 The bigfin reef squid is a neritic warm water @-@ dwelling squid . They are usually found 0 to 100 m ( 0 to 328 ft ) below the water 's surface . They tend to remain close to the shoreline , near rocks and reefs . They are slightly more active during the night and will move to deeper waters or find cover in daytime . Large numbers of juveniles can often be found hiding beneath floating driftwood . 
