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Less leaf periphyton did not mean cleaner water everywhere
The evidence library is allowed to change in public. This page preserves the revised boundary, why it moved and which guides were affected.
What changed
The algae guide now includes a 119-day mesocosm comparison in which shrimp tanks had lower leaf-periphyton chlorophyll and faster Vallisneria growth, but higher water-column chlorophyll, total nitrogen and total phosphorus.
Why it changed
Four mesocosms per treatment separated shrimp presence from a no-shrimp comparison, but one plant species, one shrimp density, naturally varying temperature and mixed endpoints do not create a named-algae clearance rate, stocking formula, nutrient-export claim or restoration instruction.
Sources reviewed for this change
Affected practical guides
A public change is not automatically a retraction. A source may be added, a scope narrowed, a gap refined or an error corrected. The current guide and registry record own the current wording.
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