118 



Abstract— Larval development of the 

 sidestriped shrimp ^Pandalopsis dis- 

 par) is described from larvae reared 

 in the laboratory. The species has five 

 zoeal stages and one postlarval stage. 

 Complete larval morphological charac- 

 teristics of the species are described and 

 compared with those of related species 

 of the genus. The number of setae on 

 the margin of the telson in the first and 

 second stages is variable: 11+12, 12+12, 

 or 11+11. Of these, 11+12 pairs are most 

 common. The present study confirms 

 that what was termed the fifth stage 

 in the original study done by Berkeley 

 in 1930 was the sixth stage and that 

 the fifth stage in the Berkeley's study 

 is comparable to the sixth stage that 

 is described in the present study. The 

 sixth stage has a segmented inner fla- 

 gellum of the antennule and fully devel- 

 oped pleopods with setae. The ability to 

 distinguish larval stages of P. dispar 

 from larval stages of other plankton can 

 be important for studies of the effect of 

 climate change on marine communities 

 in the Northeast Pacific and for marine 

 resource management strategies. 



Larval development of the sidestriped shrimp 

 (.Pandalopsis dispar Rathbun) 

 (Crustacea, Decapoda, Pandalidae) 

 reared in the laboratory 



Wongyu Park 



School of Fisheries and Ocean Sciences 

 University of Alaska Fairbanks 

 Juneau, Alaska, 99801-8677 

 E-mail address: wparkig'uaf edu 



R. Ian Perry 



Pacific Biological Station, 



Fisheries and Oceans 



Nanaimo, British Columbia, V9R 5K6, Canada 



Sung Yun Hong 



Department of Marine Biology 

 Pukyong National University 

 Pusan, 608-737, Korea 



Manuscipt approved for publication 

 23 June 2003 by Scientific Editor. 



Manuscript received 20 October 2003 

 at NMFS Scientific Publications Office. 



Fish. Bull. 102:118-126 (2004). 



Sixteen species of the genus Pandalop- 

 sis have been recognized in the South- 

 western Atlantic and North Pacific 

 Oceans (Komai, 1994; Jensen, 1998; 

 Hanamura et al., 2000). Most members 

 of the genus attain a large body size 

 and are valuable as commercial fishery 

 resources (Holthuis, 1980; Baba et al., 

 1986). In the North Pacific, P. dispar, 

 P. ampla, P. aleutica, P. longirostris, P. 

 lucidirimicola, and P. spinosior have 

 been reported. Of these, Pandalopsis 

 dispar is an important component of the 

 commercial shrimp fisheries along with 

 several species of the genus Pandalus. 

 Commercial landings of shrimp during 

 1999 totaled approximately 19 million 

 tonstPSMFC, 1999). 



Knowledge of the life histories of 

 these species, including the duration 

 and growth of their larvae, is important 

 for stock assessment and management. 

 However, remarkably little is known 

 about their early life histories because 

 most species of the genus live at con- 

 siderable depths. Of the 16 Pandalopsis 

 species, the larvae of only three species 

 have been described partly or com- 

 pletely from plankton samples or from 



larvae reared in the laboratory. The 

 larvae of Pandalopsis japonica were 

 described completely from specimens 

 reared in the laboratory by Komai 

 and Mizushima (1993). Kurata (1964) 

 described the first stage of P. cocci nata 

 from plankton samples and from larvae 

 hatched in the laboratory. Thatje and 

 Bacardit (2000) assumed that larvae of 

 P. ampla occurring in Argentine waters 

 were similar to those of P. dispar and 

 Pandalopsis coccinata. Berkeley ( 1930) 

 described four larval stages of P. dispar 

 based on samples collected in British 

 Columbia coastal waters. The first stage 

 was obtained from ovigerous females, 

 whereas the larvae of the other stages 

 were separated from plankton samples. 

 In addition, the stage described as the 

 fifth stage was not clearly defined. 



In this study, we describe the complete 

 series of larval stages of P. dispar using 

 specimens reared in the laboratory. 



Materials and methods 



Ovigerous females of Pandalopsis 

 dispar were collected on 25 March 



