We evaluated the e‹ciency of feeding moon jellyˆsh Aurelia sp. to red sea bream Pagrus major by conducting nutritional and behavioral analyses. Four treatments were prepared in our 108-day feeding trial as follows: starved (S), fed only jellyˆsh (J), fed only pellets (P), and fed both jellyˆsh and pellets (JP). Juveniles consumed jellyˆsh as much as 5.3 and 1.3 times their own body weight per day in the J and JP treatments, respectively.Although there were no major contributions to the growth by feeding jellyˆsh,ˆsh in the J treatment showed better survival, daily growth rate or condition factor than those in the S treatment. Fish in the JP treatments showed a signiˆcantly higher rate of exhibiting tilting (anti-predator) behavior than those in the P treatment. The latency to start tilting after the transference was signiˆcantly shorter, whereas the latency to start swimming was signiˆcant longer in the JP treatment than in the P treatment. We recommend the utilization of jellyˆsh as subsidiary prey for juvenileˆsh for stock enhancement.

We conducted a 30-day feeding experiment on threadsailˆleˆsh Stephanolepis cirrhifer to evaluate the e‹cacy of giant jellyˆsh Nemopilema nomurai on the growth and body composition of theˆleˆsh. Four treatments were prepared: starved (control, S), fed only jellyˆsh (J), fed only pellets (control, P), and fed both jellyˆsh and pellets (JP). Threadsailˆleˆsh consumed the giant jellyˆsh as much as 5.6 and 4.1 times their own body weight per day in the J and JP treatments, respectively. Fish in the S treatment had 68 mortality, whereas the J treatment had no mortality. Fish in the JP treatments showed signiˆcantly faster growth than those in the P treatment. The giant jellyˆsh contained a high ratio of n-6 highly unsaturated fatty acids, especially arachidonic acid as well as free amino acids, especially taurine. The high contents of these acids re‰ected those ofˆsh body composition. These

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