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TPWD to publish petitioned proposal to allow enclosed dotted‑duckweed aquaculture with strict biosecurity and exclusion zones
Summary
TPWD will publish for public comment a petition to allow commercial production of dotted duckweed in enclosed, department‑permitted facilities under strict biosecurity (greenhouse containment, mandatory maceration of drainage, on‑site processing and exclusion zones).
Texas Parks and Wildlife staff presented a petition and draft rule language on Nov. 5 to allow commercial aquaculture of dotted duckweed (an exotic duckweed species currently listed as a controlled exotic aquatic plant in Texas) under strict, facility‑level biosecurity measures.
Michael Tennant (Regulations and Policy) reviewed the species' biology, uncertainty about invasive behavior (USFWS risk assessment classified risk as uncertain), and the petitioner's industry case: dotted duckweed produces high protein biomass and can be attractive for plant‑based foods and feed. Tennant said dotted duckweed has high climate suitability across most of Texas and that seeds can be drought tolerant and survive dry…
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