Industry Challenges Misinformation in Chesapeake Bay Menhaden Debate

REEDVILLE, VA — In an ongoing public discourse regarding the Atlantic menhaden fishery, Ocean Harvesters CEO Monty Deihl has issued a formal rebuttal to claims linking the commercial harvest of menhaden to declining osprey reproduction rates in the Chesapeake Bay. Deihl, alongside industry proponents, argues that recent academic work—specifically a 2026 study led by Dr. Bryan Watts—is being weaponized by environmental advocacy groups like the Chesapeake Bay Foundation to demand restrictive fishery policies, despite a lack of empirical evidence establishing a causal link between industrial purse-seine fishing and osprey food stress.

Central to the dispute is the “gauntlet theory,” which posits that large-scale fishing at the mouth of the Chesapeake Bay acts as an intercept, starving the upper Bay of necessary forage fish. Industry representatives reject this model, citing January 2026 economic and biological analyses which found no correlation between Virginia purse-seine activity and fluctuations in Maryland pound-net catch rates. Experts note that menhaden are highly migratory and their availability is influenced by a complex web of environmental variables—such as salinity, water temperature, and dissolved oxygen—rather than a static, linear flow that the gauntlet theory assumes.

The industry further highlights that osprey food stress is a multifaceted issue that cannot be attributed to a single prey species. Scientific records indicate that ospreys rely on a broad diet including striped bass, gizzard shad, catfish, and seatrout. With the ASMFC reporting that striped bass remains overfished and recreational sectors accounting for significant removal rates, industry leaders argue that researchers must examine the broader ecosystem. Deihl points out that the osprey population in the Chesapeake has actually shown remarkable growth over the last several decades, a period that encompassed much higher levels of menhaden harvesting than those currently permitted under modern, capped regulations.

Critics of the current research, including those behind the industry’s position, claim that the ongoing narrative against the fishery constitutes “advocacy dressed in scientific language.” They argue that authors are relying on coastwide juvenile indices as proxies for local abundance, a methodology that has been challenged by independent peer reviews in Frontiers in Marine Science. By failing to conduct site-specific, concurrent sampling of osprey nests and menhaden populations, opponents argue that current studies jump to policy-heavy conclusions without establishing the fundamental science needed to justify legislative or regulatory restrictions on a highly regulated, MSC-certified industry.

To resolve these uncertainties, the menhaden industry is advocating for a data-driven approach rather than one based on ideological assumptions. Through the Science Center for Marine Fisheries, members are partnering with institutions like the Virginia Institute of Marine Science (VIMS) to utilize $2 million in state-funded research initiatives. The goal of these collaborative efforts is to build a scientifically defensible, Bay-specific index that can accurately guide management decisions. Leaders emphasize that until such data is produced, proposing a “pause” on the fishery based on inferred causation risks destabilizing a sustainable industry for reasons unsupported by the official stock assessment.

Ultimately, Ocean Harvesters maintains its position that the Atlantic menhaden population remains healthy, noting that the Atlantic States Marine Fisheries Commission (ASMFC) currently classifies the stock as neither overfished nor experiencing overfishing. The industry position is that the burden of proof must remain on those calling for economic disruption. By separating ecological sentiment from established regulatory and biological data, stakeholders hope to foster a more transparent dialogue that prioritizes ecosystem health through robust, objective scientific discovery rather than the cycle of blame that has characterized the current debate.