On the Evolutionary History of Billfish

The Old Narrative When I travel to the Rosenstiel School of Marine and Atmospheric Science, I traverse the Rickenbacker Bridge which overlooks Biscayne Bay. Miami, like much of South Florida, is a haven for large game fish like marlins, mackerel, and tuna. Or, at least, it once was. Conservationists and fishermen alike have collaborated to… Read More

Off Topic: How Rent Works in Fisheries

In economics, the term “rent” is often confused with economic profit. Profit (π) can be measured over the short-term or the long run. In the short term, profit is equal to total revenues minus total costs of production (π=TR-TC). Over the long run, marginal costs accumulate and matter more than short-term profits. This applies to… Read More

On the Golden Age of Sharks

When the Golden Age of Fishes ended 359 million years ago, more than 75% of Earth’s species were eliminated. The Devonian Period, as it was also known, was over. As life rebounded, a new era of abundance—the Carboniferous Period—had begun. On land, the world’s first rainforests emerged. Early clubmosses, conifers, and cycads—some more than 100… Read More

On the Sharks of the Devonian

“The Golden Age of Fishes” is known for, among many things, its incredible ichthyologic diversity. As life on land began its own rapid radiation of terrestrial forms, including the earliest ferns and the insects that ate them, marine ecosystems flourished below the ocean’s surface. Between 416 and 359 million years ago, the Devonian Period saw… Read More