt for long 

 periods since the region will not likely receive large numbers of 

 immigrants from other estuaries. Destruction of the estuarine habitat 

 will have an immediate and direct effect on the abundance of the 

 spotted seatrout, and reversal of such effects will be slow. 



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