50 CFR § 660.413 - Overfished species rebuilding plans.

---
identifier: "/us/cfr/t50/s660.413"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "50 CFR § 660.413 - Overfished species rebuilding plans."
title_number: 50
title_name: "Wildlife and Fisheries"
section_number: "660.413"
section_name: "Overfished species rebuilding plans."
chapter_name: "FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE"
part_number: "660"
part_name: "FISHERIES OFF WEST COAST STATES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "16 U.S.C. 1801  16 U.S.C. 773  and 16 U.S.C. 7001"
regulatory_source: "61 FR 34572, July 2, 1996, unless otherwise noted."
cfr_part: "660"
---


# 660.413 Overfished species rebuilding plans.

For each overfished salmon stock with an approved rebuilding plan, annual management measures will be established using the standards in this section, specifically the target date for rebuilding the stock to its maximum sustainable yield (MSY) level (generally expressed as S<sub>MSY</sub>) and the harvest control rule to be used to rebuild the stock.

(a) *Klamath River Fall-run Chinook Salmon (KRFC).* KRFC was declared overfished in 2018. The target year for rebuilding the KRFC stock is 2020. The harvest control rule during the rebuilding period for the KRFC stock is the *de minimis* control rule specified in the FMP and at § 660.410(c), which allows for limited fishing impacts when abundance falls below S<sub>MSY.</sub> The control rule describes maximum allowable exploitation rates at any given level of abundance. The control rule is presented in Figure 1 of subpart H of this part.

(1) The KRFC control rule uses reference points F<sub>ABC</sub> MSST, S<sub>MSY</sub>, and two levels of *de minimis* exploitation rates, F = 0.10 and F = 0.25. The maximum allowable exploitation rate, F, in a given year, depends on the pre-fishery ocean abundance in spawner equivalent units, N. At high abundance, the control rule caps the exploitation rate at F<sub>ABC;</sub> at moderate abundance, the control rule specifies an F that results in S<sub>MSY</sub> spawners; and at low abundance (*i.e.* when expected escapement is below S<sub>MSY</sub>), the control rule allows for *de minimis* exploitation rates with the abundance breakpoints defined as: A = MSST/2; B = (MSST + S<sub>MSY</sub>)/2; C = S<sub>MSY</sub>/(1—0.25); D = S<sub>MSY</sub>/(1—F<sub>ABC</sub>), as shown in Figure 1 of subpart H of this part. For N between 0 and A, F increases linearly from 0 at N = 0, to 0.10 at N = A. For N between A and MSST, F is equal to 0.10. For N between MSST and B, F increases linearly from 0.10 at N = MSST, to 0.25 at N = B. For N between B and C, F is equal to 0.25. For N between C and D, F is the value that results in S<sub>MSY</sub> spawners. For N greater than D, F is equal to F<sub>ABC.</sub>

(2) [Reserved]

(b) [Reserved]

[85 FR 75921, Nov. 27, 2020, as amended at 86 FR 9302, Feb. 12, 2021; 87 FR 25430, Apr. 29, 2022; 89 FR 35013, May 1, 2024; 90 FR 47630, Oct. 2, 2025]