Genus - Moina

Moina

Small freshwater zooplankton now confirmed as distinguishable from the smaller unidentified daphniid population. Moina persist in the Freshwater Lake and appear more concentrated in sheltered Lakeshore vegetation.

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Identity & Origin +

Common Name: Moina
Scientific Name: Genus - Moina
Realm: Freshwater
Biome: Freshwater Lake
Introduction Method: Wild collected
Date First Introduced: May 01, 2026
Source / Origin: Wild-collected trail-pool sample, FL

Population Dynamics +

Current Estimated Population: Hundreds present in the Freshwater Lake, with higher concentrations observed in sheltered Lakeshore vegetation.
Population Status: Established
Carrying Capacity Status: Stable but constrained; population persists but has not expanded to the expected large open-water densities despite abundant suspended food.
Date Last Observed: May 21, 2026

Section Notes

On 2026-05-21, Moina were confidently distinguished from the newly observed smaller egg-bearing daphniid-like species. The Moina population appears stable and established, with hundreds in the Freshwater Lake but stronger concentrations in sheltered Lakeshore vegetation. They are commonly visible on glass in the morning, remain hidden during the day, and become more active at night. Some ecological factor appears to be limiting abundance despite available food.

Trophic Ecology +

Trophic Level: Primary Consumer
Feeding Niche / Method: Filter feeder / plankton grazer
Dietary Inputs: Suspended algae, phytoplankton, microbes, and fine organic particles
Known Predators: Ghost shrimp (zoea and adults), young crayfish, and other macro-invertebrate predators in the Freshwater Lake.

Section Notes

Trophic classification is Primary Consumer. Food-web role: Suspended-algae plankton grazer. Feeding method: Filter feeder / plankton grazer. Dietary inputs: Suspended algae, phytoplankton, microbes, and fine organic particles

Environmental Tolerances +

Temperature Range: Warm-temperate to Tropical (typically 68°F to 88°F / 20°C to 31°C)
pH Range: Standard Freshwater (typically pH 6.6 to 7.8)
Lighting Requirements: Low to Moderate (negatively phototactic during peak day; rises to surface/active in low light and night)
Flow / Aeration Preference: Low flow to Still water (requires calm water column)

Section Notes

Highly tolerant of poor water quality, low dissolved oxygen, and high organic loading. Resilient in warm, stagnant waters where other cladocerans like Daphnia magna would perish.

Life Cycle & Reproduction +

Expected Lifespan: 10–20 days
Reproductive Strategy: Parthenogenesis (asexual reproduction via identical clones under good conditions) and sexual reproduction (producing resting ephippia under environmental stress)
System Reproduction Status: Established/persistent; reproduction should not be inferred from the earlier tiny-daphniid correction alone.
Growth Rate: Extremely Fast (reaches maturity in 4–7 days, producing a brood of clones every 1.5–2 days)

Section Notes

Moina are now confirmed as a separate established population from the tiny egg-bearing daphniid-like species. Continue treating the 2026-05-01 tiny-individual observation as uncertain for Moina reproduction, while 2026-05-21 confirms Moina persistence and habitat preference.

Ecological Role & Symbiosis +

Ecological Role: Small freshwater zooplankton and potential prey source within the Freshwater Lake food web.
Symbiotic Relationships: Closely associated with shoreline vascular plants (like Ludwigia, dollarweed) that provide vital structural shelter from predators in calm littoral zones.
Microhabitat Preference: Sheltered habitats, especially dense Lakeshore vegetation. Present in Freshwater Lake open-water/glass zones, often visible shortly after lights turn on and more active at night; tends to remain hidden during the day.

Section Notes

Stable but limited plankton grazer and prey resource. Shelter preference suggests vegetation structure may mediate Moina persistence and predation exposure.

Freshwater

A wet edge habitat where water, roots, glass, mud, and plant cover let aquatic and terrestrial organisms overlap.

Freshwater

A still freshwater habitat where submerged plants, tiny grazers, shrimp, snails, and crayfish are rebuilding the lake's food web after fish pressure changed.

Moina

Visual Data Unavailable

Section Notes

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Biomes This Species Lives In

Lakeshore

Freshwater Lake

No Records Yet

Moina

Visual Data Unavailable

Biomes This Species Lives In

No Records Yet

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