Identification and Description of Shrimp Larvae 



Harry L. Cook 



Studies of the distribution, abundance, and biology of the larvae of 

 commercially important shrimps depend upon the facility with which the var- 

 ious species and their developmental stages can be differentiated. Initiated in 

 1959, efforts to rear and describe the larval stages of common penaeids con- 

 tinued during the past year. 



Rearing trials Gravid females of five species were captured periodically 



and held in the laboratory for the purpose of securing viable spawn. Larvae 

 hatched from eggs and reared to the stages indicated were obtained for the 

 following species: 



1. Xiphopeneus krfl^yeri (seabob) - Larvae reared through Nauplius 

 IV; resulting specimens of Nauplius III and IV supplemented descriptive mate- 

 rial obtained from a spawn in 1959. 



2. Sicyonia brevirostris - Larvae reared to Protozoea I; most of 

 the specimens preserved were in poor condition (broken setae or badly entan- 

 gled in detritus) and could not be used for descriptive purposes. 



i i I J 



Nauplius I of Sicyonia brevirostris Stimpson, ventral view. 



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