YANG ET AL.: CULTURE EXPERIMENTS OF LOLIGO OPALESCENS 



E' 



Figure 4.— Size relationship of hatchling Loligo opalescens and various food organisms fed squid for the first 30-d posthatching. A, 

 copepod Acartia tonsa; A', copepod Labidocera aestiva. B, hatchling Mysidopsis almyra; B', adult M. almyra. C, mysis stage of 

 Penaeus spp. D, adult Artemia salina. E, 1-d-old larva of red drum Sciaenops ocellatus, E', 13-d-old larva of S. ocellatus. 



dulus spp. competed with the squid for crustaceans 

 in the tank. Uneaten mullet (Mugilidae) accumulated 

 to form small schools, that the squid would not ap- 

 proach or feed upon as readily as fish that swam in- 

 dividually. Squid consumed 44% of the mullet even 

 though the amount fed was equal to amounts of 

 Poecilidae and Sciaenidae, which were consumed 

 more (72% and 68%, respectively). The food remains 



indicated that the squid ate only the flesh of fish, 

 leaving the head and vertebrae. 



Figure 7 gives the estimated daily group feeding 

 rate (L.O. 1981) based upon the daily biomass of 

 squid and the daily food consumption from day 108 

 to day 232. Daily group feeding rate averaged 14.9% 

 (range 4-29%). Squid biomass reached a maximum 

 on day 183 and continued high for 11 d before the 



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