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Bruce Vondracek 



Wildlife and Fisheries Biology 

 University of California 

 Davis, CA 95616 



LABORATORY REARING OF 



THE SQUID LOLIGO PEALEI TO 



THE JUVENILE STAGE: GROWTH 



COMPARISONS WITH FISHERY DATA 



The common squid of the Northwest Atlantic, Loligo 

 pealei Lesueur, 1821, is a valuable species that is 

 exploited not only as a food for human consumption, 

 but as an important research model in biomedicine 

 (especially for the giant axon). Summers (1983) 

 reviewed much of the ecological and fisheries liter- 

 ature in his description of the life cycle of L. pealei. 

 There is an important gap in our knowledge of feed- 

 ing, growth, and behavior during the early phases 

 of the life cycle. In 1980, we reported the first data 

 from young L. pealei reared to 40 d posthatching 

 (Yang et al. 1980). We now present additional data 

 on squid reared from hatching to 6 mo and compare 

 existing laboratory growth data with estimates from 

 fisheries data. 



Materials and Methods 



The squid were reared in closed system aquaria 

 in artificial seawater (Instant Oceani). All details of 

 system design and rearing techniques can be found 

 in Yang et al. (1983, 1986). Wild-collected egg 

 strands and laboratory-spawned eggs were obtained 

 from the Marine Biological Laboratory in Woods 

 Hole, MA and air shipped to Galveston, TX on 27 

 August 1985. Transit time was 30 h and the eggs 

 were shipped in natural seawater (33 ppt). Upon ar- 

 rival the water temperature was 16°C, pH 7.5, and 

 NH4-N 1.52 mg/L. The eggs were acclimated im- 

 mediately and placed in a 1,600 L circular culture 

 tank (CT) for incubation and early rearing. The ma- 

 jor hatch occurred on 9 September 1985, and on 11 

 September (day 1 of the experiment) the spent egg 

 capsules were removed. During this 14-d incubation 



1 Reference to trade names does not imply endorsement by the 

 National Marine Fisheries Service, NOAA. 



FISHERY BULLETIN; VOL. 85, NO. 1, 1987. 



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