APA Review of ESA Fishery Rules: Substantial Evidence and Notice-and-Comment Limits on Post‑Hoc Data

1. Introduction

This appeal arises from a long-running regulatory effort by the National Marine Fisheries Service (NMFS) to reduce incidental “takes” of threatened and endangered sea turtles in shrimp-trawl fisheries under the Endangered Species Act (ESA). In 2019, NMFS issued a final rule requiring all skimmer-trawl vessels 40 feet and longer—inshore and offshore—to use turtle-excluder devices (TEDs). The Louisiana Shrimp Association and three individual participants in the Louisiana shrimping industry challenged the rule under the Administrative Procedure Act (APA).

The district court granted summary judgment to the federal defendants (the Secretary of Commerce, NMFS, and the President in their official capacities), upheld the 2019 Rule, and denied plaintiffs’ summary-judgment motion. On appeal, plaintiffs pursued only their APA theory, arguing the 2019 Rule was arbitrary and capricious because NMFS allegedly (i) reversed policy without adequate explanation and evidentiary support, (ii) disregarded industry reliance interests, and (iii) failed to consider scientific data and public comments.

The Fifth Circuit affirmed, emphasizing (a) the evidentiary “substantial evidence” floor for agency factfinding, (b) deference to technical judgments “at the frontiers of science,” and (c) the procedural boundary that challengers generally cannot fault an agency for failing to consider data and alternatives they did not timely present during notice-and-comment.

2. Summary of the Opinion

The Fifth Circuit affirmed the district court’s summary judgment for defendants and upheld the 2019 Rule. Applying arbitrary-and-capricious review under 5 U.S.C. § 706(2)(A), the court held that NMFS:

• Articulated a rational connection between record facts and the regulatory choice to require TEDs for skimmer-trawl vessels 40 feet and longer;
• Supported key factual predicates with substantial evidence in the administrative record (including FEIS studies and enforcement/compliance information);
• Adequately considered costs, alternatives, and relevant factors—including economic impacts and claimed reliance interests;
• Was not required to obtain or consider post-hoc Louisiana data or a geographic exemption request raised years after the final rule;
• Provided responses sufficient under the APA to the significant comments actually presented, and did not have to further engage with a thin Mississippi comment.

3. Analysis

3.1 Precedents Cited (and How They Shape the Decision)

3.2 Legal Reasoning

A. The APA Framework Applied: “Rational Connection” + “Substantial Evidence”

The court organizes the review around familiar APA axes: whether NMFS offered a reasoned explanation linking evidence to the chosen regulatory line, and whether that explanation is supported by “substantial evidence” in the administrative record. The panel repeatedly returns to two limiting principles:

• No reweighing: Under Villa v. Sullivan, the court will not redo the scientific/policy balancing.
• Technical deference: Under Balt. Gas & Elec. Co. v. Nat. Res. Def. Council, Inc., predictions about biological mortality and conservation effects receive heightened deference.

B. Substantial Evidence for NMFS’s Two Key Factual Predicates

Although NMFS offered multiple reasons for the 40-foot skimmer-trawl cutoff, the plaintiffs meaningfully contested two. The court held both were adequately supported:

• Improved TED feasibility/effectiveness post-2013: NMFS relied on the FEIS and a 2012–2016 study showing that three-inch bar spacing reduced bycatch for skimmer-trawl vessels by 17%. The panel held a “reasonable mind” could accept that evidence as adequate under Worldcall Interconnect, Inc. v. Fed. Commc'ns Comm'n.
• Tow-time restrictions are inadequate: NMFS supported this with observer data estimating “dozens to thousands” of captures/mortalities, and with the 2016 Stacy Report and 2017 Procedural Directive indicating delayed/persistent effects leading to post-interaction mortality, even where turtles appear healthy upon release. The panel treated these as precisely the type of expert synthesis and prediction entitled to deference under Balt. Gas and Medina Cnty. Env't Action Ass'n v. Surface Transp. Bd..

Additionally, the agency buttressed the enforcement inadequacy of tow-time restrictions with evidence of widespread noncompliance (e.g., low observed compliance rates) and the practical difficulty of monitoring unbiased fishing operations. That combination—biological risk + compliance/enforcement constraints—provided a rational basis for preferring TEDs over tow-time restrictions for larger skimmer-trawl vessels.

C. Plaintiffs’ “Population Growth” Counterargument and the Court’s Response

Plaintiffs emphasized that sea-turtle populations have increased since 1987 even without universal TED mandates for skimmer-trawl vessels. The court labeled this framing misleading because the agency’s objective is recovery (delisting), not merely population improvement. The FEIS’s statement that the rule is “unlikely to result in the recovery of Kemp's ridley sea turtles” in the foreseeable future, but still expected to reduce mortalities, was sufficient for reasoned decisionmaking. The court treated plaintiffs’ argument as an invitation to reweigh the record, which Villa forbids.

D. Costs, Alternatives, and “Relevant Factors”: Why the Panel Found No Clear Error

The panel highlights NMFS’s consideration of seven alternatives (from no action to broad TED mandates), and its quantification of:

• TED costs (purchase, installation, maintenance, replacement),
• expected shrimp revenue loss (including the cited estimated 6.21% reduced harvest per tow), and
• number of affected vessels.

The court also notes how NMFS narrowed the final rule in response to comments—reducing affected fishers by 82% and the total economic effect by 73% while projecting conservation benefits of 801–1,168 sea turtles annually.

