The eldest of the fishermen, Memo, rubs his grizzled chin in somber recollection, for one of our students has just asked a pointed and painful question: Which species have disappeared in his lifetime?-- Aaron E Hirsh, who argues that a system of “individual transferable quota”, or “fish shares”, is can offer a path to more sustainable fisheries in many places.
Solemnly, as though he’s reciting the names of his own deceased ancestors, Memo begins: the sea cucumbers, the fan clam, the lion’s paw scallop . . . . He’s working his way back in time, I think, moving from the most recently vanished toward the creatures that disappeared when he was a child.
In the early ’90s, he reaches the sharks; in the ’70s, the sea turtles; in the ’60s, the giant sea bass; and in the years of his childhood, the great totoaba, a six-foot croaker that was once pulled from these waters by the million.
 See also Saenz-Arroyo, A, et al. 2005. Rapidly shifting environmental baselines among fishers of the Gulf of California. Proceedings of the Royal Society B. DOI: 10.1098/rspb.2005.3175.