Because at the Battery, apparently, yesterday is when all the biggest fish are caught.

WSJ: You Can't Get Seasick on a Park Bench

When all the seaweed-eating fish in an area are removed, for example, the seaweed can take over completely, reducing coral cover and thus the diversity of bottom-dwelling organisms.

ECONOMIST: What price coral?

But it is widely accepted by scientists studying the crayfish invasion that this all started when an Egyptian businessman attempted to expand his fish farm industry by investing in shrimp.

CNN: Egypt's crayfish invasion

Just seeing a photo of Positano will make anyone who has ever visited long for the days when all there was to do was swim, have some freshly-caught grilled fish, and wash it down with an ice-cold limoncello.

FORBES: Daily Travel Flashback: Positano, Italy