FA-65572 / Ecological population dynamics / Member archive

Schaefer surplus-production harvest reference points: status boundary · case 02

Fishing exactly at E_msy is labelled overfished.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

MSY = rK/4 at B=K/2 and E_msy = r/(2q); equilibrium biomass under effort E is K(1-qE/r) when qE<r else 0; yield = qEB; status 'overfished' when E>E_msy, 'at-msy' when equal, else 'sustainable'; return [MSY, Bmsy, Emsy, B, yield, status] rounded; None for invalid inputs.

Why this case matters

Population projections set harvest quotas, conservation status and pest-control timing; a wrong update order, boundary or rate conversion silently changes management advice.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: effort at msy	`[250.0, 1000.0, 250.0, 1000.0, 250.0, "overfished"]`	`[250.0, 1000.0, 250.0, 1000.0, 250.0, "at-msy"]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.