Echinodorus grisebachii
One of three submerged macrophytes in miniBIOTA's Freshwater Lake, Amazon Sword grows broad lance-shaped leaves from a substrate-anchored rosette, providing vertical structure and biofilm-coated surface area for snails, amphipods, and small invertebrates.
Amazon Sword grew in Freshwater Lake as substrate-rooted rosettes with broad lance-shaped leaves, providing structure and surfaces for snails, amphipods and other small invertebrates. Two original individuals are documented; the first was reported dead by January 18, 2026, and the remaining plant's fate is unresolved. The species-level identification within the genus Echinodorus is tentative: "Amazon sword" is a trade name applied to multiple related species, and no voucher has been taken to confirm which one is present.
Echinodorus is a genus of aquatic and semi-aquatic plants native to the Americas, distributed from the southern United States south through Central America and into South America, with the highest diversity in Brazil and the Amazon basin. Plants in this genus grow as rosettes from a central rhizome, producing long lance-shaped or oval leaves that are typically fully submerged in aquarium conditions. In the wild, water level fluctuations may expose leaves emergently, at which point the plant can flower and produce elongated flower stalks with adventitious plantlets.
In the aquarium trade, Amazon sword species are among the most widely used freshwater plants: their large, visible leaves provide structural habitat for fish and invertebrates, and their substrate-rooted growth anchors the plant while drawing nutrients from both the sediment and the water column. Growth is generally moderate; adequate light and substrate nutrition are the primary requirements.
Reproduction in aquarium conditions occurs mainly through runners: long stalks produced from the rhizome bear adventitious plantlets at intervals, which root when they contact substrate. Vegetative propagation through rhizome division is also possible. Seed production from submerged plants is rare; flowers typically require emergent conditions.
In Freshwater Lake, Amazon Sword has supplied submerged structure alongside Tapegrass and Strap-leaf Sagittaria. Its broad leaves provide vertical surface area above the substrate for biofilm colonization, which is grazed by Seminole Ramshorn Snails, Bladder Snails, and Freshwater Amphipods. The leaves and root zone provide refuge for small invertebrates including Ghost Shrimp and microcrustaceans.
Amazon Sword competes with Tapegrass, suspended algae, and other macrophytes for light and dissolved nutrients in the water column. Its large-leaf profile provides greater shading per plant than the ribbon-leaf Tapegrass, potentially contributing to light competition dynamics in the Freshwater Lake.
Slough Crayfish is the primary macroinvertebrate in the Freshwater Lake and is a known plant consumer: crayfish grazing on Tapegrass was confirmed May 24, 2026. Whether Amazon Sword leaves are grazed by the crayfish has not been directly observed.
January 18 to 24, 2026: The first of two long-standing Amazon Swords was torn up and dead by January 18 after willow removal. Crayfish damage was suspected, but the cause was not established. An Amazon Sword remained present January 24. The two original plants did not both survive.
Introduction: The two original plants grew in Freshwater Lake alongside Tapegrass and Strap-leaf Sagittaria. Their arrival date and source are unknown.
The first of two long-standing plants was torn up and dead by January 18, 2026 after willow removal; crayfish damage was suspected, but the cause was not established. An Amazon Sword remained present January 24. On June 28, twelve detached leaves raised concern about the remaining plant, but opaque water concealed its base and left its survival uncertain.
Primary Producer. Fixes light into plant biomass through photosynthesis in the Freshwater Lake. Broad leaves provide biofilm-colonized surface area grazed by snails (Seminole Ramshorn, Bladder) and amphipods. Roots draw nutrients from the substrate while the leaves compete with suspended algae for light in the water column. Slough Crayfish is a potential plant consumer in the lake but no direct grazing on Amazon Sword has been recorded.
Widely adaptable freshwater macrophyte from the American tropics; grows well in a range of temperatures typical for tropical and subtropical freshwater aquaria. Requires moderate to high light and benefits from nutrient-rich substrate; can supplement nutrient uptake from the water column. Fully submerged growth is standard in aquarium conditions.
Rosette growth form; new leaves emerge from central rhizome; runner propagation is the primary aquarium reproduction mechanism; submerged plants rarely flower.
Submerged macrophyte providing structural habitat, biofilm substrate, and light competition dynamics in the Freshwater Lake
Follow this species across the habitats where it currently appears in the miniBIOTA biosphere.