E. Reliance Interests: Narrowing What Counts, and Showing Consideration

The plaintiffs’ reliance argument failed for two separate reasons:

1. Reasonableness/legitimacy of reliance: Citing Smiley v. Citibank (S.D.), N.A. and Mozilla Corp. v. FCC, the panel doubted that the industry could claim stable expectations where NMFS had repeatedly proposed expanding TED requirements over decades (including a 2012 proposal directly signaling possible extension to skimmer-trawl vessels).
2. Even if reliance existed, it was considered and reasonably addressed: Relying on Dep't of Homeland Sec. v. Regents of Univ. of Cal., Encino Motorcars, LLC v. Navarro, and FDA v. Wages & White Lion Invs., LLC, the panel held NMFS’s economic analyses and narrowing of the final rule reflected adequate consideration of industry impacts. The court further invoked Texas v. United States to stress that plaintiffs largely identified “costs,” not reliance interests in the stricter sense.

F. “Best Scientific and Commercial Data Available” Does Not Require Chasing Late-Submitted State Data

Invoking Shrimpers & Fishermen of RGV v. U.S. Army Corps of Eng'rs, the court stressed that stakeholders must timely submit their evidence and alternatives during rulemaking. Because Louisiana’s “long-running bycatch study” and geographic-exemption request were not submitted during the comment period—and were instead raised in a May 2021 letter (two years after the final rule)—NMFS was not arbitrary for failing to incorporate them.

The court also relied on Louisiana ex rel. Guste v. Verity to exclude extra-record evidence from judicial review, effectively preventing plaintiffs from using litigation to introduce new scientific materials that the agency never had the opportunity to evaluate.

G. Public Comments: Distinguishing “Significant” Challenges from Thin Objections

Using Chamber of Com. of U.S. v. SEC and Huawei Techs. USA, Inc. v. FCC, the court applied a “significance” filter:

• Mississippi’s comment: The panel deemed it underdeveloped (a two-page resolution with a single uncited statistic) and not necessarily contradictory given the agency’s point that strandings represent only a fraction of mortality. NMFS did not need to engage further.
• Louisiana Shrimp Association’s comment: The court found NMFS did engage substantively by discussing post-interaction mortality and citing the 2016 Stacy Report, the FEIS, and the 2017 Procedural Directive—i.e., the very materials explaining and operationalizing NMFS’s mortality criteria.

3.3 Impact

A. Practical Impact on ESA-Driven Fishery Regulation

The decision strengthens NMFS’s litigation posture when defending gear-based conservation rules under the ESA and APA, particularly where the agency:

• documents iterative technological development (here, post-2013 TED configurations),
• supports enforcement feasibility concerns with compliance data, and
• quantifies economic impacts and considers alternatives in an EIS/FEIS.

B. Procedural Impact: Participation and the Administrative Record

A key operational takeaway is procedural: challengers cannot reliably argue that the agency failed to use the “best” science when they withheld critical data during notice-and-comment and attempt to introduce it later. The panel’s reliance on Shrimpers & Fishermen of RGV and Louisiana ex rel. Guste v. Verity reinforces that the record is built during rulemaking, not in court.

C. Reliance Interests in a World of Repeated Proposals

The opinion signals a restrictive view of reliance where an agency has long telegraphed potential regulatory change through proposals and ongoing litigation. Expect future regulated parties to face headwinds claiming “decades-long stability” when the historical record reflects repeated reconsideration of the same issue.

D. The Unpublished Caveat

The opinion is “not designated for publication” (5th Cir. R. 47.5). While it may have limited precedential force, its reasoning is still informative about how this panel applies Fifth Circuit arbitrary-and-capricious doctrine to ESA-based technical rules.

4. Complex Concepts Simplified

• “Arbitrary and capricious” (APA): A court asks whether the agency explained itself rationally based on the evidence, considered the important aspects of the problem, and did not contradict the record or rely on irrelevant factors.
• “Substantial evidence”: Not “more likely than not,” but enough relevant evidence that a reasonable person could accept it. If substantial evidence supports the agency, courts do not reweigh competing evidence.
• “Best scientific and commercial data available” (ESA): Agencies must use the best data that is available to them through the process; the phrase does not necessarily obligate an agency to discover or obtain data that stakeholders did not timely submit, especially when review is confined to the administrative record.
• “Reliance interests”: The real-world expectations and investments built around an existing policy. Courts may require agencies to acknowledge and consider them when changing course, but reliance is weaker when regulated parties were on notice that change was likely.
• Notice-and-comment significance: Agencies must respond to “significant” comments—those that challenge a fundamental premise or would require changing the rule if accepted. Thin, unsupported objections may not require extended discussion.
• TEDs and tow-time restrictions: TEDs are escape devices installed in trawl nets. Tow-time restrictions limit how long nets can be dragged before checking—an approach NMFS found both less protective (due to post-interaction mortality) and hard to enforce.

5. Conclusion

LA Shrimp Association v. Lutnick affirms NMFS’s 2019 TED requirement for skimmer-trawl vessels 40 feet and longer, holding that the agency’s rulemaking survived APA arbitrary-and-capricious review because it was grounded in record evidence, reflected reasoned cost-benefit and alternatives analysis, and appropriately addressed reliance and comment obligations. The opinion’s most durable lessons are procedural and evidentiary: (1) regulated parties must timely present scientific data and alternatives during notice-and-comment, and (2) courts will defer to agency technical judgments when supported by substantial evidence and explained with a rational connection to the chosen regulatory line.