"An interpretation of the stranding is presented with reference to historical reports of squid strandings worldwide."
って書いてありますから、イカの座礁現象は、世界中で過去にも見られてるんじゃないでしょうか?
"Evidence suggests some periodicity in the cycle of squid strandings, which may reflect temporal shifts in frontal zones that alter the behaviour, range and environment of foraging squid populations."
"Monterey Bay witnessed Dosidicus in 2002, when a warm-water anomaly off southern Baja California was followed by a wave of mass strandings that swept northward from La Jolla to Mendocino. Local strandings were modest, but 2003 brought another wave and more media attention."